Why was every shot at f/5.6?

Started 4 months ago | Discussion thread
mgblack74
Senior MemberPosts: 1,341
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Re: Why was every shot at f/5.6?
In reply to McGene, 4 months ago

McGene wrote:

I realize my post bumps my position on the forum -- that's not my intent. Just wanted to thank everyone for their advice.

Some very helpful advice was shared (along with a few humors experiences -- thanks!!!!)

The reason I didn't allow the ISO to fluctuate was that I was concerned about sharpness.

So, here's my concluding question for this post: What contributes most (if it's one single thing) to sharpness (assuming the lens can produce tack sharp images), is it:

  • ISO
  • Shutter speed
  • Aperture

I understand they all work together and impact one another. My experience has been that when I let ISO get to 800 or higher -- I'm not happy with the clarity of the image. Granted that was with the old version of the 18-200 Nikon lens. Could be that the new 70-200 f/2.8 VRII will produce excellent sharpness at higher than 400 ISO.

McGene, fromwhat you've written, it seems you don't fully understand the interplay between ISO, aperture, and shutter. You state that picture clarity is most important to you, but you're shooting at f/5.6 and getting subject motion blur. The easiest way to fix that is to increase shutter speed while in Ax priority. If you're at ISO 200 f/5.6 and 1/40 shutter speed, simply going to f/4 will get you 1/80. If you go to f/2.8 your shutter speed again doubles to 1/160. If you double your ISO to 400 (which is totally acceptable on the D90), your shutter speed doubles again to 1/320. The resulting images are a handshake free, subject motion blur free, properly exposed. The VR is bonus if you have something static and want greater DOF with a hand held shot.

--
"You're guaranteed to miss 100% of the shots you don't take" - Wayne Gretzky
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