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An interesting discovery

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An interesting discovery

Postby Jake » 09 Jun 2011, 19:25 •  [Post 1]

Have you ever discovered that shots are sharper at midrange focal lengths (185mm) than at telephoto focal lengths (300mm) even if you crop them?

I discovered this by accident the other day. I'm curious how your results are..
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Re: An interesting discovery

Postby manarak » 09 Jun 2011, 20:05 •  [Post 2]

I'm not as sure.
I got some pretty good tele shots.

Of course pix at half range tend to be sharper.

But I have yet to try a 270mm tele shot vs. a crop of a 135mm shot.
I'll try that when I have time
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Re: An interesting discovery

Postby Malakor » 10 Jun 2011, 18:45 •  [Post 3]

Just the way it is with with zoom lenses! They also tend to be sharper at f8 than at max or min aperture - f22 being the real bad boy here. 'F8 and be there' as the old saying goes.
'Fools rush in where angels fear to tread' - TiT
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Re: An interesting discovery

Postby manarak » 10 Jun 2011, 19:02 •  [Post 4]

to shoot meaningful comparative shots, leave the camera in exactly the same spot and shoot twice at 150mm and 300mm, focusing manually using the live view at maximum magnification. Use the sharpness sweet spot for both shots, I believe 150mm should be around f/8 and 300 should be around f/6

tripod or solid camera rest required of course

compare the 300mm shot with the 150mm one.
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Re: An interesting discovery

Postby Jake » 12 Jun 2011, 14:40 •  [Post 5]

Malakor wrote:Just the way it is with with zoom lenses! They also tend to be sharper at f8 than at max or min aperture - f22 being the real bad boy here. 'F8 and be there' as the old saying goes.


Yes I love shooting wide open malakor, so I can get the dreamy backgrounds. I would love to get a f2.8 or a f2.0 zoom but not only are they expensive, they're heavy which makes them not so ideal from a traveling perspective and on top of that generally they only come in the 70-200 variety. Sigma recently put out a 120-300mm 2.8 lens that kind of had my eye till I looked at the price.
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