Click Here



Post New Topic  Post A Reply
my profile | register | search | faq | forum home
  next oldest topic   next newest topic
»  :[ Q3Arena.com Message Board ]:   » The Lounge   » Question for photography geniuses

UBBFriend: Email this page to someone!    
Author Topic: Question for photography geniuses
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-23-2006 04:23 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
I have a camera lens that is 18-55mm. How dos that translate to zoom? I did some reading on google and the formula seems to be MAX / MIN = zoom. In other words 55/18 = 3x zoom. That doesn't quite jive to me because that would mean a 100-300mm lens is also 3x but that can't be right. I must have missed something. Anybody care to explain this to me?

The reason for asking is that I want to get a new lens for being able to take closer shots. I don't mean a macro lens, I mean that I want to be able to zoom into shit further away. Understanding that basics will obviously help. I have $250 to spend. From other reading I've done that will only get me a "cheap" lens but I guess it's all relative. Photography is not a hobby of mine but I like to take nice shots when I am away. I have a Canon EOS Digital Rebel if that makes any difference.

Cheers, Max

[ 01-23-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
Cacophonous
Sarge
Member # 19

Member Rated:

posted 01-23-2006 06:41 PM     Profile for Cacophonous   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Max you have it right. The "3x" in "3x optical zoom" is just the ratio between the longest and shortest focal lengths the zoom offers

A focal length of 34-102 mm, gives it a zoom range of 3X, as 34 mm multiplied by 3 equals 102 mm.

--------------------

...


Posts: 5571 | From: Yes | Registered: Jun 1999  |  IP: Logged
Cacophonous
Sarge
Member # 19

Member Rated:

posted 01-23-2006 06:50 PM     Profile for Cacophonous   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
A 28-135mm may be a good choice. Maybe Xan, Crash or Acidwarp can suggest one.

--------------------

...


Posts: 5571 | From: Yes | Registered: Jun 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-23-2006 06:56 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
So what's the difference between a 18-55 and a 100-300 which both equate to 3x zoom?

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-23-2006 07:14 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Cac stated it correctly. Saying something is 3x optical zoom is bullshit.

Knowing it's a DReb helps a LOT. I would recommend a Sigma 70-300mm F4-5.6 Macro Super 2. It's a very inexpensive lense and gives more than acceptable results. It blows the equivlant canon lens away.

1 thing to consider, particularly with a Digital SLR is that 9 times out of 10 the sensor is smaller than an actual film frame. In short, this means that there is a built-in magnification of your focal length (this isn't exactly how it works, but it's the effective result). You don't notice this because the viewfinder on Digital SLR's is designed to show the actual pixel dimensions of the sensor. This means that the viewfinder is still wysywyg like a Normal SLR. I only mention this because for any lens you purchase, your camera has a built-in teleconverter (telextender). A 70-300mm lens on the DReb translates to a 112-480mm lens, for no extra charge.

The above is only to illustrate a point, what it means is that you get extra zoom for no extra money. You won't ever have to adjust for the crop factor because it's built in to the viewfinder.

To answer your first question, you have to look at focal length, and not the zoom ratio. There is a rough conversion for focal length vs apparent distance from the subject (how far away the subject appears to be in the shot) but I can't remember it offhand. It's something like 300.mm for 2.00metres apparent (for your backwards non-standard american units it's about 76.2inches (30cm) for an apparent 6.50ft)

sigh. . . I've been doing sig-figs all day. . .

[ 01-23-2006: Message edited by: AcidWarp ]

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-23-2006 07:29 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Thanks guys. I will check out that lens AW.

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-23-2006 07:33 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Here are some photos I took with the lens I mentioned.

Max, I also found a better way to convert to apparent distance. On a 35mm SLR, the "normal" focal length is 50mm this is because it closely approximates what the human eye sees. So a 300mm lens is 6x the magnification of a 50mm lens. Take that 6x and divide it into the actual distance to subject (most decent lense have a focus distance readout, or you can just approximate it). That will give you a very rough estimate as to how far away the subject will appear to be in the shot. Works for feet or metres.

[ 01-23-2006: Message edited by: AcidWarp ]

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Cacophonous
Sarge
Member # 19

Member Rated:

posted 01-23-2006 07:46 PM     Profile for Cacophonous   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Max - I think AW answered this for you but the 100-300mm lens, which is still a 3X lens, starts out at 100mm where the 18-55mm starts at only 18mm. A fixed 300mm lens is only 1x.

--------------------

...


Posts: 5571 | From: Yes | Registered: Jun 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-23-2006 07:47 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Thanks again, AW. I checked out the lens you said and ordered it off Amazon.

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-23-2006 07:48 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
quote:
Originally posted by Cacophonous:
Max - I think AW answered this for you but the 100-300mm lens, which is still a 3X lens, starts out at 100mm where the 18-55mm starts at only 18mm. A fixed 300mm lens is only 1x.

What I REALLY need to do is read a dummies book for photography to understand what all the number mean. I'm typically point and shoot which my camera allows me to do but there is so much more I can do. I will get to that all in good time though.

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-23-2006 08:10 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
A good place to start, read the camera manual. Canon (and I'm sure Nikon et al) does an exellent job of explaining the functions of the camera and how they affect picture taking.

After that, www.photo.net. More tutorials than you'll ever need. Also there are some good books. There's a guide by a guy named John Shaw (his writing strikes me as arrogant, but it is very informative, and the techniques are clearly explained)

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-23-2006 10:25 PM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Hey Max: I'm jumping in here kind of late, but everything Cac and AW said was correct. You get 1X of magnification for every 50mm.

Is this just a general purpose lens or is there something specific you want to shoot? A 300mm lens is plenty for most people, but if you're photographing birds or wildlife, it may not be enough. Or if you're shooting hockey in an arena, you may want a faster lens.

A good source of info for lenses specific to your camera would be the Canon Lens Forum at dpreview.com

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
mynameisxanthan
Sarge
Member # 3045

Rate Member

posted 01-24-2006 12:13 AM     Profile for mynameisxanthan   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
I think its already been said! So I can't add on to what Cac, AW, and Crash have said but Crash did post a great link. http://www.dpreview.com is a great camera resource website. I always check it when I want to learn more about photography. They have excellent reviews and pretty good forums full of knowledge-able people.

Hi Crash!


Posts: 1148 | From: in your pants | Registered: Jan 2004  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-24-2006 01:01 AM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
It's just for general photography, nothing specialized. I have a couple of pics from San Diego Zoo here. Even though I like the pics I think it would have been nice if I could have gotten closer. I have more pics than that by the way, I just haven't put them up yet. Zoos are a good example of the photos I want to take cuz you can only get so close. We have a big back yard and sometimes I like to shoot things back there.

Thanks, Guys.

[ 01-24-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-24-2006 03:28 AM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Based on what you've said Max, this lens should be right in your price range and serve you very well. It will allow you to get in nice & tight and let you blur the background so your eye is drawn to the main subject more like this.

With a longer lens though, you'll need to use a faster shutter speed than you used with the pandas, so you may need to bump up the ISO on your camera. (You can easily shoot with your camera set to 400; There won't be too much digital noise until you pass 800 ISO.) I'd also recommend shooting with the resolution/quality set to the largest, finest .jpg possible. <--- sorry, is this too much info?

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-24-2006 03:42 AM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Oh, hey Xan!

*tosses ring at Xan*
*after he "tosses" Xan's ring*

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-24-2006 09:27 AM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
quote:
Originally posted by crash:
Based on what you've said Max, this lens should be right in your price range and serve you very well. It will allow you to get in nice & tight and let you blur the background so your eye is drawn to the main subject more like this.

With a longer lens though, you'll need to use a faster shutter speed than you used with the pandas, so you may need to bump up the ISO on your camera. (You can easily shoot with your camera set to 400; There won't be too much digital noise until you pass 800 ISO.) I'd also recommend shooting with the resolution/quality set to the largest, finest .jpg possible. <--- sorry, is this too much info?


No, not too much info. I understand what you are saying. I always shoot at the highest quality JPG setting. The next step up would be to store photos in raw format but I don't think I need to do that yet.
BTW, how did you blur the background? Did you do it manually or use PS, etc.?

[ 01-24-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-24-2006 10:25 AM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
You blur the background by opening the aperature (increasing f-stop) decreasing depth of field (the distance range of that is in focus). Although, on zoom lenses at the maximum focal length it's a kind of non-issue because they tend to compress the depth of field as the move towards maximum length.
http://www.fredmiranda.com/reviews/showproduct.php?product=18&sort=7&cat=27&page=2showproduct.php?product=18&sort=7&cat=27&page=2

I want this one -> http://www.fredmiranda.com/reviews/showproduct.php?product=106&sort=7&cat=37&page=2

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-24-2006 10:31 AM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
quote:
Originally posted by AcidWarp:
[QB]You blur the background by opening the aperature (increasing f-stop) decreasing depth of field (the distance range of that is in focus). Although, on zoom lenses at the maximum focal length it's a kind of non-issue because they tend to compress the depth of field as the move towards maximum length.
http://www.fredmiranda.com/reviews/showproduc t.php?product=18&sort=7&cat=27&page=2showproduct.php?product=18&sort=7&cat=27&page=2

I want this one -> http://www.fredmiranda.com/reviews/showproduct.php?product=106&sort=7&cat=37&page=2[/ QB]



Sorry, AW. I wasn't clear. I meant how did crash blur the background of my photo.

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-24-2006 06:03 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Some gaussian blur and the smudge/blur tool? At anyrate, it's probably done in photoshop.

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-24-2006 06:53 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
quote:
Originally posted by AcidWarp:
Some gaussian blur and the smudge/blur tool? At anyrate, it's probably done in photoshop.

I have done that too in PaintShop Pro 5 (one of these days I will upgrade). I was just impressed with the handywork. If it was me the pandas and trees, etc. would be all a blur too.

EDIT: that baby panda's a cutie though, huh?

[ 01-24-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-25-2006 12:18 AM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
quote:
Originally posted by AcidWarp:
Some gaussian blur and the smudge/blur tool? At anyrate, it's probably done in photoshop.

Shit, dude knows his Photoshop. Yeah, first I selected out the background, which took friggin' forever. (I stupidly worked on the whole thing and then cropped it later.) I used gaussian blur for most of it. In the areas where I didn't do a good job of selecting, I tried the blur tool but found smudging worked better. (Not great but okay for this little demo.)

And yes, pandas are adorable to begin with, but the baby is uber-cute.

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-25-2006 12:33 AM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
AW ~ that 300-800 is fuggin' sick, dude. I doubt it would fit in my Volkswagen.

quote:
Originally posted by AcidWarp:
You blur the background by opening the aperature (increasing f-stop) decreasing depth of field.

I understand what you mean, but to be technical, you open or increase the aperture but you decrease the f-stop.

[edit] I just looked at the reviews that AW posted a link to. While I knew that Canon doesn't have a great lens in that range (price and focal length) I wasn't expecting it to get slammed so bad. A Tamron or Sigma might perform better for the money. I've seen a few Tamrons that appear pretty good but I've never thoroughly tested them.

[ 01-25-2006: Message edited by: crash ]

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-25-2006 12:50 AM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Heh, that's what I meant to say, but I was too damn lazy to fix it

The photoshop bit was just a shot in the dark. I only knew that it had been shopped in after I looked close and saw the pinpoints around some of the foreground objects.

Oh, and the 300-800 is because I like to shoot birds and other wildlife.

[ 01-25-2006: Message edited by: AcidWarp ]

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-28-2006 07:41 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Got the new lens today. Not done much with it other than snap a couple of shots in the back yard to compare old vs. new. Like it so far. Next purchase - tripod.

Thanks for the help, guy. MUCH appreciated.

[ 01-28-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-28-2006 08:00 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
It's what were here for

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
crash
Sarge
Member # 3015

Rate Member

posted 01-29-2006 06:07 AM     Profile for crash   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
What did you buy, Max?

--------------------


Posts: 86 | From: Victoria | Registered: Oct 2003  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 01-29-2006 11:10 AM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
I got a Sigma 70-300mm F4-5.6 APO DG Macro.

I don't know what all that means yet but I know I can take much closer shots.

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 01-29-2006 01:57 PM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Ah, that's the one that's one up from mine. Pretty good lens from what I remember.

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged
Mad Max
Sarge
Member # 622

Member Rated:

posted 02-02-2006 07:49 PM     Profile for Mad Max   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
I meant to post a photo that shows basically the same image but using the min / max zoom for both lenses. The pictures are nothing to write home about and I took them through our shitty kitchen window so don't bust my balls because they're crap.

Top Left - original lens, 18mm
Top Right - orginal lens, 55mm
Bottom Left - new lens, 70mm
Bottom Right - new lens, 300mm

Thanks again for the help.

[ 02-02-2006: Message edited by: Mad Max ]

--------------------

Miss you guys.


Posts: 1487 | From: | Registered: Aug 1999  |  IP: Logged
AcidWarp
Sarge
Member # 997

Member Rated:

posted 02-03-2006 01:11 AM     Profile for AcidWarp   Author's Homepage     Send New Private Message   Edit/Delete Post   Reply With Quote
Looks pretty good.

--------------------

“I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.”

“Intelligence is the ability to adapt to change.”

--Dr. Stephen Hawking.


Posts: 4363 | From: Waterloo, Ontario | Registered: Nov 1999  |  IP: Logged

All times are ET (US)  

Post New Topic  Post A Reply Close Topic    Move Topic    Delete Topic next oldest topic   next newest topic
Hop To:

Contact Us | Q3Arena.Com

Powered by Infopop Corporation
Ultimate Bulletin Board 6.04d