Black ant from LOMO 10X APO

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georgetmacro
Posts: 37
Joined: Mon Sep 18, 2017 10:12 pm

Black ant from LOMO 10X APO

#1 Post by georgetmacro » Fri Nov 17, 2017 8:56 am

Black ant ... still testing the LOMO 10X APO
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2017-11-17-17.41 MicrobeHunter.jpg
2017-11-17-17.41 MicrobeHunter.jpg (160.2 KiB) Viewed 3277 times

MichaelG.
Posts: 3976
Joined: Mon Apr 10, 2017 8:24 am
Location: North Wales

Re: Black ant from LOMO 10X APO

#2 Post by MichaelG. » Fri Nov 17, 2017 9:32 am

That looks very promising indeed !!

Some technical details of the set-up would be appreciated.

MichaelG.
Too many 'projects'

georgetmacro
Posts: 37
Joined: Mon Sep 18, 2017 10:12 pm

Re: Black ant from LOMO 10X APO

#3 Post by georgetmacro » Fri Nov 17, 2017 11:39 am

MichaelG ... The so-called technical details are quite basic actually. I just used the LOMO 10X lens on my Olympus CH microscope ... I had to use a 7mm mounting spacer so as to get the objective to focus because the operating distance is different to that of the standard Olympus objectives so the magnification is obviously a little out. I also did not use the eyepiece in the home made camera mount tube. The olympus has a fine adjustment of 2.5um per marking on the dial and I used 8 points so 20um per exposure at 1/5 sec each... I think it was 52 images (Nikon D200) in total from memory. The lighting is from a 150 LED circular light source of I think, 8 watts (nothing marked on this LED fitting) mounted around 20 mm above the subject. The first time I tried it on this subject it was on a white card but this seemed to create too much light reflection back on the subject reducing the contrast dramatically so I changed the background to the blue color. I choose not to use live view on the D200 as it involves complications that I am not familiar with ... I do have a D300s that works with no other software on the Nikon live view control software but I prefer to use the D200 as a photo-microscopy dedicated camera.

MichaelG.
Posts: 3976
Joined: Mon Apr 10, 2017 8:24 am
Location: North Wales

Re: Black ant from LOMO 10X APO

#4 Post by MichaelG. » Fri Nov 17, 2017 12:30 pm

Thank you ... that clarifies nicely.

The main reason that I asked was because I could see no reference to an eyepiece.

>> It is now clear that you did not use one ...
I also did not use the eyepiece in the home made camera mount tube.
... which makes the performance of the objective all the more impressive.

My Zeiss 4x PlanApo has a lot of 'chromatic difference of magnification' when used as a simple macro objective, and really needs a compensating eyepiece. ... That LOMO appears to be almost completely corrected.

MichaelG.
Too many 'projects'

Francisco
Posts: 625
Joined: Sun May 28, 2017 11:23 pm

Re: Black ant from LOMO 10X APO

#5 Post by Francisco » Fri Nov 17, 2017 3:21 pm

Very interesting. Thank you

georgetmacro
Posts: 37
Joined: Mon Sep 18, 2017 10:12 pm

Re: Black ant from LOMO 10X APO

#6 Post by georgetmacro » Fri Nov 17, 2017 11:32 pm

MichaelG ... yes, the LOMO APO seems quite good. There is absolutely no modification to this image notwithstanding a couple of spots that appeared on the background due to exaggerated specs of dust on the ccd that I fixed with the rubber stamp in a generic image (PhotoFilter) program.

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