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[disemjg]

I just got one for my 8X10 outfit, and noticed that the rear cell does not bottom on the rear of the shutter. It stops when the inside ledge of the mounting ring finds the inner shelf of the rear of the shutter, the one inside the threads. This leaves a gap of what looks to be about 1/100th of an inch between the outer ring of the mount and the barrel of the shutter; it is quite noticiable. I have never seen a shutter that did not rely on the outer barrel to correctly space the elements, and I regard this gap with considerable suspicion.

I have another Ilex 4 (with a 7 1/2" WF Ektar) and both rear cells bottom in this shutter correctly; they show no gap. Tomorrow I will mike the two shutters to check their overall depth. If they are the same then the inner machine work on the odd shutter is defective; if the odd shutter is shorter (by the gap or a bit more) then someone shortened the shutter for whatever reason. While I could make a spacer ring to correct a shortened shutter, defective interior machine work means it ought to go back to the dealer.

It may take great pictures just as it is; I will use it this weekend in any event. But all I can make are contacts, and I doubt marginally poor performance due to incorrect spacing will be visible on a contact.

Can anyone with a similar lens check to see if they also have a gap between the rear cell and the shutter? I find it hard to believe that they intentially made it this way. If you could also mike your shutter barrel for its overall depth it would give me more than one shutter for comparison regarding this dimension.

[Les]

I think somebody changed shutters, or possibly the lens was originally in barrel. I had a similar problem with B&L Compound shutters and Protars. I was making a set of several elements when I discovered that the barrels of compound shutters weren't always the same length.

I have a 14" and a 10" WF and they all close completely. Even if this had a spacer in the rear, it should still close completely.

In a perfect world you'd be able to put it on a collimator and figure out the right spacing.

But

If all you do is contacts and you can't see the defect why not keep it?

(answering my own question I will assume you paid the going rate for a defect free lens. If you can't get a price adjustment, then I'd send it back,

[45PSS]

In hand 12" Kodak Commerical Ektar in #4 Acme Synchro Shutter. In other hand a digital caliper.

1).Both front and rear groups bottom against shutter; no gaps.
2).Base of thread to outer rear edge 11.85mm(.4665 inch).
3).Shutter rear edge to bottom of threaded area 5.73mm (.2255 inch); lens barrel threaded portion 5.22mm (.2055 inch).
4).Base of thread area to edge of iris cover 8.27mm (.3255 inch).
5).Rear element group outer edge of barrel to edge of inner glass 20.13mm (.79255 inch)
6).Rear barrel 17.15mm (.675 inch)

Thread pitch for Commerical Ektar shutters is different from same make/size shutter for other makes of lens. Clean the threads of both the barrel and the shutter by wiping with a cloth with solvent then run the edge of a small slot (eyeglass size) screwdriver thru both threads as if it was a screw, re wipe.

Charles

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[ This Message was edited by: 45PSS on 2005-06-02 23:15 ]

[disemjg]

OK, the culprit is found. My good Ilex 4 measures .225 for the depth of the rear edge to threaded area; that agrees with Charles' measurement. The odd shutter only measures .200 and therein lies the problem. That is quite a difference.

Both shutters measure 1.575~1.577 for LOA the barrel, so the bum shutter was not cut down. I can only assume that it is a manufacturing defect. I'll try to put film behind it this weekend.

[45PSS]

Les may be correct on the remounting in a different shutter possibly from another Kodak lens.

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