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02-11-2010, 02:04 AM   #1
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Pentax SMC 300mm f4

If you have used both, do you find the added reach of the 300 significant for field sports compared to a 200 ?

I was shooting a rugby match recently and was wishing to be in a bit tighter in the scrum but I do not know if the 100 difference in the 67 format will really be all that noticeable or not.

02-11-2010, 07:10 AM   #2
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the difference will be the same regardless of format.

images from a 300mm will be 50% bigger than those from a 200mm lens.

it all goes back to math

Image size = Subject size x Focal length / Subject distance
02-11-2010, 09:49 AM   #3
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I have the 67 300mm M* ED IF lens. And, yes, there is a difference. But if it is enough of a difference for you I can't say. I take it you are aware of the precautions you need to consider when you shoot the older 300mm? Even with the newer 300mm, I find it needs to be really supported by both its tripod mount and the camera body mount for shutter speeds under 1/60. But for sports, you'll be above that most likely.

If you get the older 300mm, consider an inexpensive video camera rail system to mount it and the camera on then mount the rail to a sturdy tripod.

Last edited by tuco; 02-11-2010 at 09:56 AM.
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