That's in agreement with wikipedia
Reflectance of 0.5% implies transmittance of 99.5%
0.9952 = 99.0%
I wonder if DX lenses perform as well.
Worthy of a comparison test?
Cheers,
Angus
Reflectance of 0.5% implies transmittance of 99.5%
Not at all, it is a very practical test, in that it tests one variable, the effectiveness of the anti-reflection coating. All other things, lamp-meter position in particular, remain exactly the same. In science it is always preferable to change one, and only one, variable at a time.
Another excellent wiki article is at http://en.wikipedia.org/wiki/Anti-reflective_coating
It explains how the transmission of light through an air-glass interface is enhanced by destructive interference of the light that would normally have been reflected if the quarter wave thick coating were absent.
Hope that last sentence makes sense to you. It's past my bedtime.
Cheers,
Angus
Actually, it does. But of course enhanced by the six pack of excellent local micro-brews been thoroughly enjoying tonight.
Tomorrow morn will probably have no idea what you, or I, were discussing.
Cheers my friend, Tom
My glass needs replacing .I like my light . I’m tired of garbage .I want more output too .4 more good reasons to buy good A/R glass…
Don ...easiest answer is quit smoking ..think of the time you'll save cleaning .AND Your lights and your teeth will be brighter .
Even the dog has more sense than to stand downwind from a campfire .
Sorry guys for bringing back a deadthread but for those of us who are interested in upgrading our lights I want people to know that KD is still selling the AR lenses and I just bought a few of them (6) for testing purposes. I mean having a Bushwhacked P60 Drop in deserves a nice AR lens right? Right! I can post the link to the 28mm ones if anyone else is interested in one for their light. Mine happens to be a Solarforce L2 and, from what I have gathered, the KD 28mm fits nicely.
The real gains come when the light is hot rodded. And the best gains come from the flashlightlens.com UCL and UCLp.
I don’t know if the KD lens give any appreciable boost in output, but they sure look nice, and to be honest that’s the only reason why I bought them. :bigsmile:
I think there is a thread here on blf that compares different lenses for p60 format, the light gained using a KD lens was around 5-6% the lenses from flashlightlens were even better.
I wasnt really looking for a huge boost in output though im sure anythings better than what it came with. also I wanted the look as well! It sure looks sexy with an AR glass.
Let us know what you think. I also ordered some lenses from KD. I ordered the ones that go for $3.10 rather than the ones for $2.9x. The KD website said the more expensive were the ones to get so I believed them. I don’t like glass with tint so I
may be disappointed, expecially if I can’t see a difference in OTF lumens.
Unfortunately, KD even with the registered air mail is terribly slow. I order from other Hong Kong companies and receive their stuff in 8 days. But KD has had my order for 13 days and it just left HK and I still can’t track it.
Im not sure if i will be able to tell. My Bushwacked LED should be in before the lens so hopefully i can get some output shots up and some lux readings from my phone lux meter. I will do a stock glass kd glass and no glass reading. Also can you send the link for the lens you bought? Thanks
I bought those exact ones! I just bought 6 of them…
I had planned to buy these http://www.kaidomain.com/product/details.S021820
which I thought were the ones everyone had been talking about in these forums. Then the slightly more expensive ones ($3.10) showed up on their website with the info on their page that said these were the best so I ordered them instead.
For what it’s worth, I ordered two different 28mmx2mm lens from KD a little over a year ago, and one type had a “green” AR coating while the other had a “purple” AR coating. Both types were flawless; they perfectly matched the diameter and thickness of the stock lens, and I couldnt perceive any tint shift between the two. I’ll try to find some links to them tonight.
One thing I notice is that many of these sites seem to carry each others merchandise with a slight mark up. So I can never tell when I am buying from the original vendor and when I am buying from a wholesaler or middle man. I did a search on Alibaba and found a very similar coated lens that sold for $2 each and I thought had the letters KD somewhere in the description. But it seemed too complicated to buy and unsure of shipping, etc plus they didn’t take paypal.
I found this post very helpful lenses bezels etc compared Many thanks to lilkevin715 for the effort put into the review.
For what it’s worth I ended up buying the Kaidomain AR Lenses 28mm x 2.0mm as best value for me. They are supplied in a air-lite packet wrapped individually in bubble wrap then taped on each side so you can drop them into the Solarforce host easily without touching the lens at all. I’ve replaced the standar lenses on all my Solarforce heads/bezels.
Can you see any difference from the plain glass in the OTF lumens? Did it change the tint of the light at all?
The 3 KD AR lenses arrived. I can’t tell by looking at them that there is a coating on them. I did hold one up to a light and if I wiggle the lens a little I think I can see a little blue or green reflection but it isn’t a full tint on the lens. After installing one it look totally clear when I stare into the head of the flashlight (light off of course). I can’t perceive any more light coming OTF. The only difference I can detect is the hot spot is a little less defined on the XM-L drop in (SMO reflectors) with the AR lens than it was with the clear lens. I would have thought it should be more defined with the AR lens.
I’ll install the other two tomorrow and see if there is any change in my other flashlights.
I
You aren’t supposed to be able to perceive the difference, so that’s fine.
(Ignoring what you mentioned about the hotspot that is. I’d check that your reflector is snugged onto the pill)