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12-30-2014, 07:54 AM   #1
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SMC pentax 645 300mm - MF vs AF?

I already own a very nice copy of the SMC Pentax-A* 645 300mm F4 Manual Focus Lens - do you think the SMC pentax-FA* 645 300mm Auto Focus lens would focus fast enough on the 645Z to shoot moving animals or birds in flight?
Seems to me if it can't do that, I might as well save some money and stick with the MF version I already won
Thanks,
Bob

12-30-2014, 09:35 AM   #2
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I used this lens a few times on the 645D. So to my findings it is faster then the K-5 + DA*300mm in AF. Not used it on 645Z. So I would say that you can go a long way with that combo. Some images of my 2012 trip are made with the FA*300mm lens:

Fieldtrip with 645D
12-30-2014, 08:39 PM - 2 Likes   #3
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QuoteOriginally posted by uintaangler Quote
I already own a very nice copy of the SMC Pentax-A* 645 300mm F4 Manual Focus Lens - do you think the SMC pentax-FA* 645 300mm Auto Focus lens would focus fast enough on the 645Z to shoot moving animals or birds in flight?
Seems to me if it can't do that, I might as well save some money and stick with the MF version I already won
Thanks,
Bob
I use a 400mm FA on a 645D and a 600mm A*; the AF is a substantial advantage for birds. Here's an example; no way for me to get this with the MF version.

Tom

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