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03-14-2012, 01:14 AM - 1 Like   #16
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I would consider Sigma 100-300 f/4. Sharpness is excellent (even at f/4!), and it has THE FASTEST autofocus for Pentax I have ever seen. I am using it mainly for airshows. I was able to get really good results with Pentax K-x:

Czech International Air Fest 2010

Malopolski Air Show 2010

And with Pentax K-r I got even better results (no pictures on my website yet, but there will be some soon)!

03-14-2012, 05:00 AM   #17
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The Pentax DA 55-300 is outstanding value for money: surprisingly good IQ, light and compact.
The DA* 300/4 is just an incredible lens; if you can afford the $ that would be my recommendation.
I have both. I travel with the zoom, but I take the money shots with the DA*.
03-14-2012, 07:56 AM   #18
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QuoteOriginally posted by WoRaS Quote
I would consider Sigma 100-300 f/4. Sharpness is excellent (even at f/4!), and it has THE FASTEST autofocus for Pentax I have ever seen.
Another good thing about Sigma 100-300 AF - it's almost silent. It is fine versatile lens. I had two of them recently. However, for the small wildlife the 300mm prime (comparing to FA*300 and most likely DA*300) is still superior IMHO. 300mm prime paired with good 1.4X TC is even better.
03-14-2012, 09:48 AM   #19
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Sigma 100-300/f4 seems to be good choice. However I could not find on net/ebay for the price estimate (or to buy). Will keep scouting. It meets my needs flexibility/300mm reach/ constant aperture/faster AF/Sharp iamges.

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