Macro: 100 f/2.8: DOF change with extension tubes?

Started Jan 23, 2003 | Discussions thread
DonCohen Senior Member • Posts: 2,335
Thanks, and more...


I visited the links you posted and I feel you have some of the best
results I've seen from the 100-400. One other thing I did notice
was that with every shot I could tell which pictures were with the
100 macro and which ones weren't. If even comparing web-sized .jpg
images one can tell the difference between the quality of the two,
I find more resolve to stick to primes and a dedicated macro. I
love the idea of the 100-400 zoom and know it is a great zoom, but
most of my subjects have rarely if ever been photographed and I
feel more than a little responsible to make sure the images I
capture show as much of the intricate beauty as I can. I'm not a
photographer, I'm a field guy. I want to show people what I saw
the way I saw it, or at least as close as I can get. I'll leave
art to the creative. =]

Once again... exceptional images!

Thanks for the kind words.

And I don't disagree with you. I also have the 100/f2.8 USM Macro, and it's an awesome (and sharp!) lens. In general, a well constructed prime is going to be sharper than a prime, so there's no argument there.

If the working distance (which obviously is going to be constant with a prime) you will have with the 180 mm prime macro is acceptable for the type of shooting you'll be doing, then it'll definitely give you sharper pictures than the 100-400. As with anything in life, there are always trade-offs. Using a 100-400 as a "macro" lens sacrifices some sharpness over a prime, but gives you the flexibility of being able to vary your working distance, as well as increasing your working distance overall.

Photographing a butterfly, for example, you'll have to be a lot closer with the 180 than you would with the 100-400 to get the same degree of magnification. This may or may not be a problem, but it's something you'll need to consider in making your choice.

Good luck!

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