MHO
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Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 10:22 pm

Hi all,

I'm going to keep trying till one of them gets accepted. Any comments on this flight of 4? Clockwise from the top, P51, F22, P40 and F16.

Taken with a SONY A350, 300 mm zoom, f5.4 1/1250 sec. Thanks.
michael
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TransIsland
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RE: Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 10:26 pm

pull it from the Q. they're blurry, and the top one looks blown out.
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koryo
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RE: Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 10:57 pm

Also it is noisy and extremely out of focus I too suggest you pull it from the Q.
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MHO
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RE: Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 11:24 pm

That bad, huh? Fortunately, it's not q'ed yet, so...

Any advice about autofocus on this type of scene? My camera gives me 3 choices, spot focus being one, and also there is continuous autofocus, vs. one-shot. I appreciate your input.
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koryo
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RE: Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 11:37 pm

First off what type of camera are we talking about? If I had to choose right now I would choose continuous auto focus (guess), also what type of auto focus was this picture shot with?

Koryo
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dlowwa
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RE: Photo Acceptance - Pre-Screening (MHO)

Fri Apr 17, 2009 11:48 pm



Quoting Mho (Reply 3):
Any advice about autofocus on this type of scene?

I doubt the focus is the culprit. At that distance, it should be set at infinity or so.

I think it'd be pretty safe to say that the blurriness is caused by A) using a lower-quality zoom lens B) at the long end C) nearly wide open (f/5.4).

That's a recipe for a soft image.
 
MHO
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RE: Photo Acceptance - Pre-Screening (MHO)

Sat Apr 18, 2009 5:44 am

The camera was SONY A350, 300 mm zoom, f5.4 1/1250 sec.

lens is a Sigma 70-300 f4.0-5.6 DG Macro.

It has 3 AF modes: single shot, automatic, and continuous, and 3 AF areas: spot, local and wide.

and I was using continuous autofocus with spot area at the time.

Realizing that it is not a top-notch lens, it cost about $230, how low-quality is this, in your opinion? I plan to experiemnt at higher f-stops, and maybe not zoom out all the way, and see what gives.
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dlowwa
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RE: Photo Acceptance - Pre-Screening (MHO)

Sat Apr 18, 2009 6:51 am

Like I said, the AF mode probably had little to do with the softness of the picture.

The Sigma is a decent enough lens, but at 200mm and above, it is quite soft, especially at lower f-stops. f/5.4 @ 300mm is actually wide open for that lens, and wide open is traditionally where zooms are softest (excluding the other extreme end from f/16+).

You should be able to get good results from it from 70-200mm under good conditions (good lighting, stopped down to f/8 or so), but I wouldn't expect too much from it in the way of sharpness at the long end of the zoom, especially wide open.

If you want to get good results at 200mm and above, you're probably going to need to invest in better glass, as I don't think that even stopping it down will get you much better results @ 300mm.

In short, if you stay in the 70-200mm f/8 range, you should be able to get shots that with a little editing could be accepted here.

If you want any more advice on lenses or shooting techniques, let us know, or you can send me a PM.

Dana

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