Haven't posted here in a long time, but I thought this might be worth mentioning. I had a surplus lens doublet sitting around for the longest time, and given some other stuff it came with, it most likely is from Edmund. I just tried this as a tube lens, swapping out my Raynox 150. I didn't run any scientific tests, but subjectively it looks just as good or even better than the Raynox. Below is an example of a poppy seed taken with the Mitu 20X and the doublet.
Edmund (?) 175mm doublet as tube lens
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Didn't have a butterfly wing or a silicon wafer around, but I run a more systematic test with a bank note (of non-US origin). Used the 10X Mitutoyo (it's sharper than my 20X) this time, but illumination etc. was all identical.
The below images were stacked in Zerene and sharpened in Affinity (same parameters for both of course). Also, the Raynox image seemed a bit dimmer (exposure times were the same for both stacks), so I made a slight brightness adjustment to account for that. Also had to apply some jpg compression to account for the file size restriction.
The doublet still appears a tad sharper, I'd say:
The below images were stacked in Zerene and sharpened in Affinity (same parameters for both of course). Also, the Raynox image seemed a bit dimmer (exposure times were the same for both stacks), so I made a slight brightness adjustment to account for that. Also had to apply some jpg compression to account for the file size restriction.
The doublet still appears a tad sharper, I'd say:
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I think the raynox edges here. The doublet yields more contrast though which appears to be sharper, but for fine details, I see a bit more in the raynox.
That said, as I recalled correctly, the Raynox is an f=208mm lens while the EO achromat is 175. NA stays the same, so the EO should give decent sharp centres. It's at a lower magnification however. Equalising the two seems to yield identical outcomes. I definitely will not be able to tell between the two in a true blind test.
What's the part number for the EO doublet? I have a cabinet of those, could run a test on them all.
That said, as I recalled correctly, the Raynox is an f=208mm lens while the EO achromat is 175. NA stays the same, so the EO should give decent sharp centres. It's at a lower magnification however. Equalising the two seems to yield identical outcomes. I definitely will not be able to tell between the two in a true blind test.
What's the part number for the EO doublet? I have a cabinet of those, could run a test on them all.
Not sure about the part number, as this came out of some surplus pile, so I can only speculate that it's this one:
https://www.edmundoptics.com/p/25mm-dia ... lens/2670/
Part #32-884; they also have a 200mm version of this doublet btw.
Looking forward to the results, if you run tests with yours.
https://www.edmundoptics.com/p/25mm-dia ... lens/2670/
Part #32-884; they also have a 200mm version of this doublet btw.
Looking forward to the results, if you run tests with yours.