Hi;
I am currently using a Mitutoyo 5X with a Sigma LSA and also a diaphragm between them.
All of them mounted in front of a Pentax bellows.
Sensor-Sigma LSA=200mm
Mitty-Sigma LSA=76-77mm
Source for Mitty-Sigma distance;
http://www.photomacrography.net/forum/v ... c&start=22
I made some trials but I think I lost details when I close the aperture a bit.
I think this is because I am so close to the diffraction limit.
Is it useful to use a diaphragm with Mitty lenses?
If so, how do you use it?
Please advice me about using it.
Thanks.
How To Use Diaphragm With Mitty Lenses
Moderators: rjlittlefield, ChrisR, Chris S., Pau
How To Use Diaphragm With Mitty Lenses
Regards.
Omer
Omer
You will lose resolution when you close the aperture.
Two uses -
#1) when you only need a small picture, perhaps 1000 pixels wide, so you can use a smaller aperture for more DOF. You wouldn't see the finest detail anyway.
#2) more usefully, to add frame(s) at the end of the stack. This makes the transition from sharp to blurred much more gradual, and out of focus background features become recognizable. If you mark your aperture ring so you can reliably set, say, 4 stops smaller, then you can increase the exposure by that amount.
Align the extra frame but don't include it in the stack. Re-stack it with the output image, afterwards. The reason is that in-focus details will appear in strange places, which you don't want.
Two uses -
#1) when you only need a small picture, perhaps 1000 pixels wide, so you can use a smaller aperture for more DOF. You wouldn't see the finest detail anyway.
#2) more usefully, to add frame(s) at the end of the stack. This makes the transition from sharp to blurred much more gradual, and out of focus background features become recognizable. If you mark your aperture ring so you can reliably set, say, 4 stops smaller, then you can increase the exposure by that amount.
Align the extra frame but don't include it in the stack. Re-stack it with the output image, afterwards. The reason is that in-focus details will appear in strange places, which you don't want.
Chris R