Thorlabs 2x Superapochromat on eBay

[Macro_Cosmos]

https://www.ebay.com/itm/184513950499
First time seeing one of these. 2x with an NA of 0.1 for VIS.
Thorlabs even claims it's good for DIC? Do they have a specifically designed normaski prism for it?

Their 10x is incredible. 0mm to 0.21mm optical cover glass correction collar, a whopping NA of 0.5 and optimised for VIS-IR. Would love to try it.

[Scarodactyl]

I saw that, though only for 200 less than retail. Certainly a series I'd like to see explored, though for my swtup a mitty 2x was quite cheap and is good enough.

[Lou Jost]

Is the size of its image circle known?

[Scarodactyl]

Fn is specced at only 22mm, though whether that is pessimistic (or optimistic) is an open question.

[Pawel]

Nikon PlanAapo 2x/0.10 has 25mm (OFN25), but the corners image is weak

[Scarodactyl]

The olympus 2x/0.8 planapo seems like it would fit a similar niche as well, and I think it's rated for 26.5mm(?). It certainly covered UW eyepieces just fine visually, not that that necessarily means anything. I have one, I should do some better tests with it. That being said, it doesn't come close to the nice 53mm(!) working distance of the thorlabs, which should be parfocal with mitutoyo objectives and friends.