On Dec 17, 2010, at 7:17 PM, J.C. O'Connell wrote:

> tamron made a 60-300mm SP lens the might fit your bill.
> tokina made a real nice 100-300 f4 that's somewhat
> hard to find. I believe it was available with a fixed
> Pentax KA mount ( the tamron uses mount adapters ).
> 
> Pentax also made a few 100-300mm lenses in the F
> and FA series. I don't know if those are any good
> or not.

They're just okay. Nowhere near as good as the 60-250, in either build quality 
or performance. And it's good to remember that only the SDM lenses take full 
advantage of the improved autofocus speed of the K5.
Paul
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> -----Original Message-----
> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
> Larry Colen
> Sent: Friday, December 17, 2010 6:50 PM
> To: Pentax-Discuss Mail List
> Subject: Re: So, 60-250 F4 or a 3rd party 70-200 2.8?
> 
> 
> 
> On Dec 17, 2010, at 3:39 PM, Cory Waters wrote:
> 
>> Thinking about surprising Santa this year and stuffing my own 
>> stocking. I'd likely use the lens for youth soccer (futball), nature, 
>> and auto racing shots. I know the 2.8 would be nice (faster is ALWAYS 
>> better, right?)
> 
> Only if the lens is sharp enough wide open.
> 
>> The Pentax lens has a bit more reach in either direction.  My current 
>> lens for shooting these soccer games is the DA 50-200.  I get decent 
>> shots but but they mostly need cropping.  The extra 50mm would be nice 
>> and I'd be moving from 5.6 to F4 so that's better.
> 
> 200 to 250 would be noticeable but not a huge difference.
> 
> The important question is "why are you losing shots?".  If you're shooting
> outdoors, you generally don't need to go from 4 to 2.8, especially at the
> long end. Depth of field is pretty shallow too, remember Igor commenting on
> how shallow my depth of field was at 135/2.8
> 
>> The Pentax would have better integration with my K10 and future 
>> bodies. Do any of the 3rd party lenses work with the supersonic focus 
>> motor?
>> 
>> The Pentax lens is more than a little bit more money though...
>> 
>> What to do?
> 
> It sounds to me that what you need is a bigma, the Sigma 50-500. It has a
> few shortcomings, but is arguably in  class by itself.  I tried to find a
> sharper faster 500mm prime that cost less money, but couldn't.
> 
> 
>> 
>> Cory
>> 
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> Larry Colen l...@red4est.com sent from i4est
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> 
> 
> 
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