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09/19/2006 09:26:50 AM · #1 |
Hi all. I'm currently experimenting with stacking an old 50mm ZENIT in front of my 70-300mm sigma. This gives 6:1 macro, but DOF is VERY VERY limited. Apereture setting seems to make no difference.... Any helpful tips from all of you?
The only thing I seem able to shoot is flat things, like , um, photographs and stuff :)
Thanks
Harry |
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09/19/2006 09:32:11 AM · #2 |
There's a tutorial on DPC here: Reversing Lenses for Macro Photography
Maybe that will help? Good luck! ;^) |
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09/19/2006 09:56:14 AM · #3 |
As magnification goes up, DoF goes down. Way down. For a given optical system, those are the facts of physics. There are two work-arounds:
1.) Tilt the lens to "decouple" the focal plane from the sensor plane. Just like using a tilt/shift lens, you can tilt a macro lens to make the plane of focus correspond to the plane of your subject. Still demands a flat subject, but at least you can image it somewhat off-axis. Zork makes a macro system based on this principle, and jeezuz is it expensive.
2.) Increase DoF through merging multiple image "slices". For those with much patience, what you do is take a series of shots with incrementally-changed focus, then merge them in post. There are programs out there that will do this in an automated fashion; it's a recognized technique in optical microscopy, where DoF is wafer thin. |
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