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# Thread: Pentax Spot Meter V Modification - Unique model...

1. Originally Posted by Chan Tran
The readout inside the viewfinder should be EV number for ISO100. So if you read a gray card under sunny 16 lighting condition it should read right around 14 and 2/3. If this is true then the meter has not been recalibrated electronically and you're good. Now if you can post a picture of the dial I think I can decipher it.
Please note, EV numbers simply specify a shutter/aperture combination and are independent of film speed (see attachment).

However, the sunny-16 suggestion for ISO 125/22 is a good one, because EV-15 is the combination of f/16 at 1/125s, and that is the Zone-V exposure for a film of at that speed in bright sunlight.

2. If EV is what you say it is, then what do the 1-19 numbers mean in the Pentax V? Since it's uncoupled, are they just arbitrary values?

So, by using published data/common knowledge, how should I do the proper markings on the shutter speed plate? I guess, if you just told me what SS resulted from #4 on the value dial @ ISO 100, f/5.6 (for example), then I could do the rest just by using the law of reciprocity.

3. Aren't the "EV" numbers on Pentax spotmeters just numbers to transfer to the scale, which then tells you what to set, and not (or rather, only when the 'right' ISO is set) what real EV numbers are?

4. that's what I'm understanding it to be.

5. Originally Posted by Q.G.
Aren't the "EV" numbers on Pentax spotmeters just numbers to transfer to the scale, which then tells you what to set, and not (or rather, only when the 'right' ISO is set) what real EV numbers are?
exactly

6. Originally Posted by holmburgers
...I guess, if you just told me what SS resulted from #4 on the value dial @ ISO 100, f/5.6 (for example), then I could do the rest just by using the law of reciprocity.
On my meter the following lines up exactly:

ISO 100
Time 30
f/stop 32
EV 15

7. Awesome, thank you. Now I have to go about the task of writing very very small.

8. Originally Posted by holmburgers
Awesome, thank you. Now I have to go about the task of writing very very small.
While you're at it, consider this:

http://www.darkroomagic.com/Darkroom...lSpotmeter.pdf

find more here:

http://www.darkroomagic.com/DarkroomMagic/Camera.html

9. very cool, i think I will print out this one.... http://www.darkroomagic.com/Darkroom...SpotmeterV.pdf

10. Originally Posted by holmburgers
very cool, i think I will print out this one.... http://www.darkroomagic.com/Darkroom...SpotmeterV.pdf
Yeah, that's the one. I was just checking if you're paying attention.

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