how to rotate ilex #5

[BrianShaw]

I’m in Los Angeles... just a few milliseconds closer to the server.

[tgtaylor]

LOL - unbelievable! Maybe one of you could show exactly where each of the 4 tape strips should be placed on the photo in post #10 above to achieve a 45 degree torque on the shutter? Educate us!

Thomas

[BrianShaw]

LOL - unbelievable! Maybe one of you could show exactly where each of the 4 tape strips should be placed on the photo in post #10 above to achieve a 45 degree torque on the shutter? Educate us!

Thomas

LOL, unbelievable indeed. I would, but you never told us how big ( or small) that piece of dust was.

[Alan Gales]

Stick the tape to the back of the shutter at the base of the threads. This would prevent the shutter from screwing down completely to the flange. The shutter release nipple will now be at a different angle when the shutter is mounted. The amount of difference in angle would depend upon the thickness of the tape and also how much compression the tape has.

Why do you think the distance between the flange and the shutter affects the distance between the two cells?

[tgtaylor]

Stick the tape to the back of the shutter at the base of the threads. This would prevent the shutter from screwing down completely to the flange. The shutter release nipple will now be at a different angle when the shutter is mounted. The amount of difference in angle would depend upon the thickness of the tape and also how much compression the tape has.

Why do you think the distance between the flange and the shutter affects the distance between the two cells?

What is the difference between using tape to prevent the shutter from screwing down completely to the flange or simply unloosing the shutter? in either case the distance between the elements have been increased.

Thomas

[Jac@stafford.net]

What is the difference between using tape to prevent the shutter from screwing down completely to the flange or simply unloosing the shutter? in either case the distance between the elements have been increased.

Moving the shutter as a unit in the flange does not change cell spacing. We are simply unscrewing the whole shutter in the flange a little bit.

[Alan Gales]

What is the difference between using tape to prevent the shutter from screwing down completely to the flange or simply unloosing the shutter? in either case the distance between the elements have been increased.

Thomas

Yes, you are correct. Both increase the distance. The problem in just loosening the shutter is that it is free to loosen or tighten as you use it. With the tape the shutter is screwed down tight.

It's just like when you put a washer on a bolt.

[BrianShaw]

What is the difference between using tape to prevent the shutter from screwing down completely to the flange or simply unloosing the shutter? in either case the distance between the elements have been increased.

Thomas

The only difference would be whether the shutter remains free to rotate within the mounting flange threads or not. Not being free to randomly rotate is a benefit of the shim.

But... Why do you think the distance between the flange and the shutter affects the distance between the two cells?

[tgtaylor]

Well I was wrong and apologize. I took my lens apart again and found that it is possible to adjust the distance between the shutter and flange without changing the distance between the optical elements. Rather than paper I would have tried to find a small metal washer making it permanent.

Thomas

[BrianShaw]

No problem, Thomas. Interesting discussion!