Gene,
Is there any chance you could slot the side of your lens barrel for
waterhouse stops? I know this is much easier said than done, but if the
front/rear iris is killing your coverage, it might be something to
consider. Depending on the f-stop range you normally use, you may not need
too many individual stops. ND filters might be used to fine tune exposure,
since they are available in 1/3 stop increments.
Leonard
At 02:22 PM 12/17/2001 -0800, you wrote:
>Hello All,
>
>Thanks for the excellent information. I thought I would share the
>results of a little experiment I just performed. I was very curious if
>the 12" lens without any iris would cover 4x5 at infinity and f16 with
>an external iris. I made a black paper f16 aperture and taped it to the
>rear of the lens. No way. Nowhere near enough coverage. Moved it to
>the front. Just covers, with a little to spare. I haven't done the
>experiments to determine the proper settings for my 6 inch with unmarked
>iris, but I will.
>
>Gene
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