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

["Steve Midgley" <smidgley@xxxxxxxxx>]

I will go down tomorrow and look through the inventory that was left when
the shop I managed went out of business. I am almost certain that there are
some Rollei IR filters there. While not quite rare, they are uncommon and
not cheap. As I recall, a mint condition Bay I IR filter with the little
leather case (and maybe the original box) sold for $40. Anyway, I'll see
what is there and post to the group, as others may be interested.

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> From: jdgoff@xxxxxxxx
> To: smidgley@xxxxxxxxx
> Subject: Re: Focus corrected IR-filter (was: Another New Subscriber
> Date: Sunday, December 08, 1996 11:35 AM
> 
> 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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End of INFRARED-PHOTOGRAPHY Digest 146
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