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Wide-angle distortion on a digital

 
 
Mike Graham
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      09-30-2003
When you put a 16mm lens (35mm equiv.) on a DSLR with a 1.5x factor it
acts like a 24mm lens. Fair enough. You would expect that lens to have
a bit of fish-eye distortion when coupled to a 35mm camera... do you get the
same distortion on a DSLR? Is it the worst of both worlds where you get the
distortion but don't get the wide angle?

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Mike Graham | Metalworker, rustic, part-time zealot.
mike 'at' metalmangler.com |
<http://www.metalmangler.com>| Caledon, Ontario, Canada

Lousy photographer with a really nice camera - Olympus C3020Zoom.
When that's broken I can use my Nikon D100
<http://www.metalmangler.com/photos/photos.htm>
<http://www.photo.net/shared/community-member?user_id=766040>
 
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Mxsmanic
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      09-30-2003
Mike Graham writes:

> You would expect that lens to have a bit of fish-eye
> distortion when coupled to a 35mm camera...


Good wide-angle lenses do not have fish-eye distortion unless they are
deliberately build that way.

> ... do you get the same distortion on a DSLR?


The type of image-capture device is unrelated to any distortion produced
by the lens, so you'll see the same lens defects on both digital and
film cameras, for any given lens.

> Is it the worst of both worlds where you get the
> distortion but don't get the wide angle?


Usually lens distortion is worst at the points in the frame furthest
from the optical axis. A small digital sensor uses less of the frame,
so it may exclude the most distorted parts of the projected image.
Thus, you get less wide angles, but you may also get less distortion.
Of course, some types of distortion are present throughout the frame,
and they will be just as obvious or invisible on digital as they would
be on film.

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Don Stauffer
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      09-30-2003
Because you are only using the central portion of the image, it will
have much less distortion than when on a full 35mm format.

Mike Graham wrote:
>
> When you put a 16mm lens (35mm equiv.) on a DSLR with a 1.5x factor it
> acts like a 24mm lens. Fair enough. You would expect that lens to have
> a bit of fish-eye distortion when coupled to a 35mm camera... do you get the
> same distortion on a DSLR? Is it the worst of both worlds where you get the
> distortion but don't get the wide angle?
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Mike Graham | Metalworker, rustic, part-time zealot.
> mike 'at' metalmangler.com |
> <http://www.metalmangler.com>| Caledon, Ontario, Canada
>
> Lousy photographer with a really nice camera - Olympus C3020Zoom.
> When that's broken I can use my Nikon D100
> <http://www.metalmangler.com/photos/photos.htm>
> <http://www.photo.net/shared/community-member?user_id=766040>


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Don Stauffer in Minnesota
http://www.velocityreviews.com/forums/(E-Mail Removed)
webpage- http://www.usfamily.net/web/stauffer
 
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Mike Graham
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      09-30-2003
In article <(E-Mail Removed)>, Don Stauffer wrote:

> Because you are only using the central portion of the image, it will
> have much less distortion than when on a full 35mm format.


Okay, so is it fair/safe to say that the perspective distortion etc. from,
say, a 10mm lens on my D100 with a 1.5x factor will be similar to a 15mm
lens on a 35mm film camera body?

--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Mike Graham | Metalworker, rustic, part-time zealot.
mike 'at' metalmangler.com |
<http://www.metalmangler.com>| Caledon, Ontario, Canada

Lousy photographer with a really nice camera - Olympus C3020Zoom.
When that's broken I can use my Nikon D100
<http://www.metalmangler.com/photos/photos.htm>
<http://www.photo.net/shared/community-member?user_id=766040>
 
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Don Stauffer
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      10-01-2003
I would guess it might be even a bit better. The 1.5 X would only apply
with very similar wide angle designs, AND the rate of distortion versus
field angle. Distortion is a bit harder to quantify as a function of
field angle compared to things like coma.

Mike Graham wrote:
>
> In article <(E-Mail Removed)>, Don Stauffer wrote:
>
> > Because you are only using the central portion of the image, it will
> > have much less distortion than when on a full 35mm format.

>
> Okay, so is it fair/safe to say that the perspective distortion etc. from,
> say, a 10mm lens on my D100 with a 1.5x factor will be similar to a 15mm
> lens on a 35mm film camera body?
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Mike Graham | Metalworker, rustic, part-time zealot.
> mike 'at' metalmangler.com |
> <http://www.metalmangler.com>| Caledon, Ontario, Canada
>
> Lousy photographer with a really nice camera - Olympus C3020Zoom.
> When that's broken I can use my Nikon D100
> <http://www.metalmangler.com/photos/photos.htm>
> <http://www.photo.net/shared/community-member?user_id=766040>


--
Don Stauffer in Minnesota
(E-Mail Removed)
webpage- http://www.usfamily.net/web/stauffer
 
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