Re: IR- screw Leica rangefinder option? Don't know yet...

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 27 Aug 96 at 3:44, Robert Long wrote:

> On Mon, 26 Aug 1996 23:25:56 +0100,  "joe b." wrote:
>
> |This is partly inspired by a comment elsewhere from W-J about using a
> |Russar on an old Leica body. FWIW I recently got a rather nice but used
> |Leica IIIC which I like very much. I didn't get it specifically for IR
> |photography, but since it was only UKP 195.00 its IR potential may be of
> |interest, if it has any IR potential other than EIR, that is! In
> 
> Am I missing something here?  EIR--meaning Ektachrome IR, I
> assume--would not profit from an "opaque" (sorry, W-J, but you did use
> that term yourself!) red filter.  Its recommended filter is
> minus-blue--which looks similar to a medium yellow and thus can be
> seen and focused through very easily.  So why would a rangefinder
> Leica IIIc be particularly appropriate for this film, or it for the
> camera?

I guess Joe ment that since darkloading is near impossible, EI is 
the only sane alternative.
Btw 1: you can use opaque IR filters with EI, but you end up with an 
overall red image; red in those parts where HIE would be bright white 
when using the same filter.

Btw 2: the recommended minus-blue *is* an ordinary yellow filter,
Kodak recommends #12, but I wasted an entire film with it; I have
used a b&w orange #21 from Cokin, and was very satisfied with
results. Inbetween there is also a color #16. I am planning a largish
batch of custom cut filters for my Horizon 202 (small circular
discs), and right now I am gathering all kinds of different colors
in Cokin size; #12, 16 and 21 are already on the pile, waiting to be 
cut. The set up costs for such a cutting order are only justified 
with multiple discs from several colors.

 
> Or am I wrong about the filter?  I've only used IR Ektrachrome with
> the yellow, orange, and red filters, and my experience confirms what
> the Kodak instructions imply:  Using anything but the minus-blue
> simply limits, in one way or another, the color range of which the
> film is capable.  The "opaque" filters would, I should think, limit
> the range even more than the red (probably a Wratten 25) that I tried
> and decided never to bother with again.

I never bothered with darker colors either, but Guenter Spitzings 
book does have recommendations for those kind of 
experiments....
Actually, one of the more interesting and confusing chapters in this
book is related to flash photography and additive/subtractive
colors, just like those Cokin kits you can buy with a yellow lens
filter and a magenta flash filter. You get a neutral foreground, but
a yellow background.
Expand this to opaque filters, like an opaque one on the flash, and
a yellow one on the filter, and you can get red subjects nearby, and
'ordinary' false-color subjects at further away. Most color
combinations are impossible with ordinary film, hence your results
are unique!

You could do the same with HIE of course, but I doubt whether you
can see the difference. Perhaps only if you combine very different 
filters (87C on flash and orange on lens) and foliage in the 
foreground. Mmm....




--
Bye,

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The difference 
between men and boys
is the price of their toys

<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 18