| Author | Thread |
|
|
08/21/2006 09:50:06 AM · #1 |
Hey all,
Quick question, especially for any Olympus users out there. I came across the lens mentioned above and was looking for some guidance.
With the 2x crop factor on my camera with the kit lenses, would using an Olympus OM 50mm lens actually function as a 50mm lens, or is there some reverse crop or something, thus forcing the 50mm to behave as something more or less?
Also, I understand that using an OM lens (with adapter ring) would take away certain functionality such as autofocus and auto stopping down of the lens. I'd have to set everything manually, so when using a smaller aperture the scene would appear dark, making it a bit harder to compose/focus.
My question here is, should this be that much of a concern? I see this lens as appealing b/c of the speed, so wouldn't it be used most when I need the extra light and am shooting wide open anyway?
I'm still trying to understand what I should be looking for in lenses and what makes sense to try and acquire (if anything at this point). I've currently got the 14-45 and 40-150 kit lenses that came with my e500, but I've go an assortment of old Pentax M-mount (i think that's what it's called -- the screw thread) lenses from my father's old K1000.
Any comments would be appreciated...just looking for some direction.
-mike |
|
|
|
08/22/2006 09:07:06 AM · #2 |
| bump on this -- no takers it seems... |
|
|
|
08/22/2006 09:32:18 AM · #3 |
Your 50mm lens will have the coverage of a 100mm lens when you use it on your 2x crop camera; a good portrait length.
You are correct that when shooting wide open it will be relatively easy to use. If you want to shoot it stopped down, you'll want to use a tripod, because you won't be able to focus it very accurately when you stop it down. The correct approach would be to focus wide open then stop down before making the exposure.
Robt.
Message edited by author 2006-08-22 09:32:57.
|
|
|
|
08/22/2006 09:34:14 AM · #4 |
Originally posted by Bear_Music:
Your 50mm lens will have the coverage of a 100mm lens when you use it on your 2x crop camera; a good portrait length.
You are correct that when shooting wide open it will be relatively easy to use. If you want to shoot it stopped down, you'll want to use a tripod, because you won't be able to focus it very accurately when you stop it down. The correct approach would be to focus wide open then stop down before making the exposure.
Robt. |
Thanks Bear... So the crop factor is more to do with my camera, and not the lenses? So basically any lens I attach to the body will have the 2x crop?
|
|
|
|
08/22/2006 09:40:07 AM · #5 |
Originally posted by PSUlion01:
Thanks Bear... So the crop factor is more to do with my camera, and not the lenses? So basically any lens I attach to the body will have the 2x crop? |
That's correct. Any lens you mount is throwing an image circle big enough to cover a 35mm film, basically, and your camera is cropping down to the center of that image circle. On my 20D, with a 1.6 crop factor, the 50mm = an 80mm.
R.
|
|
|
|
08/22/2006 10:50:24 AM · #6 |
If you are going to be mounting legacy, 35mm lenses, then yes, you have to take into account the 2x crop factor in determining the 35mm equivalent FOV. However, the olympus 4/3rds system is a full frame system if used with the ZUIKO 4/3rds lenses that were designed for it. This means that the entire image circle is used by the sensor and as a result, there really is no cropping of the image circle by the sensor size with digital Zuiko Olympus lenses (like the kit lenses you already have). Because most people are used to thinking in 35mm terms you can apply a 2x crop factor in your head to determine a 35mm equivalent FOV and see if the lens you are using is wide angle, normal, or telephoto. For example, if you owned the 50mm f2.0 macro Zuiko, while no actual cropping of the image circle was taking place in the camera, you could say that in 35mm terms it was equivalent to a 100mm FOV (short telephoto). However, it's still the same 50mm lens and will show the same perspective distortions and DOF that a 50mm lens would normally have.
Bear in mind also that Zuiko 4/3rds lenses are built with much greater resolving power than 35mm legacy lenses because of the smaller pitch of the photodiodes used in its smaller sensor. As a result, if the legacy lens you are mounting is not designed with a high enough resolution, you will probably get soft images.
Here are some articles from Andrzej Wrotnaik's web site that may interest you. (His web site is highly recommended reading for all users of Oly cameras)
OM Zuiko 50mm 1.8 mounted on E-300
General info for mounting OM lenses on an E-system cameras
Using any 35mm lens on an E-system camera |
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2026 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 01/02/2026 11:46:59 PM EST.
