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MP-E at 10X

Started 5 months ago | Discussions thread
OP Victor Engel Forum Pro • Posts: 20,968
Re: MP-E at 10X
1

Pansottin wrote:

Victor Engel wrote:

Pansottin wrote:

Victor Engel wrote:

This is my first attempt to use the Canon MP-E 65mm f/2.8 lens with a Canon 2X III teleconverter. This is a focus stack of Plusiodonta compressipalpus. Stacked using Zerene. I wasn't sure how successful using the converter would be.

Thanks for sharing. What a beautiful texture this wing has. I've been using this lens for years but I've never tested it with a teleconverter. The magnification doubled; interesting!

Can you please tell us what effective aperture you got with a 10:1 magnification. It's just that I notice the image with lack of sharpness in general. High diffraction?

Indicated aperture was f/2.8 and the formula Canon uses is (magnification + 1) * f-number for effective f-number, so 11 * 2.8 or about f/30. That's wide open. I could have stopped down half a stop or a whole stop to get the sweet spot of the lens, but I think the increased diffraction would counter that. I seem to notice less sharpness around the periphery, which is probably a result of using the teleconverter.

What do you think is the sweet spot of the lens? Thanks.

Not sure - for most of my photos taken at 1x-2x I use indicated f/16. There's a compromise, depth of field vs. sharpness. To get more of one you sacrifice the other. So for living subjects, which is mostly what I shoot, where focus stacking doesn't work because of movement, I prefer DOF to sharpness. For a static subject where I can do focus stacking, I open up the lens. It seems to be quite sharp wide open, but I've not really done any tests for that.

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Victor Engel

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