Re: IR spherical panorama

["Russ Rosener" <rrosener@xxxxxxxxxx>]

Those spherical panoramas have inspired me to get out my Kiev 30mm fisheye
and give it a try in medium format. Unfortunately, the deepest filter is
orange, and not red. Any chance I could get an 87c filter cut to fit that
lens? ;)

Russ Rosener

----------
>From: "Willem-Jan Markerink" <w.j.markerink@xxxxx>
>To: infrared@xxxxx
>Subject: Re: IR spherical panorama
>Date: Sun, Oct 15, 2000, 5:45 PM
>

> On 16 Oct 00 at 8:44, Ben Kreunen wrote:
>
>>
>> >What brand/model of 8mm?
>> > > Film was Konica IR,
>> >
>> >Aha, mine was EIR, that makes comparing our shots a bit more
>> >difficult.
>> >What type of filter btw?
>>
>> Sigma, manual focus f4..  only a #25 (internal filter).
>
> I can make you both a #89B and #87C too, internal/circular foil
> filter, to be attached between the standard (UV) screw filter and the
> barrel....still have the cutting dies laying around....;))
> (the only practical use right now is for cutting polaroids....also
> recommended....:))
>
>> >(these circular fisheyes are *the* prime candidate for BTFR-filters
>> >(between the film rails), as one cannot attach filters to the front
>> >of the lens (and the rotatable filters inside on some models only
>> >offer #25 red at most, while internal screw filters (old Sigma) or
>> >rear slot filters are also a mediocre solution with darker IR filters
>> >(unless you commit yourself to a tripod).
>>
>> Not a great problem for me as these panoramas are usually shot on a tripod,
>> but I wouldn't go sticking an extra filter inside the lens.  a BTFR filter
>> would be useful though if I wanted to go for the extra IR effect. An opaque
>> filter in front of the lens wouldn't bother me either as I don't actually
>> need to look through the lens since I'm photographing everything.  I also
>> don't use the full 185° since there is plenty of overlap between the images
>> so a filter in front of the lens may be possible. Since this would screw
>> onto the lens shade it would also be practical for changing between bodies
>> but I'd have to test just how much cut off there would be.
>>
>> >Is the light fall off mathematically from center to edge, or does it
>> >depend on the direction of the sun?
>> >With circular fisheyes, flare gets a whole new meaning....8-))
>>
>> It's definitely radial and as there was no sun that wasn't the problem..
>> The software I'm using can compensate for it a bit but it wasn't as gentle
>> a fall off as normal lenses so the edges were still quite dark.  It was
>> noticeable on a single scan (oops, trashed everything so nothing to show)
>> and it's not obvious on your images. In the second panorama the nadir is
>> quite dark for example, due to all three images meeting at the edge at this
>> point.  I also shoot an image pointing straight down to patch any defects
>> in this area and this image was quite light.  It was easier to darken the
>> light image than to try and lighten the area it was slotting into.
>
> And you are sure this has nothing to do with the fact that you
> possible used the ring-shade? I always use the full angle, so I never left
> it on....
>
>> I've been quite impressed with the way the lens copes with lens flare and
>> it doesn't really produce anything that can't be corrected.
>
> My Kowa 19mm/f4.5 circular fisheye for 6x6 is heaps better....but
> that one is from a different era; 'quality and damn the
> cost/weight/size'....with camera attached (not the other way
> around!) it weighs 4kg....I guess I am one of the few blokes on
> earth who ever suffered muscle ache from a circular fisheye....8-))
> (the Nikon 6mm/f2.8 is not much more rare than this one....;))
>
> --
> Bye,
>
> Willem-Jan Markerink
>
>       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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