Infrared Conversion: 4/3 micro vs. Crop vs. FF sensor?

Started 3 months ago | Questions thread
Blueskyimages New Member • Posts: 2
Tamron 28-200mm f2.8-5.6 Di III RXD - infrared hotspots?

Hi nkistrup

I would really appreciate if you expand on your comment:

“Sony E mount: Know that the Tamron 70-180 & 28-200 play very nice w. IR. And the 17-28 & 28-75 probably do.”

I’m interested in the Tamron 28-200mm f2.8-5.6 Di III RXD on converted Sony cameras with 665 and 720nm. Is the lens clear of hotspots to at least f8 (ideally f11) in false colour - and is that all focal lengths. Haven’t found any other mention of IR performance.

Anyone else tried this one in IR?

FWIW - just got hols of a Sony 200-600 and initial tests suggests it has no hotspot up to f8 right across the range - and then very mild from f11 onwards - which is surprising, I didn’t expect that.

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