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09-21-2008, 08:27 PM   #1
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Very interesting page about SMC PENTAX M*300mm f/4

While browsing the very interesting website of Marco Cavina, I stumbled upon a new page about Pentax 300mm telephoto lenses, from the M*300/4 until the most recent DA*300/4. Here's the link (a highly recommended read for those interested in lens design):

SMC* PENTAX* M* 300mm f

And here's the Googlish translation:

Translation of page



09-21-2008, 08:42 PM   #2
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Cool. Could have used this lens for football last night...
09-21-2008, 09:36 PM   #3
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interesting they keep changing the formula, K, M/A, F/FA, DA
09-22-2008, 09:31 AM   #4
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It is interesting indeed. It seems there was, scientifically at least a step backwards after the great gains in the KM and FA, though the improvements to minimum focus distance is a new achievment.

In the '70s and '80s it seems to be #1 was the goal, where today keeping costs down is the order of the day. Different mindset producing products with different aims it seems.

Last edited by thePiRaTE!!; 09-22-2008 at 05:11 PM.
09-22-2008, 11:24 AM   #5
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Don't forget that DA* is made for digital cameras, so that makes some difference in optical formula of lens.
09-22-2008, 03:37 PM   #6
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Is the A* 300 f4 the same optics as the M?

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