[rollei_list] Re: Fisheye Filters
- From: "John Wild" <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 11 Dec 2007 09:40:23 -0000
Thanks Tim, that's a good idea. I will have to search out gel filters
now but should be easier than Zeiss filters. ;-)
Best wishes
John
________________________________
From: rollei_list-bounce@xxxxxxxxxxxxx
[mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Ellestad
Sent: 10 December 2007 20:46
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: Fisheye Filters
There is room in the air space behind the supplied clear filter to drop
in a circular cut gelatin filter.
I have a gel filter kit that I used years ago on Angenieux cine zooms.
There was a filter holder that capped the protruding rear group barrel
on the tail-end of their zooms. Along with the supplied filter holders
and storage tube that was part of the kit there was another storage tube
for a stack of layered, circular cut gel filters and gel cutting tools
that consisted of a tweezers to handle the gels, a firm rubber pad to
cut the gels on, and a serrated circular punch die to pop the ideal
filter out a square gel filter. You could get about nine filters out of
a 3x3 inch gel I think. These punched out filters seem to be about ideal
in diameter for the space in the 30mm Distagon. I have assembled this
combination and things seem to fit but I haven't had time to shoot a
test yet. I am interested in this approach because there are numerous
filters - 81a, 85, Fl-A, etc. - that were never available in the
supplied glass filters.
I think that you could make a pattern to sandwich with paper and the gel
and cut satisfactory gel filters like this with a small scissors.
If there is an objectionable optical degredation in this it isn't
visible in the viewfinder.
If anyone tries this let me know how you liked the results.
Tim Ellestad
----- Original Message -----
From: aghalide@xxxxxxx
To: rollei_list@xxxxxxxxxxxxx
Sent: Monday, December 10, 2007 12:21 PM
Subject: [rollei_list] Re: Fisheye Filters
I can only guess it would be a problem. might be a problem you
cannot see. ed
-------------- Original message from "John Wild"
<JWild@xxxxxxxxxxxxxxxxxxxxxx>: --------------
........the world is still revolving then. ;-)
Thanks Ed.
Because the filter is part of the optical train, is the
filter thickness critical or is it just the number of glass/air
interfaces? I can machine a filter holder to insert the glass as opposed
to destroying a rare Carl Zeiss filter if thickness is not an issue.
John
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