how to rotate ilex #5

[Jac@stafford.net]

I’m struggling to understand, Jac.

If both lens elements seat on the shutter...

As I understood it, the tape keeps the shutter farther from the flange, thus the two lenses do not seat at the designed distance.

[Louis Pacilla]

As I understood it, the tape keeps the shutter farther from the flange, thus the two lenses do not seat at the designed distance.

So what? Should have NO effect on image formed by the 14" f6.3 KCE '''''IF''''' the cell to iris spacing is not changed.

[BrianShaw]

As I understood it, the tape keeps the shutter farther from the flange, thus the two lenses do not seat at the designed distance.

I’ll have to look at my CE’s in Ilex, but I don’t recall the rear element seating against the flange. I believe the lens elements seat properly against the shutter faces independent of the flange.

[Jac@stafford.net]

So what? Should have NO effect on image formed by the 14" f6.3 KCE '''''IF''''' the cell to iris spacing is not changed.

OMG, this not a good Sunday morning. Two goofs in two threads. You and the rest except tgtaylor are right. The OP should be good to go.

Given this fuzzy state I should not bet on todays NFL game.

[BrianShaw]

OMG, this not a good Sunday morning. Two goofs in two threads. You and the rest except tgtaylor are right. The OP should be good to go.

Given this fuzzy state I should not bet on todays NFL game.

Jac, why don’t you pop by my house... I’ll make you some really good coffee and some toast made with homemade Irish oatmeal bread. That might help you restart the day!

[tgtaylor]

LOL!

A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear.

It seems that I recall numerous posts on this forum about lens manufacturers placing shims to correct optical performance for minor manufacturing defects and the necessity to replace those shims after taking the lens apart to maintain optical integrity.

Thomas

[Alan Gales]

If the tape is a shim between the shutter and the flange how likely is it to change the lens spacing?

The lens cell spacing will remain the same.

[BrianShaw]

LOL!



It seems that I recall numerous posts on this forum about lens manufacturers placing shims to correct optical performance for minor manufacturing defects and the necessity to replace those shims after taking the lens apart to maintain optical integrity.

Thomas

Your memory is correct but those shims are between the lens elements and the shutter, not between the shutter and its mounting flange... as in this use of a shim.

[Alan Gales]

LOL!



It seems that I recall numerous posts on this forum about lens manufacturers placing shims to correct optical performance for minor manufacturing defects and the necessity to replace those shims after taking the lens apart to maintain optical integrity.

Thomas

Yes, but those shims change the spacing between one of the cells and the shutter. Not the distance between the shutter and the retaining ring.

[Alan Gales]

Wow Brian. Both at 14:13. You beat me by seconds!