I’m still learning the pros and cons between TIR vs Aspheric. mcorp has provided some explanation of the difference: “Better water resistance……. at the cost of loss of throw (in SPOT mode)”
I believe another charistic is a round spot beam when fully zoomed in (instead of a square one showing the die image) but I think that can be achieved in an aspheric by stopping the travel slightly short of full (Wowtac A3S for example) He also mentioned another brand that used this setup was Fenix FD series, I’m wondering is this the same as what Led Lenser employs?
In another thread, in a discussion of Led Lenser clones someone posted this description of the beam for (genuine) Led Lenser optics :
“A nice round spot with no spill and almost perfectly uniform wide-angle spill that the real TIR does.”
However I’m not sure if Led Lenser is using something slightly different than these FiTorch and Fenix TIR.
For the FiTorch I have to wonder if their use of this TIR was worth it compared to using Aspheric.
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What flashlights have the Lenser / fraen partnership optic? Is that what the Led Lenser uses? I’ve been looking at some Led Lensers, the MT10 and MT14.;
Those and the and MT18 appear to be the only models they make that run on popular size Li-ions (18650 / 26650)