Mercury Hg lamp spectrum lens test - Viltrox EF-M2 ii SpeedBooster

[Dmitry]

Gear used:

Olympus e-m5 body full spectrum converted myself.

Lomo T-43 triplet lens.

Viltrox EF-M2 ii (updated revision 5 elements in 4 groups)

ZWB3 2mm filter to hide visible light

 

Lines reference in index sticky - lines

Left green line is 334nm

Middle orange line is 365nm

Right blue line is 405nm

 

iso 200, 60s, f/4 processed in xnview from ORF without white balance changes

 

I made two photos using same exposure time, top half is bare T-43 lens, bottom half is with SpeedBooster between spectroscope and lamp.

 

Note increased brightness with SpeedBooster and missed 334nm line.

 

Сonclusion - Viltrox EF-M2 ii SpeedBooster is at least 365nm capable.