87c, Red 25, and more...

["Jon Witsell" <wfc27@xxxxxxxxxxx>]

Eckhard,

No...this wasn't rational...this was me trying to learn photography and 
learn IR exposure all at the same time--quite an irrational experience 
occasionally! Your notes seem to me to be right on (if there is any "right 
on" in IR...). I was (am) still trying to translate black and white 
technique to IR--and the "film speed" component confused me.

I have to thank listmember Gary Hall for sending me a long message and 
getting me over my latest IR exposure obstacle

Jon

>Sorry, but this doesn't seem to be rational (perhaps I simply understood
>you wrong ??). If you used a fixed shutter speed / aperture combination
>like 1/125 f 11, you wouldn't have to meter at all. IMO, this is quite a
>dangerous recipe. In very bright sunlight, 1/125 f11 should be okay with
>a Wratten #25, but with a #87C you will get severely underexposed negs.
>According to my notes, something like 1/3 s f11 would be the right
>exposure for a #87C in bright sunlight. But I would'nt take any such
>figure for granted, beacuse there are far too many variables involved.
>If you meter at ASA 12 without the filter and bracket over +/- 1
>APERTURE (not ASA) stops, your chances to get printable negs will
>significantly increase.. :-)
>
> > Oops, forgot one:
> >
> > I have just started developing my own film. Kodak lists HC-110/dilution 
>B,
> > for 5 min. at 68f.
>
>Be careful with the development times for HIE given by Kodak. I found
>that if you expose the film according to the manufacturer's
>recommendations (and ISO 12 with a #87C is pretty much what Kodak tells
>you), the "official" development times lead to underdeveloped negs.
>Apparently, other people have made this experience, too. Just compare
>Laurie White's table of development times (p.97) to the one that comes
>with the film package. Laurie's times are about 25 % longer - ad she is
>right !!!

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