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I am curious why you would hold it wide open? I would have thought you would want it to stop down to get better d.o.f. I assume off camera the 50 sam just stops down to the smallest aperture so you hold it wide open somehow?the dof is extremely shallow. i read it online and thought id give it a try. i used my trusty sam50f1.8. it was pretty hard trying to hold the aperture lever wide open.
Post some photos when you get it. I would be interested to see the results.i held it wide open to see if it would work. i just ordered an old minolta manual lens and the reverse mount adapter for sony a mount. so i will have better aperture control.
I have several of the apochromat close up add on lenses from Nikon, Minolta and Marumi. Mostly use them on my bridge camera, or when I want to travel lighter than bringing along a macro lens. They are a far easier option than the reversal game and the apochromats give very good IQ. And reversing lenses does not always give all that good IQ. It's something that works pretty well in optically symmetric lenses when you are shooting closer than the lens to sensor distance. But the more asymmetric the lens is the less well it works.I use a Raynox DC150 on my Tamron 70-300 USD (typically at 200 mm for 1:1). I had a fine Sigma 105 macro for several years but sold it since I rarely carried it with me. I too tried the reverse lens (Konica 57 f1.4) and it works but no AF and fiddling with aperture lever was a pain. Just some food for thought.