I'm slowly slogging through my lenses and objectives to test them on the FF A7Rm4. All my previous tests are on the HRT2i, except a few shift-image tests done on a few line scan lenses. Most coin photogs use APS-C, so for any test I do now I need to consider if the lens is useful for APS-C as well as FF.
A lens that I have been recommending for years for the "money shot" on the Lincoln Cent, and by extension as a good lens for a wide range of error and variety detail shots, is the Nikon M5. It is an inexpensive lens with excellent sharpness in the center, and decent in the corners of APS-C. It's main drawback is short working distance, but the nosepiece is removable and this gives a few more millimeters to work in lighting. These have been discontinued for a long time, and are occasionally available on eBay for ~$50, but the supply has been very sporadic.
Recently I've seen a bunch of Nikon E-Plan 4 objectives on eBay for reasonable prices. Today I see one for $36 and a couple for $39. These were supplied on the Labophot/2 series and it seems many of these microscopes are being sold for surplus, with the objectives suddenly available for good prices. This may be a symptom of the tech shutdowns around the world due to the pandemic, or just a retooling, I don't know. Cheap and good objectives are a nice result though.
I ended up buying a couple of Labophot-2 hulks on eBay for a great price. They each came with 2 objectives, the 4x and 10x, perfect for my purposes. I am finally testing the 4x and will eventually test the 10x.
Mag = 4x on Sony A7Rm4, single image mode. 12-shot stack of a Lincoln Cent mintmark. Crops of Center, APS-C Corner, and FF Corner. Working distance is
~17mm, significantly more than the M5.
My conclusion: I think this objective is an excellent alternative to the M5. It's not quite as sharp in the center but has better coverage, being useful on APS-C and almost useful all the way to FF corners.
Full image, downsized from 9504x6336 to 1024x683:
Crop Areas: Note the white box is the APS-C coverage
Center (Green box)
APS-C Corner (Yellow box)
FF Corner (Red box)
Quick Test: Nikon E-Plan 4
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Re: Quick Test: Nikon E-Plan 4
just for the fun of comparison this is from the Lomo 3,7x I sold.
Link to big file of a wafer, Lomo 3,7x on Sony A7Riv
and some other lenses on 5x
Laowa 2,5-5x @5x
Mitutoyo 5x
Link to big file of a wafer, Lomo 3,7x on Sony A7Riv
and some other lenses on 5x
Laowa 2,5-5x @5x
Mitutoyo 5x
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Re: Quick Test: Nikon E-Plan 4
I shot the same coin with the E Plan 10 that came with the microscopes I bought. The 10x objective shows more rolloff at the FF corners, but is still looking pretty good at the APS-C corners. Working distance is short, around 4-5mm, but its field is quite flat, and has sufficiently narrow DOF to give a very realistic 3D rendering:
Full Frame APS-C Crop 3D on FF
Full Frame APS-C Crop 3D on FF
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Re: Quick Test: Nikon E-Plan 4
My impression of most Nikon E and E plans has been that they are surprisingly decent for the money but I might need to upgrade that assessment.