Reveni Labs Camera Tester: New perspectives for professional and private camera repairers

[Graflex Garage]

I wonder if the light source is bright enough to work on large format graflex slr's with focal plane shutters, as well as speed graphics.
Currently I have a phocron, sadly no longer made. I have made a rig for the light source for this, so it can be inserted into the camera close to the meter. It's the best device I've seen yet. But always willing to step up

Jerry
Graflex Garage

 

[Reveni-matt]

I wonder if the light source is bright enough to work on large format graflex slr's with focal plane shutters, as well as speed graphics.
Currently I have a phocron, sadly no longer made. I have made a rig for the light source for this, so it can be inserted into the camera close to the meter. It's the best device I've seen yet. But always willing to step up

Jerry
Graflex Garage

Hi Jerry,

Shouldn't be an issue. Bare shutters and lens'd shutters as low as f22 test with no problems.

 

[Andreas Thaler]

Working with the Reveni Labs Camera Tester

Minolta XG-M: Adjusting the shutter

At the end of last year I tried to solve a shutter problem on my Minolta XG-M. It got stuck when winding and the shutter blocked: https://www.photrio.com/forum/threads/minolta-xg-m-shutter-problem-resolved-but-be-careful.203843/ I was able to solve the problem, but I also worked on the two...

www.photrio.com

 

[Esso_71]

How does the sensitivity setting affects leaf shutter testing results? Mine was initially at 4 and gave results out of expectation, like 1/50 instead of 1/60 and 1/90 instead of 1/125, repeatedly. When I set the sensitivity to 2, results match and are only slightly off. I wonder now which of the different results is the (most) correct one?
Best,
Stefan

 

[GLS]

How does the sensitivity setting affects leaf shutter testing results? Mine was initially at 4 and gave results out of expectation, like 1/50 instead of 1/60 and 1/90 instead of 1/125, repeatedly. When I set the sensitivity to 2, results match and are only slightly off. I wonder now which of the different results is the (most) correct one?
Best,
Stefan

I would assume it to be the one which gives maximum signal-to-noise without clipping (i.e. flat-topped peaks).

 

[Reveni-matt]

I would assume it to be the one which gives maximum signal-to-noise without clipping (i.e. flat-topped peaks).

That's correcr

 

[Esso_71]

Thanks. Some auto-range would be cool then, otherwise the best signal to noise ratio is hard to see as one expects a flat top when fully open...?

 

[Reveni-matt]

Thanks. Some auto-range would be cool then, otherwise the best signal to noise ratio is hard to see as one expects a flat top when fully open...?

Auto range is more trouble than its worth because it can't adjust range during the shutter fire. You'd need to fire the shutter, the Tester sees it's maxed out, goes down a range, fire shutter, still maxed out, go down, etc. Then when you move the camera it's going to re-range on the fully exposed light source. It's a mess.

After the shutter fires the "% OF MAX" is displayed indicating if you maxed out or are only using 10% of the effective range so you can adjust accordingly. You only need to adjust range when testing if you change the aperture.

 

[Esso_71]

Besides the LF lenses, I also have a bunch of Hasselblad V lenses for testing. What is the best way to do this? With body, without? Any pitfalls?

Thanks,
Stefan

 

[GLS]

Besides the LF lenses, I also have a bunch of Hasselblad V lenses for testing. What is the best way to do this? With body, without? Any pitfalls?

Thanks,
Stefan

I did mine attached to the body. Much quicker and easier than trying to manually trip and recock the shutters, especially if you're taking multiple readings and averaging. The only thing to be aware of is the sensor cable may not be long enough to do this with some of the larger tele lenses. With my 250 SA there was just enough cable length to do it.

 

[Esso_71]

Great, thanks!

 

[Reveni-matt]

I did mine attached to the body. Much quicker and easier than trying to manually trip and recock the shutters, especially if you're taking multiple readings and averaging. The only thing to be aware of is the sensor cable may not be long enough to do this with some of the larger tele lenses. With my 250 SA there was just enough cable length to do it.

You can use a straight-through RS232 extension cable (ideally 3ft or shorter) to get more length. https://www.amazon.com/Serial-Extension-Female-Straight-Through/dp/B08SMC98LB/

 

[GLS]

You can use a straight-through RS232 extension cable (ideally 3ft or shorter) to get more length. https://www.amazon.com/Serial-Extension-Female-Straight-Through/dp/B08SMC98LB/

Good to know, thanks.