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Hi there, new to the forums here, please forgive me if this is posted in the wrong section. I have been looking for a good 28mm (near 35mm equiv.) lens for both IR photography and B&W once I sell my full spectrum modified Olympus. After researching a while I have come down to these three options; Ultron 28/1.9 = Good low contrast B&W, IR?? Biogon 28/2.8 = Not so good B&W (higher contrast) but good IR Summaron 35/3.5 (Not 28mm I know) = Good B&W and apparently good for IR (due to coatings) The Ultron seems ideal for my needs except there is very little information on its use for IR. Can anyone confirm whether it is sharp in the spectrum or suffers from hotspots at certain apertures? Samples would be great to. The Biogon has IR focus marking which would probably make my life alot easier except I've heard its not the best for B&W, unless some samples convince me otherwise. For IR it doesn't suffer any hotspots according to the guys @ getdpi. If I can see more IR action (samples ofc) from the Summaron I might be sold. Although a filtering solution for this lens seems like a pain, if anyone is using this for IR how have you gone about with it? Just using the SOOGZ adapter? Any samples of the three in b&w and IR are greatly appreciated! If there are any other possible lens options apart from those 3 that I should consider, please let me know also. Thanks for the help