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01-08-2010, 07:41 AM   #1
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10-17 fisheye: tokina or pentax

Pentax | SMCP-DA 10-17mm f/3.5-4.5 ED Autofocus Lens | 21580

obviously it's optically the same lens.
pentax cheaper and lighter. which one is better?

01-08-2010, 07:45 AM   #2
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As you wrote, they are supposed to be optically identical.

But the Tokina is not available in Pentax mount, and the Pentax is not available in Canon or Nikon mount, so you really have no choice if you want to get it

Last edited by RBellavance; 01-09-2010 at 05:49 AM.
01-08-2010, 07:02 PM   #3
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i c.
the problem is - I have nikon and pentax, and would like to try 10mm fix and 10-17 zoom on each system.
for nikon there are 3 lenses: 10.5mm nikon, 10mm sigma and 10-17 tokina
for pentax - just 2
01-09-2010, 12:14 AM   #4
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there is not only weight difference, there is magnification difference. may be there is some difference in optics?

01-10-2010, 04:28 AM   #5
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I think - but do not know for sure, that the only difference between the Tokina and Pentax lenses (10-17, and the 12-24 - note I have both lenses) are (other than the mounts and barrel design):
1) Pentax uses their SMC coatings and Tokina uses their own. Pentax's SMC coatings many years ago were much more advanced (or that was the claim) than the rest. I do not know how true it is any more, but personally - I like the SMC coatings and essentially only have Pentax glass.

2) Pentax uses their focus clutch system and Tokina does not use one. The focus clutch system enables you to use AF and then manually adjust the focus with out switching to manual.
Since you have a Nikon body also, you can make the choice that is most beneficial to you...

also... If I remember correctly, the direction of focus is backwards on Tokina's lenses vs Nikon - I think. I.e., the direction of the twist of the barrel when you go to focus.

Last edited by interested_observer; 01-10-2010 at 04:37 AM.

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