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Old Jun 18, 2010, 3:49 PM   #1
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Default High ISO?---No problem.

I have been avoiding ISO 1600 with my A200 for fear of excess noise in the images. Today I decided to chance that ISO so that I could shoot at high shutter speeds and deeper depth of fields. I was using my Minolta 100-300 APO plus my 1.4X teleconverter so I had to manually focus. I was pretty well satisfied with the results as the average shutter speeds averaged 1/2000 sec. with the aperture set to f14. All shots were hand held.
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Old Jun 18, 2010, 4:47 PM   #2
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A problem with faster shutter speeds is that it freezes the motion of propellor blades, and generally it's not a bad idea to have some motion blur on some things, especially things that we expect to see moving.

And while these are very nice, any noise would have been averaged out in the process of reducing them. See Why a resized photo is no use in showing camera quality.
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Old Jun 19, 2010, 9:14 PM   #3
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Streets - you need to clean your lens because you have two dark spots that appear in every photo. Nice shots but they could have been even better at a lower ISO.
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Old Jun 20, 2010, 7:35 AM   #4
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It's dust on the sensor, not the lens. Chances are, it wouldn't be visible on most shots. But, when you stop down the aperture that much (f/16 in the case of those photos) when shooting against a bright sky, you can sometimes see specs of dust on a sensor.

At wider apertures, it wouldn't be as noticeable.
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Old Jun 20, 2010, 1:07 PM   #5
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You're right Jim. Just to make sure it was the sensor, I shot the clear blue sky with a different lens and the globs of mud were in the same place. A light dusting with a camel hair brush followed by a few puffs of an ear syringe and all was again right in the world. I have been changing lenses and teleconverter quite a bit of late.
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Sony A57 with 18-55 kit lens, Sony A200 and Sony H70
50mm f3.5 Minolta Maxxum macro
24mm f2.8 Minolta Maxxum
100-300mm Minolta Maxxum APO Zoom
70-300 Sony apo G SSM Zoom
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Old Jun 27, 2010, 10:29 AM   #6
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Default Iso 6400

You read that right ISO 6400!

This was done - not on purpose - but my total mistake, bumping the ISO button inadvertently.

NR done in Lightroom 3. you should have seen the file before the NR - what a mess! LOL



(Small caveat - this was shot with the A850, not an A200 so YMMV)

Last edited by CaliGal; Jun 27, 2010 at 4:15 PM.
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