Labradorite, via Nikon 10x + Mamiya 210mm

phreakocious · Post by **phreakocious** » Sun Mar 27, 2011 6:49 pm

I'm pretty impressed with this medium format as a tube lens. I don't notice any vignetting until stopped down to f/11.

Nikon CFI Plan 10x microscope objective
52mm->M25 step-down ring
58mm->52mm step-down ring
Mamiya 645 210mm f/4 (as tube lens)
Nikon F->M645 lens adapter
D7000

Full image:
http://farm6.static.flickr.com/5133/556 ... 296b_o.jpg

phreakocious · Post by **phreakocious** » Sun Mar 27, 2011 7:24 pm

Not the best "rig" ...

Pau · Post by **Pau** » Tue Mar 29, 2011 10:39 am

very nice labradorite images, in special the colors of the fist one!
At first look it didn't seem shot with a microscope objective, in fact it looks very similar to a had sample I had sometime ago.

JW · Post by JW » Tue Mar 29, 2011 11:04 am

phreakocious

Would not have thought labradorite would be so interesting...

To think I sold all my 645 stuff years ago, could have used the 200mm for a tube lens rather than my 75/300 zoom. Maybe I will look for a used one...

Jeff

phreakocious · Post by **phreakocious** » Tue Mar 29, 2011 4:41 pm

JW/Pau,

Thanks for the feedback! It seems the trick to catching the 'labradorescence' comes down to the structural properties of the specimen, and its angles to the light source(s) and camera. This particular piece can produce some even more eye-popping colors, but getting all of those variables right is no easy trick.

I was hoping that extreme macro like this would help overcome some of that, and it's somewhat true. Just need some of those goniometers like Chris S. has! =)

I'm very interested in opinions on how well the Mamiya lens is performing in this configuration. If anyone has suggestions on things I can shoot that are good for evaluating that, aside from calibration slides that cost $100s, do tell.

Cheers!

rjlittlefield · Post by **rjlittlefield** » Tue Mar 29, 2011 6:28 pm

phreakocious wrote:If anyone has suggestions on things I can shoot that are good for evaluating that, aside from calibration slides that cost $100s, do tell.

My favorite is moth wings. See for example HERE.

--Rik