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Grenache wrote:
Cursed with morning low lying marine layer and afternoon blank sky, I did not have ideal conditions to check out the 35GM for landscape and architecture shots today. However, the conditions were fine for putting it through its paces in infrared. Sony lenses, the GM line in particular, have not been friendly to infrared historically, the 24GM being quite good at 590nm and below and the ZA 16-35/4 being exceptions.
I was delighted with the performance of the 35GM at 590nm as well as with the Kolari IR-Chrome filters. No hot spots at any aperture (YAY!!!...surprisingly tough to find in a 35mm lens). At the more challenging 720nm filter, it was fine through f/8 with essentially no hot spot. At f/9-11, you pick up a little diffuse one, easy to correct. Between f/13 and 16, there is a real but small hot spot (see below) but still likely in the realm of correctable without high skill level.
While no one is likely to buy this lens for this particular feature, the 35GM handily outperforms the 35ZA in IR and is also far better than my beloved Zeiss ZE/ZF 35/1.4 in infrared.
Jim
Sony a7iii full spectrum + IR-Chrome filter @f/1.4
https://live.staticflickr.com/65535/51122079993_34118aa5cc_o.jpgChrome Current by Jim, on Flickr
https://live.staticflickr.com/65535/51122079978_bff546bfeb_o.jpgIvy interest by Jim, on Flickr
Sony a7iii full spectrum + Hoya R72 (720nm) @ f/1.4
https://live.staticflickr.com/65535/51122174326_8ddb278f0a_o.jpgInfraflow by Jim, on Flickr
Sony a7iii full spectrum + Hoya R72 (720nm) @ f/16
https://live.staticflickr.com/65535/51121919864_5e8a1860b5_o.jpgSony 35GM 720nm f/16 hot spot by Jim, on Flickr
For this one, ignore the concentric rings, as that is a flare issue with my inability to use a hood with the filter configuration I have. I have MASSIVELY accentuated the contrast (LR contrast = 100) to make the hot spot more visible. It is pretty marginal...even at f/16...Show more →
I for one, really appreciate this info. I have a full spectrum a7r pretty much relegated to IR Chrome use, so it’s good to know that this lens performs well for that task. I was sort of disappointed by the 24 GM for IR Chrome, its very well centered on my a7r4 but weirdly not centered shooting in infrared (none of my other lenses show this same tilt).
Another lens I’ve found to be excellent for IR Chrome is the 28-60. Still maintains the sharpness it has on visible light, and I didn’t have any hot spot troubles. Much lighter than any legacy primes in the range and I’m sure it’ll outperform them in many cases
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