| Author | Thread |
|
|
03/26/2008 07:36:28 PM · #26 |
Originally posted by Patrick_R:
Yeah the front element is what I'm talking about. I just was wondering if it gained you some extra light coming through the glass so that you wouldn't need as low an f stop or something. |
For all lenses, the larger the maximum aperture (smaller f-stop) the larger the front element needs to be. For telephoto lenses *only*, the front element size will be slightly larger than the focal length divided by the max. aperture. For example, a 100mm f/2 lens needs a front element at least 100mm/2=50mm in diameter. That's the usable diameter of the glass... the filter size will be somewhat larger.
For wide angle lenses, there is no simple relationship like this for determining front element size. |
|
|
|
03/26/2008 08:13:07 PM · #27 |
| Well thank you guys! I'm learning a lot here. fast AND accurate auto focus is important to me as well since I hate getting a model in a great pose and some stupid branch deciding it needs to be in focus lol! |
|
|
|
03/26/2008 11:05:01 PM · #28 |
| Does Canon have one of those dual aperture lenses, like the (correct me if I'm wrong) Minolta STF lenses and the Nikon DC (Defocus Control) lenses? I hear those are fabulous... |
|
|
|
03/27/2008 09:26:02 AM · #29 |
Originally posted by Anti-Martyr:
Does Canon have one of those dual aperture lenses, like the (correct me if I'm wrong) Minolta STF lenses and the Nikon DC (Defocus Control) lenses? I hear those are fabulous... |
Nope. And it's a shame too. |
|
|
|
03/27/2008 09:38:28 AM · #30 |
Originally posted by Anti-Martyr:
Does Canon have one of those dual aperture lenses, like the (correct me if I'm wrong) Minolta STF lenses and the Nikon DC (Defocus Control) lenses? I hear those are fabulous... |
They have the 135 F2.8 Soft Focus lens. It has 3 settings - sharp (like any normal lens and it's a very sharp lens), 2 which is slightly soft focus and 3 which is very soft focus. You can also adjust the amount of SF by the aperture you use - the wider, the softer.
-----------------------------------------------------------
To the OP - canon makes three 50mm lenses -
1.8 ($70 and while better than the kit lens, it's only worth $70 for a reason)
1.4 around $300 and a very good lens
1.2 around $1200, an L, and excellent. for most shooting you won't see much difference between the 1.4 and 1.2 lenses, but the bokeh is different, and L lenses just have a quality about them that shows up in the final image. Hard to define, but you can see it if you put an L and non-L image beside eachother.
Canon makes two 85mm lenses and both are excellent. The 1.8 version is similar in build and quality to the 50 1.4 and runs around $350. Sharp wide open too. The 1.2 is the L lens and it's very large, very heavy and will just about make light. It's also around $1800.
On the wider end the 35 2.0 ($200 ish) I hear is good. I chose the 28 1.8 ($350 ish) because it has USM, and it's sharp wide open.
Most people look best when shot with a tele lens. How tele is up to you, but the #1 pro choice for individual ports is the 70-200 2.8 shot at 2.8. It's also probably the most popular sports lens too, unless you shoot primarily football where you need a longer lens, then get the 400 2.8 (instead of that new car :D)
The 24-70 2.8 is excellent also.
I've used the canon 28-135, tamron 24-135 and tamron 28-75 2.8 and all will work, but each has it's quirks and compromises. The plus is they're pretty inexpensive and versatile lenses.
Message edited by author 2008-03-27 09:39:17.
|
|
|
|
03/27/2008 09:53:16 AM · #31 |
Originally posted by Prof_Fate:
Originally posted by Anti-Martyr:
Does Canon have one of those dual aperture lenses, like the (correct me if I'm wrong) Minolta STF lenses and the Nikon DC (Defocus Control) lenses? I hear those are fabulous... |
They have the 135 F2.8 Soft Focus lens. It has 3 settings - sharp (like any normal lens and it's a very sharp lens), 2 which is slightly soft focus and 3 which is very soft focus. You can also adjust the amount of SF by the aperture you use - the wider, the softer.
-----------------------------------------------------------
|
The Nikon Defocus Control and Canon Soft Focus lenses are two completely different things.
The DC lenses let the photographer have a razor sharp subject while giving control over how the BG or FG blurs. The Soft Focus lenses give a soft focus effect to the whole image.
The DC lenses can also be used to create a soft focus effect, but use a different method that the Canon lenses.
Message edited by author 2008-03-27 09:57:22. |
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 08/02/2025 12:03:02 AM EDT.
