LOMO Microscope Objective - APO 40x0.95 CGCC, defective

Description

LOMO Microscope Objective - APO 40x0.95 CGCC, defective
We have three such objectives, and all of them are defective:
#69123 - green oil/dirt spot on the glass. Gover glass correction collar rotates freely, without actuating internal mechanism.
#71206 - CGCC work fine. But there is a yellow oil/dirt spot on the glass and glass separation (delamination).
#860442 - CGCC work fine. But glass has scratches and crack. Image quality will be lower than it should be.
These objectives are rare, so I'm setting average price for them. May be some of them will be worth cleaning and/or reparing.
The price is for ONE objective. Please specify serial numer of the one you want to get. Or contact me with offer on all three together. Thank you.
Objective code
OM-16
Mount
0.8″-36 (RMS)
Tube length
160mm
Cover glass thickness
0.17mm
Magnification
40х
Numeric aperture
0.95
Focal length
4.40mm
Immersion
Dry
Work distance
0.12-0.22mm
Parfocal height
33mm (RMS)
Image size
18mm
Correction
Apochromat
Light
Mixed, bright field
Spectrum range
400-700nm
Research method
-
Contrast method
-
Other features
Cover glass correction collar
Mount thread:
RMS (0.8"-36tpi)
Correction:
Apochromat
Magnification:
40x
Numerical aperture:
0.95
Focal length:
4.40mm
Tube length:
160mm
Work distance:
0.12-0.22mm
Parfocal height:
33mm
Special features:
Cover glass correction collar
Purpose:
For biological, bacteriological and other researches