Testing a Nikon CF Plan 50X 0.55 EPI ELWD (Butterfly Scales)

[Noah212]

I tested the Nikon CF Plan 50X 0.55 EPI ELWD mounted on a 200mm f/4 Sakar lens on my Canon 60D.

74 photo stack at 0.00033mm (1/3 micron) increments.




100% crop:



My initial impression is extremely positive. The CA isn't nearly as bad as with the Nikon M Plan 40x. I'll post more images when I can find a more interesting subject.

To see more of my butterfly scale photos, click here.

[rjlittlefield]

I like that objective a lot. Sometimes I push it down to 25X with a 100 mm tube lens. See for example http://www.photomacrography.net/forum/v ... hp?t=16216 and the followup at http://www.photomacrography.net/forum/v ... 825#103825.

--Rik

[shrek]

Hi
How make you to make 1/3 of micron ?
thank

jp

[jotafoto]

This calculation is wrong. With this lens on a Canon 5D Mark II 50X cuts have to be 1.7 microns with 30% overlap
And I have both lenses and I like plus 40 ELWD

regards

[dolmadis]

Hi

To clarify for me please, if I may.

(Just so I may test my learnings or learn some more !!)

Is this an infinite objective on a tube lens?

Thanks


John

[rjlittlefield]

Is this an infinite objective on a tube lens?

Yes, assuming that Noah212 has the same lens I do. In "Nikon CF Plan 50X 0.55 EPI ELWD mounted on a 200mm f/4 Sakar lens", the Sakar is serving as tube lens.

This calculation is wrong. With this lens on a Canon 5D Mark II 50X cuts have to be 1.7 microns with 30% overlap

Or 1.29 microns for 1/4 wavelength aberration at 390 nm visible light (DOF=lambda/NA^2).

In any case, shooting steps finer than necessary has no great harm, and it allows to easily find out what steps are necessary, by reprocessing the stack with skip factors 2, 3, 4, etc.

--Rik