Only up to 10°. At very close range this 10° with its rectangular tight spill already creates some artifacts, the 5° will be worse I guess. The narrow spill is very useful in cases such as mouth or nostril inspection where you don’t want too much glare to the patient. I myself prefer the 20°. The stock optic has bad yellow tint shift ring around the hot spot.
I have tunnel vision, field of view well under 10°, so I’m always on the lookout for lights that put all the light where I can use it. 10° would still be pretty good, though
UPDATE181221: Maukka calibrated Jetusolis
If you guys interested to make a calibrated light using this Jetusolis, you can ask Maukka and check this thread:
The pricing for Jetusolis:
1 - 3 pcs = $28,5/pc
4+ pcs = $27/pc
Of course if you don’t need the data, just order from Clemence when he makes them publicly available in his store. No reason to include an extra step in that case.
Any chance of buying a couple of those 20° TIR optics from you?
It’s pretty hard to find something decent in that size via the normal pleb channels…
Or maybe you got them from Yajimei?