re: Realist vignetting

[P3D Sam Smith <3dhacker@xxxxxxxxxxxxx>]

At 05:47 PM 9/10/97 -0500, you wrote:
>Bob Howard writes:
>
>> I often think the vignetting reported is from using round lens
>> shades and filters that with depth of field at f/16 image the shade!
>
>No, this is not the cause.  I don't use lens shades and still get
>vignetting.  If you take the back off the camera and look from the
>corner of the film plane into the lens, and then pass a pencil point
>in front of the lens, you can see that as the pencil point reaches the
>edge of the black ring in front of the lens you can see it from the
>back.  This says to me that the front lens ring is being included in the
>image and is therefore vignetting.


Well, I had to dust off my old Realist 3.5 to look for myself. I both agree
and disagree. Why? because the vignetting varies depending on where you
focus! At the minimum focus there is no noticable vignetting at f:22, but at
infinity, BINGO, there it is! Another silly design award for the Realist I
guess. It is possible to file the front of the barrels down about 1mm to
eliminate it. It seems ANY slip-on filter attached to the front would
vignette, so you wouldn't lose much by keeping it the way it is. Unless you
slip and file the lenses of course! Those weary better ward off the Hack Attack!


Sam


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