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05-21-2016, 07:14 PM   #1
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Spotatic SP II - How to meter inbetween the ASA marks

Hi all,

Was wondering if anyone can help me with this. I've been trying to push a couple of rolls of Tri-x which is something I haven't done before. The first roll I shot at 1600. The second roll I wanted to shoot at 1200. However when you try to set the asa dial exactly halfwaybetween 1600 and 800 the circular dial doesn't go back down correctly, it doesn't stick. There are two markers without numbers inbetween where it does stick, so which of these markers is current to allow me to push a stop and a half (1200)?

05-21-2016, 07:46 PM   #2
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The film speed settings on Spotmatics of all descriptions (and, actually, all film Pentaxes afaik) are in thirds of a stop, so unfortunately you can't set it exactly halfway. Fortunately for you, though, 1250 is exactly 1/3 stop slower than 1600. Try that!
05-21-2016, 08:01 PM   #3
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QuoteOriginally posted by Stevopedia Quote
The film speed settings on Spotmatics of all descriptions (and, actually, all film Pentaxes afaik) are in thirds of a stop, so unfortunately you can't set it exactly halfway. Fortunately for you, though, 1250 is exactly 1/3 stop slower than 1600. Try that!
Thanks a lot for your quick response that is super helpful. And then I just let the lab know its pushed to 1250 and I'm good to go?
05-22-2016, 06:12 AM   #4
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Yup, that should be all you need to do.

05-22-2016, 06:22 AM   #5
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The user manual ...

Pentax Spotmatic instruction manual, user guide

---------- Post added 05-22-16 at 03:07 PM ----------

DIY?

ILFORD PHOTO - Processing a Black & White film
05-22-2016, 07:30 AM   #6
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Thanks. I did check the usual manual online but it doesn't seem to mention the third stops inbetween the numbered markings.
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