I can perfectly focus all my domed LEDs, but the dedomed ones always leave blue/orangeish squares/lines around the hotspot!
it kinda looks like this:
I am not able to post beamshots because my phone camera just registers everything as a white dot.
the domed ones look nice and perfect like this:
Emitter in question: xpg2
Lens used: 44mm Aspheric
I also covered around the emitter with black tape, I did not cover the metal around it however. In addition, the host holding the lens also has black tape, so there are minimal internal reflections.
Light is perfect in a reflector. Perfectly round. But once I switch to the 44mm lens, those squares start to appear. I have 2 xpg2 dedomed and they both have funny squares. I also have 2 44mm Lens and they both show squares.
I am not able to focus the till I see the dots on the LED.
Maybe both my lens just sucks… hmmm
EDIT: I FIGURED IT OUT! I had some small plastic lens and I tried using that and BAM! goodness gracious! the perfect square!!! I guess my glass lens is grabage. D: any suggestions on quality glass lens? I got mine on ebay for like $2.50 USD 44mm Lens - EBAY
I guess domed emitters are easier to focus with crappy lens
PMMA lenses have been better for me than glass lenses. But then I never bought expensive ones. So maybe I should say that as far as budget lenses go, PMMA has been better for me.
I drew them myself, and I exaggerated to show what is happening.
I know exactly why this is happening.
I used the lens to magnify a straight line on a piece of paper… I moved the lens across the paper and there were ripples/waves
The lenses at fasttech look fishy… can anyone confirm if they are good?
I really haven’t used it much, but here’s what I can tell you: the FL is a little long when used in a Maglite. You must either move the heatsink back a good bit more than normal or you must screw the head out until it’s about to fall off. The lens is a little loose, you need to make a ring to snug it up inside the bezel. Someone here suggested just using the edge of a stock lens, but I haven’t gotten around to that yet.
Wow, apparently I don’t have much to say about it. To be honest I put it on an old SSC P7 modded Maglite (P7 looks stupid under an aspheric) just for laughs. I’ve been meaning to do something more productive with one but haven’t gotten around to it.
I have a feeling that a little scrounging will give you a similar item. It’s just a short tube with a step at the top, similar to a plastic desk grommet. I think you want approximately a 47-48mm ID on the grommet’s tube, then you’d grind/cut down the flange until it fit inside the bezel. (and trim the length until appropriate)
Looks like VOB used plastic tube with an appropriate ID and turned down the OD.
