Re: 87c vs. 25

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

On  9 Nov 96 at 22:41, Robert Fisher wrote:

> I'm new to infrared and I just spent $15 on a Tiffen #25 red filter.  Should
> I also get a #87c?  
> What is the approximate price of an 87c?  

Depends whether you want glass, gelatine or resin.
Only B+W and Heliopan still sell glass #87C equivalents (see my 
homepage for an overview of types and equivalents:
http://www.a1.nl/phomepag/markerink/mainpage.htm)
Hoya doesn't sell any glass IR filter anymore, if my updates are correct.
If you are interested in a resin solution for the Cokin-P system, 
check also this list on my homepage.

> Is there a big difference in overall effect?  

Yep, the unworldliness factor increases significantly, by recording 
only invisible IR.
Note that you end up with 12 ASA at most, so it might not be the best 
solution for all applications. Hand held wide angle photography is 
easy though. Related is the fact that you can't see anything through 
such an opaque #87C, so you either want a tripod, a rangefinder, or 
just take hit and miss for granted.
As for rangefinders, I am truely addicted to my Horizon 202 panorama 
camera. Makes wonderfull IR shots!
(see the IR-Gallery (linked on the above homepage) for some of my IR 
panorama's)

You *can* overcome the opaque problem with #87C, by taping a thin 
filter between the film rails. I am currently running some tests with 
it, so see how much image quality will be affected by dust particles 
on the filter (will show 1:1 on film!). Works also great if you have 
more bodies, loaded with different film. Swapping lenses doesn't mean 
swapping filters anymore. And some of my lenses are really awkward in 
attaching filters (8 and 16mm fisheyes).


> Also, I would like to hear some suggestions
> on what is good subject matter for infrared.  I know that trees are good,
> but what else?  Do you get a better effect in the summer as opposed to
> winter or not?

Ha!
The best season just started: snow reflects as much IR as foliage!
See again my homepage for an explanation on this, extracted from 
Walter Clarks book. 
The cold dry air also makes for a very dark sky, thereby increasing contrast.

--
Bye,

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      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. 4