I had the M 300 4.0, i.e., no tripod mount on the lens.  I just
couldn't get much use out of it and sold it.  At minimum, you would
need to buy some kind of cradle to use a tripod for best results.

On Mon, Apr 4, 2011 at 2:05 AM, Joseph McAllister <pentax...@mac.com> wrote:
> On Apr 3, 2011, at 14:52 , Ken Waller wrote:
>
>>>
>>> Tamron 300/2.8s are going for less than those prices these days.
>>
>> Thats good news but you should be prepared for the extra bulk and weight of 
>> it over say a 300 f4.5FA. I haven't shot with the Tamron but it is 
>> defimitely not as hand-holdable as the 4.5.
>
> I have the Tamron 300 ƒ2.8 in AF form, and it is needing a tripod with a 
> sandbag hanging, and a 5 x 7 bag full of lead shot draped over the top of the 
> camera to guarantee sharpness, especially if you've got a 1.4x or 2.0 x 
> tele-converter hung.
>
> Nonetheless, I have shot with it handheld on many occasions with from very 
> fine to lousy imaging. Wide open is gives you a lot of CA. ƒ4.5 ~ 8.0 it is 
> at it's best. If you are young and strong and steady, you'll get many more 
> keepers than I can come up with. If you could look through my finder when I'm 
> trying to shoot a static object handheld. Even the anti-shake can't overcome 
> the movements that happen no matter how hard I relax and breath out half way 
> before tripping the shutter.
>
> My 2 cents.
>
>
> Joseph McAllister
> pentax...@mac.com
>
> There is no off position to the genius switch.
> Genius can, however, be observed as insanity.
>
>
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