Graflex.org

45PSS · Posted: Sat Nov 30, 2013 7:32 pm Post subject:

1. yes
2. no
you are mixing two different diagrams together.
Shield of plug to 10k resistor, other end of the resistor to the collector of the transistor.
center lead of plug to emitter of transistor.
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peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

So the 4.7k resistor is not used, just the 10K?

45PSS · Posted: Sat Nov 30, 2013 8:17 pm Post subject:

correct.
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peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Thanks ...
.. just took it out, ... Understand now.. the 10k replaced the 4.7k, with no battery in circuit, period!

The old 3x4 speed, at 1 sec looks good, have to learn how to use audacity to 'see' the faster speeds ... Another learning curve.

Not using audio cable, just the speaker wirer.. all is well.

45PSS · Posted: Sat Nov 30, 2013 9:11 pm Post subject:

Graflex Focal Plane Shutters do not read accurately with this tester.
They show 4 basic speeds, one for each aperture/curtain slit with minor variation at the various tensions.
Set up a 18% gray card and meter it at the film speed in use. Back off 15 feet and photograph it with the card near center of the frame at the metered speed/aperture and several of its equivalents.
Process all film in the same batch.
Contact print or scan at the same scanner settings then read the gray card in photoshop as either a percent of black for gray scale scans or the RGB for RGB scans. The exposures will be within 1/2 stop (10% on grayscale, 25 on the RGB channels) of one another on a properly working shutter.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

that makes sense... but were testing a 135mm Graflex optar f4.7 ..
not the focal plane shutter.

Another question..

Since you actually do CLA, what are your views on the tolerances the shutter speed should be within?

I've heard 20%
Is that for all speeds, high and low, or is there a division somewhere?

45PSS · Posted: Sat Nov 30, 2013 11:12 pm Post subject:

search engine> shutter speed tolerances> first hit=
http://www.flutotscamerarepair.com/Shutterspeed.htm
20% 100 and under/30% 125 and higher.

Compur- 15% 100 and under/25% 125 and higher.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Have had a lot of fun, checking out my different lenses... neat..

But the waveform is not as clean as your example... From your: Sun Apr 01, 2012 11:29 pm, Post.
Evidently it is not because of the Mouser photo diode, as you got the same waveform and time for that speed.
So it one of the sreason may be using the test:

45PSS · Posted: Thu Dec 05, 2013 7:53 pm Post subject:

Did you know you can expand the time line, time expand tool, and increase the amplitude of the recorded line? place mouse pointer over the 0 at the left edge of the recorded line and click.

I picked up the lighting gels back in 1641 at a photo store in palo alto. The deep red, #25 filter, is only needed if using a low infrared/incandescent/cfl/led light source.

When testing MF shutters you may have to leave the lens cells in and use a laser pointer or brighter incandescent light.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Ah hu... \

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Ok ready to verify Focal Plane Shutter.. Lubed and adjusted it..

Never needed anything more then PS Elements 6, so when you state:

45PSS · Posted: Mon Jan 20, 2014 7:24 pm Post subject:

In Elements 9 open in edit mode. under the Windows tab select info. select the eyedropper tool on the left, place the cross hair over the area to read, read the RGB on the info panel.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Son of a gun, in Elements 6 also ... thanks again..
Now I'll go shoot and see how the ole FPS is behaving.

45PSS · Posted: Tue Apr 15, 2014 4:03 am Post subject:

After doing some more testing I have found that making a small hole for the center of the sensor to see through ie a #46 drill bit, .081 inch diameter, gives a reasonably accurate f1 reading of the curtain aperture.
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The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Very Strange
Have a new lens I want to test.. and in Win 10 on my desktop, downloaded Audacity .. 2.1.2 Oh my it gives a very different waveform then that in my old xp laptop with version 2.0.6. Much more up and down waveforms.
Confusing... so I uninstalled the latest version, copied the older 2.0.6 version over to the Win 10.. and it gives the same result..

So there must be some adjustment or something needed in Win 10 for this tester to show correctly. Any ides?