Staurastrum gracile fission

Olympusman · Post by **Olympusman** » Tue Oct 03, 2017 10:50 am

Staurastrum gracile fission

Jacek · Post by **Jacek** » Tue Oct 03, 2017 10:58 am

Nice

Olympusman · Post by **Olympusman** » Wed Oct 04, 2017 7:39 pm

Thanks. Just out of curiosity I stopped down my Olympus OM series 50mm relay lens down to f5.6 ( nearing the sweet spot of f8) to see if I could get some better definition. I will see how that goes.

Mike

Sumguy01 · Post by **Sumguy01** » Wed Oct 04, 2017 8:53 pm

Interesting.
Thanks for sharing.

Pau · Post by **Pau** » Thu Oct 05, 2017 12:19 am

Your second image does show more contrast, is it due to the relay lens stopped down?

Just out of curiosity I stopped down my Olympus OM series 50mm relay lens down to f5.6 ( nearing the sweet spot of fCool to see if I could get some better definition. I will see how that goes.

I assume you're doing afocal. In my experience stopping down the camera lens just improves a bit contrast, past a certain point (F8 with the OM50mm 1.8 in my system) it just vignettes. The lens doesn't act like in normal photography, its diaphragm acts more like a flare cutting stop, in certain sense like the microscope field diaphragm