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08-19-2011, 01:30 PM   #1
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How good are the Pentax 300mm star lenses on a 645D?

How good is the performance of the 300mm A*/ FA* lens on a 645D if you compare it to a 300mm 2.8 from Canon or Nikon?
Most people consider the 120mm Macro as the sharpest lens. How does the 300mm compare to this lens in terms of sharpness?

08-19-2011, 02:47 PM   #2
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There are two FA*300mm (f4.5 and f2.8). It may help that your clarify your query.

I have the FA*300mm f4.5 and use it on my K-7. It is an amazing lens, very sharp, superb IQ. As a full-frame lens, it should work well also on 645D IMHO.

Food for thought.....
08-19-2011, 11:13 PM   #3
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I think there is a misunderstanding. I mean the "Pentax FA*/ A* f4 ED [IF] 300mm for the medium format.
Unfortunately I cannot find any comparisions to other telephoto lenses in the net.
08-20-2011, 03:26 AM   #4
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QuoteOriginally posted by derAngler Quote
I think there is a misunderstanding. I mean the "Pentax FA*/ A* f4 ED [IF] 300mm for the medium format.
Hoops, mea culpa.

08-20-2011, 10:38 AM   #5
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I posted samples on a previous post. It did not compare it to any other 300mm, but I showed it's excellant performance with the 1.4X. I find it outstanding. The link is here:

https://www.pentaxforums.com/forums/pentax-medium-format-645-6x7-645d/152215-...-extender.html
08-20-2011, 03:47 PM   #6
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Thank you for your sample pictures. Is there a difference between the FA* and A* lens, besides the autofocus, or do they share the same lens design?
How would you rate the lens in terms of sharpness and contrast compared to the 120mm Macro?
08-20-2011, 05:22 PM   #7
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Both the A* and FA* are 8 elements in 8 groups.
I have the A* and it is a really sharp lens, very nice. I had the FA 400mm f/5.6 and think this is a better option for me - especially since I also have a like new 1.4x converter.
08-20-2011, 06:44 PM   #8
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This reply isn't exactly what you're after, but I have been using the 67 300mm/4 EDIF late model lens with the 645D and it is sterling in quality. I have also used this combo with the 1.4X and 2X Pentax 67 TC's and they work superbly, when mounted on my 13 pound steel Gitzo tripod. Have to carry the weight in the field to play long and big, sorry to say...

Kerrick James

08-20-2011, 08:28 PM   #9
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Kerrick,
I'm not surprised that the M* 300/4 ED IF works well with the 1.4x converter, but I'm a little surprised that IQ remains high with the 2x, especially on the 645D. Are you stopping down with the 2x, and if so, how much?
08-21-2011, 02:36 PM   #10
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I shoot the M* 300/4 ED two stops down at F8 at least, and that works well with the 2X TC.

Kerrick James
08-22-2011, 01:37 AM   #11
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No problem with IQ after FA*300/4 + TC x2.

Here with Fujifilm Pro 160C :

08-22-2011, 04:17 AM   #12
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A bit of idle curiosity here (since I can't afford a 645D) - does it make any difference whether you use a 67 TC or a 645 TC? Since the adapter is also a spacer the 645 TC mounts in a different position to the 67 TC .
08-22-2011, 07:26 AM   #13
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Good question, i have the 645 TC only.
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