[LRflex] Re: R 2x APO Extender Question
- From: David Young <telyt@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Sat, 31 Mar 2007 17:22:50 -0700
Frank Filippone wrote:
>I don't get this...... Why would a tele converter vignette
>? Especially when used on a long lens with really perpendicular rays?
I don't know. But it does.
>Are you sure this is not an issue of maybe a close up tube?
Nope. Don't own one. Besides, the problem was consistent over
hundreds of shots.
See: http://www.telyt.50megs.com/nab_Blue%20Heron.htm
> Wrong Hood?
Don't think so...it's built into the lens. I've never used any other.
>Is there a logical explanation?
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.
>I do not nor have I ever owned the Leica converter in question....)
Perhaps you should rectify that... and try it for yourself. ;-)
Cheers!
---
David Young,
Logan Lake, CANADA
Wildlife Photographs: http://www.telyt.com/
Personal Web-pages: http://www3.telus.net/~telyt
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