Re: Focus corrected IR-filter (was: Another New Subscriber

[jdgoff@xxxxxxxx]

At 02:58 PM 12/8/96 +0000, you wrote:
>On  8 Dec 96 at 1:57, Steve Midgley wrote:
>
>>     My equipment ranges from 35mm to 8x10 but my favorite camera for
>> infrared is the twin lens Rollei - I can use the Rollei infrared filter
>> (which is focus corrected for IR) and still be able to see to compose and
>> focus. 
>
>I once bought such a Rollei focus-corrected filter, but I be damned 
>if I can see any effect other than color (color equals a Wratten #89B, 
>see the IR-filter list on my homepage).
>All tricks and methods to prove it is concave or convex in whatever 
>direction were in vain. And I do have the Rollei manual/instructions 
>that once again confirm the focus claim.
>Yet Rollei Germany is also baffled when I ask them about it, they say 
>such a focus corrected filter never existed....
>It *can* be made they said, but would be quite expensive.
>Would love to get more info on this!
>
>
I have a small booklet that was packed with the Rollei I purchased in 1952
that clearly described the IR filter as focus corrected. I have never seen
one, but have been on the look-out for one for the last year. I suspect they
would be expensive and rare. If affordable, this filter would help in one
way I use the Rollei with IR. I make panoramic photos using the Rollei Pan
head. It would be nice to frame/focus through the upper lens without the
bother of mounting/unmounting a filter for each shot in the series...James
>
>--
>Bye,
>
>       _/      _/       _/_/_/_/_/       _/_/_/_/_/
>     _/  _/  _/               _/       _/  _/  _/
>     _/  _/ illem    _/     _/ an    _/  _/  _/ arkerink
>                     _/_/_/  
>
>
>
>      The desire to understand 
>is sometimes far less intelligent than
>     the inability to understand
>
>
><w.j.markerink@xxxxx>
>[note: 'a-one' & 'en-el'!]
>


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Topic No. 13