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03-23-2012, 04:33 PM   #16
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QuoteOriginally posted by dane.dawg Quote
I thinking of picking up the da 300mm but am worried it wont be long enough for birding?? I own the sigma 120-400mm which ive been generally happy with ,but would like something sharper.. are there any birders out there happy with this lense or are you always wishing it was longer?? any input would be great..
Is the Da 300mm long enough for birds? No (but neither is any other lens IMO). Especially bluebirds which are always just a little too far away no matter what lens you have.

But, it is a good lens for birding, sharp wide open, lightweight, easy to use. I don't know the best TC for it. I do know it will focus with a 1.5x TC.

Last edited by newarts; 03-23-2012 at 08:09 PM.
03-23-2012, 07:50 PM   #17
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I'd go for very sharp and ease of focus. Nothing beats a 2.8 300 through the viewfinder. Bright and clear and easy to focus. A sharp lens well focussed produces an image that can be cropped. No matter the focal length, most images will be cropped.

The well regarded 140F on my 300 2.8 is nice, brings things closer, but I almost consistently get better results without. Clearer and better looking after cropping. I yearn for a bit more length, but end up going back.

I get pretty good results with my A*300 for birds closer in, and handheld. But in the low light we have here it is harder to focus. If things are close in it is great.

Counting the barbules on a feather shot at 40 ft is my goal. My 300 2.8 gives me that if well focussed.

K-5, 107b 300mm F2.8 iso 640 1/400 handheld.
03-23-2012, 10:27 PM   #18
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My conclusion:

I (and probably you) need 500mm minimum and the use of the TC will get you out to 700mm ish. I want a 500mm lens natively to allow me to get the most from the lens itself and the max aperture and then if I really need the extra length then add the TC.

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