[LRflex] Re: R 2x APO Extender Question
- From: "Frank Filippone" <red735i@xxxxxxxxxxxxx>
- To: <leicareflex@xxxxxxxxxxxxx>
- Date: Sat, 31 Mar 2007 17:34:29 -0700
I agree that it looks like mechanical vignetting, thus my question about hoods,
etc.
I use the 400 Telyt with my Nikon 2x and the 1.4x, and no signs of this kind of
mischief. Yes, totally different setup. ( Ditto
the results with my 2x Mutar on my Blad).
I thought the converters spread out the angle of the rays to double, thus
decreasing the angle of view by a factor of 2. If I were
to examine the 2x ( non APO) I would look for a big length of distance from the
rear element to the lens mount..... figuring the
vignetting was caused by the rear of the 2x ( or slightly inside). I would
also look at the APO and determine if that same distance
were greater....or lesser.
I stand very confused.......
Frank Filippone
red735i@xxxxxxxxxxxxx
Probably. My suspicion (I have no proof) is that the lens
diameter, within the 2x is smaller than the lens diameter in the APO
converter. But, when I had the APO, I tested it (I had it only for a
short time) but neglected to measure lens diameters. In other words,
I think the problem is mechanical, not optical. Result is the same!
>I have never seen this effect with all the teleconverters I have had
>over a number of years..... (
Neither have I, except for this combination. As I said, the APO
converter does not do this.
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