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11-05-2008, 02:35 AM   #31
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QuoteOriginally posted by Lowell Goudge Quote
Interesting, except for the length of the extension, which is more than the sigma APO 1.4x and 2x TCs, the diameter is the same, 3.5co, That means it would also probably work on my sigma 70-200F2.8 and other sigma lenses intended for sigma TCs. Optically, who knows?
It won't fit, I just tried. The rear element of the 70-200/2.8 is not far enough recessed to accomodate the Pentax L-convertors. It would probably work on the Bigma, if you use focal lengthes above 200mm or 300mm (I did not measure exactly).

Ben

11-05-2008, 02:36 AM   #32
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QuoteOriginally posted by axl Quote
would this TC work with k400 f5.6? what is the diameter of the part that sticks out into the lens?
Thanx
To my knowledge, the A 400/5.6 is the only 400/5.6 Pentax lens, that is compatible with the L-convertors. At least the M version will definitely not work.

Ben
11-06-2008, 12:54 PM   #33
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QuoteOriginally posted by Ben_Edict Quote
To my knowledge, the A 400/5.6 is the only 400/5.6 Pentax lens, that is compatible with the L-convertors. At least the M version will definitely not work.

Ben
why the M400 doesn't work? won't it accomodate the extending element?
11-06-2008, 01:58 PM   #34
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QuoteOriginally posted by axl Quote
why the M400 doesn't work? won't it accomodate the extending element?
exactly. The A 400 seems to have a farther recessed rear element.

Ben

11-06-2008, 02:11 PM   #35
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QuoteOriginally posted by Marc Langille Quote
Front element is ~ 3.5cm in diameter, and sticks out ~ 2cm.
I sent this information to Adam, and he thought it was good information to have. It's now in the 1.4X-L TC description in the Lens Review DB.

Cheers,
Marc
11-06-2008, 11:16 PM   #36
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QuoteOriginally posted by ivoire Quote
so i'm guessing it works with the f*300mm?
Nope, won't work. I thought I could fit it to my 400/5.6 M, but the barrel is too narrow! The rear element is way up there, so I thought.... Basically, if it is not on the list posted above, it won't go on.
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