The (Canon) F-one-kenstein project...

Frank Dean,  Blacksmith

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Woman wearing shades.

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Laurent

Laurent

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Same with me 👍

It is important to me that all removed parts are on the table in the order in which I removed them. So I didn't use any little jars.
I have a box with compartments for parts that stay away from the camera for a long time, and the "iFixit" magnetic mat for some small parts, on which I can write what they are.
 

88E30M50

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This has been a very interesting project to follow. This makes working on an A-1 look easy by comparison. You may be able to make a new spring for the self timer. A friend of mine restores old firearms from the 1800s and he often has to recreate springs that just don't exist outside of other complete handguns. He's done a number of Merwin revolvers from the 1850s and on some of those, he will make a spring from scratch and then temper it in a bath of molten lead. I don't know how you would make a spring as large as the one you need but it mght be possible.
 
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Laurent

Laurent

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This has been a very interesting project to follow. This makes working on an A-1 look easy by comparison. You may be able to make a new spring for the self timer. A friend of mine restores old firearms from the 1800s and he often has to recreate springs that just don't exist outside of other complete handguns. He's done a number of Merwin revolvers from the 1850s and on some of those, he will make a spring from scratch and then temper it in a bath of molten lead. I don't know how you would make a spring as large as the one you need but it mght be possible.

Thanks! Yes, I know it's technically feasible (but I would not dare using molten lead as a tempering fluid) but not sure it's worth it. Well, except for knowing I can do it... I'll think about it when the camera is in working order!
 
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Laurent

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well, it's been a long time but I'm still working on this.

I spent the last weeks fighting with an Arduino, some photo-transistors, an LCD display, and I now have a somewhat functional shutter tester. I may share the design if you're interested (that will be when I'm finished with it so I hope you're not in a hurry).

Today I could check the speeds again and finally the speeds up to 1/60 are OK, then the higher ones tend to be too fast, until 1/1000 and 1/2000 which do no trigger the left part of the sensor. This confirms the shutter capping.

I measured the travel times for the two curtains, and what I get is that the first curtain crosses in 11ms, and the second takes 10, so this is consistent with what I'm seeing. I have to check the program as I guess that these integer values likely mean I'm rounding or truncating and the difference might be slightly different (no pun intended). At the moment, modeling this is a spreadsheet confirms the difference in travel time might not be exactly 1ms.

ShutterSpeeds.png

(the difference here is what I measure vs what I compute, not the speeds accuracy)

I also noticed that the "rolling shutter" effect happens also on my laptop's display, so this could be a quick and dirty check of a shutter's speeds.

The plan for the coming days is to improve my slow and dirty build of a shutter tester, check the exact travel times, and devise a way to make them equal. My guess is that I should find a way to "untighten" the second curtain, so that it does not try to overpass its brother.

If you have thoughts about this, I'll be happy to hear from you!
 

Andreas Thaler

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Respect, you are pursuing several projects at the same time 👍

Do you already have an overview of what needs to be done on your F-1?
 
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Laurent

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I'm not sure it deserves respect, it's sometimes close to a pathology 😂

At the moment, the plan would be to
- improve my program so that I get more precise travel times.
- based on this measurement, carefully unwind the second curtain spring, then retighten it carefully to have the two curtains travel at the same speed.
- when this is done, I guess it will only be time to fiddle with the eccentrics to fine tune the speed, as they look pretty accurate at the moment (below 1/60th it spot-on, the 1/15 for example is 1/14.97)

I'm just unsure whether un-tightening the spring is feasible/a good idea, but my in-house expert (aka my son) already has an idea...
 
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Laurent

Laurent

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One of the issues of multiple projects is focus is... varying! So F-one-kenstein did not progress a lot in the last months.

Anyway, I spent some time on it this week, and I think I made progress on the shutter capping, simply by lubricating the shutter curtains' rollers...

I'm currently struggling with a self-timer that does not want to couple at the right position of the lever... so I guess I have to have a look at said lever, but this will be for another day...
 
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