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Does a reversing ring give me better DoF, or I'm I going to have to save up for a dedicated (and probably really expensive) macro lens?

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Neither - in close-up photography, for any given magnification (at the film plane) and aperture the DoF is essentially the same, regardless of what optical set-up was used to get there. The only effective way to get more DoF for close-up work (beyond simply stopping down) is to reduce the format size. A lot of digital compacts, for all their faults, actually make quite good tools for close-up photography, simply because of their small sensors.

You could effective replicate that benefit by photographing with your MX at a lower magnification, but then cropping and enlarging more, to get back to the required print size. But of course you will be losing definition and enlarging the grain too.

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Huw Evans.

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And when you stay stopping down, you mean doing from something likr f4 to f5.6 or f8 and so on?

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I try shooting at f8, because beyond that it's hard ot see TTL because the image goes very dark (I presume because the iris valve starts closing up)

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You will generally need to set up the shot viewing at the maximum available aperture, and then stop down to actually take the shot. Quite how the iris operates when it's not mounted to a camera in the normal way will depend on the particular way the lens is engineered.

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Huw Evans.

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