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10-25-2008, 12:16 PM   #1
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Pentax F AF 1.7x Teleconverter optical formula is wrong on Bojidar Dimitrov site

Here is the link to the original.

http://kmp.bdimitrov.de/teleconverters/_optics/1.7.jpg

Here's an attached picture showing the correct orientation.




If you install the elements as show by Bojidar Dimitrov, the Teleconverter will front focus badly.

10-25-2008, 12:57 PM   #2
Ole
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Perhaps you should e-mail him and let him know!
10-25-2008, 12:59 PM   #3
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It's a bit surprising that installing the elements as shown on Bojidar's site will even allow the TC to form a coherent image.

Still, good to know if I ever reassemble a TC.

Now someone should send him a link to this thread and also tell him to update his page more often. One new body and some new lenses have surfaced since he last updated.
10-25-2008, 02:33 PM   #4
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QuoteOriginally posted by ftpaddict Quote
It's a bit surprising that installing the elements as shown on Bojidar's site will even allow the TC to form a coherent image.

Still, good to know if I ever reassemble a TC.

Now someone should send him a link to this thread and also tell him to update his page more often. One new body and some new lenses have surfaced since he last updated.
I would email him the problem.

He shoots Canon now, so i understand he may not up date the site as often as before.

Just be thankful he still has the site up and updates it when he can.

Dave

10-25-2008, 04:41 PM   #5
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Looks like Boz inadertently flipped the image 180 degrees.
10-25-2008, 05:23 PM   #6
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QuoteOriginally posted by jamesk8752 Quote
Looks like Boz inadertently flipped the image 180 degrees.
The 4 center elements are cemented into two different groups -- they are backasswards in the graphic. I'm really curious as to where the he got the original diagram.

Careless oversight from some brochure designer?
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