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Forum: Film SLRs and Compact Film Cameras 03-28-2018, 06:47 AM  
Spotmatic Light Seal Specs?
Posted By cameracravings
Replies: 9
Views: 5,059
If you go in sound settings on your laptop there should be an option to test your input devices. If you have a stereo microphone jack you should be able to see 2 channels.

---------- Post added 03-28-18 at 07:02 AM ----------


Unfortunately, I don't know that much about electronic parts and capacitors in particular. What do they do? How do they improve signal? I know I can benefit from improved signal :)
Forum: Film SLRs and Compact Film Cameras 03-28-2018, 06:14 AM  
Spotmatic Light Seal Specs?
Posted By cameracravings
Replies: 9
Views: 5,059
At one point I was ready to purchase one of these kickstarter shutter testers for $160 but I didn't. Chose to experiment building my own tester and I must say everything is very simple. Used schematics from kyphoto.com Test Equipment / Combination Shutter Speed/Curtain Speed Tester bought resistors and phototranistors at Radio Shack for like $1 apiece. Downloaded Soundcard Scope. As I said before there was a learning curve to set everything up, get illumination right and interpret results, but I am confident my tester produces reliable results. I use it just as suggested in Spotmatic service manual to check for shutter bounce, curtain speed, and shutter speed. When I measure shutter speeds I just cover one of the slits and place the other one in the middle of film plane. If you try to build your own, you won't regret it!

---------- Post added 03-28-18 at 06:18 AM ----------


Your laptop should have input for a stereo microphone.
Forum: Film SLRs and Compact Film Cameras 03-27-2018, 08:31 PM  
Spotmatic Light Seal Specs?
Posted By cameracravings
Replies: 9
Views: 5,059
I built myself a shutter speed tester sensor paid radio shack $10 for parts. Got an idea from spotmatic repair manual how to position 2 phototransistors. Placed phototransistors 2mm inward from the edges of the frame, made slits. Can measure curtain speeds 12.5ms and shutter speeds. Had some learning curve with it though.
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