>>I just read a 10 year old post about using a G-Claron as a 'pseudo-
>>convertible' by using one cell; performance would probably be better
[quoted text clipped - 18 lines]
>
> Sorry, I've never tried it myself.
Ron Wisner recommends using a strong yellow filter (I imagine any
monochromatic filter would do as well) when using single cells of
his Convertible Plasmat set. This is to solve the problem of uncorrected
lateral color in a single cell. Now I do not use a #15 filter for that,
but I do use B&W filter 58ES MEDIUM YELLOW (022). Note that, when using
a single cell, the focal length tends to be quite long compared with
using a pair together.Of course, this would work only with black and
white film where blue light was not too important.
He presumably makes a corrector lens that has zero power but all the same
distortions so that it corrects a single cell. I ordered one when he first
announced it over 10 years ago, but he is yet to ship me one, so I cannot
say how well it works.

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murrayatuptowngallery - 23 Oct 2007 06:35 GMT
Thanks, all.
Yes, the notorious vaporware field corrector - I have even heard of
it's non-existence, at least in this plane...
Murray
Thor Lancelot Simon - 25 Oct 2007 12:54 GMT
>He presumably makes a corrector lens that has zero power but all the same
>distortions so that it corrects a single cell. I ordered one when he first
>announced it over 10 years ago, but he is yet to ship me one, so I cannot
>say how well it works.
Didn't he in fact run his company out of business by taking prepayments
and deposits for work that wasn't, in fact, ever done? I tried off and
on for several years to get a replacement back (graflok style) for my 4x5
trad and wondered why he wasn't responding to my inquiries but now I feel
lucky he didn't -- since I took the camera in to L&R for repairs a few
weeks ago and discovered there were no spare parts available (luckily
I didn't need any) I've talked to several other people who were persistent
enough to get in touch with Ron over the past few years and, if they ordered
anything, ended up wishing they hadn't...

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Thor Lancelot Simon tls@rek.tjls.com
"The inconsistency is startling, though admittedly, if consistency is to
be abandoned or transcended, there is no problem." - Noam Chomsky
Jean-David Beyer - 25 Oct 2007 15:47 GMT
>>He presumably makes a corrector lens that has zero power but all the same
>>distortions so that it corrects a single cell. I ordered one when he first
[quoted text clipped - 10 lines]
> enough to get in touch with Ron over the past few years and, if they ordered
> anything, ended up wishing they hadn't...
I have never been dissatisfied with the quality and workmanship of his
products. Most things were delivered promptly. The Convertible Plasmat
Set took a couple of years, though. But I definately got it and I use
it to the exclusion of everything else except the 90mm f/8 SuperAngulon.
The big problem was the corrector, and the problems were not entirely
his. After what I thought was too much delay, Ron offered to refund my
money, but I would rather have the lens than the money, so I have held
on. Now it seems he is trying to rectify this and is taking few or no
new orders until the backlog is taken care of. He also suggests he is
thinning out his product line to make things more manageable. This may
also reflect a drop in business due to the digital machines and bicycle
craze supplainting the photography sport.
I have _never_ had a question of his honesty.

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