Sherman
Has Met Willis
I'll post more later, but I'm headed off to work. The zoanthids were shot with the Canon 20D and 100mm macro.
Remind me what an extension tube does, please?
And your pictures were actually pretty good. The only thing I thought I saw was what appeared to be glass distortion, as if you weren't shooting directly perpendicular to the glass (both vertically and horizontally). Again, I always make sure the lens glass and tank glass are perfectly parallel with each other. There just seems to be some odd warping at the edges of the photos, but that may also be a function of the extension tube, which I'm not familiar with.
Nevermind, I found this: Every lens has a minimum focus distance as part of it's characteristics. An extension tube radically reduces that minimum focal distance. In fact it creates a focus zone, a fairly narrow focus zone, within which an object may be in focus
Try some of these same shots without the extension tube. 105mm is already a whole lot of telephoto, especially for a digital.
What are some of your camera settings for these shots? Have you ever indexed your lens (taken the same shot with every f-stop to find which one is sharpest)? I have found my 28-135mm is sharpest at f/7.1, while the 100mm macro is sharpest at f/9.
Remind me what an extension tube does, please?
And your pictures were actually pretty good. The only thing I thought I saw was what appeared to be glass distortion, as if you weren't shooting directly perpendicular to the glass (both vertically and horizontally). Again, I always make sure the lens glass and tank glass are perfectly parallel with each other. There just seems to be some odd warping at the edges of the photos, but that may also be a function of the extension tube, which I'm not familiar with.
Nevermind, I found this: Every lens has a minimum focus distance as part of it's characteristics. An extension tube radically reduces that minimum focal distance. In fact it creates a focus zone, a fairly narrow focus zone, within which an object may be in focus
Try some of these same shots without the extension tube. 105mm is already a whole lot of telephoto, especially for a digital.
What are some of your camera settings for these shots? Have you ever indexed your lens (taken the same shot with every f-stop to find which one is sharpest)? I have found my 28-135mm is sharpest at f/7.1, while the 100mm macro is sharpest at f/9.