Google “DIY wavien collar” and there’s a thread on BLF about exactly that kind of stuff
There’s nothing that even comes close to a cold-mirror coated glass reflector though.
I would buy one, and probably also a quality 50mm lens, but I would have to know the focal length and if the lens has a small rim to clamp it behind a bezel (and if the 50mm is measured with or without the rim). And the price must be reasonable of course.
Possibly. I have not followed it well but has anyone measured the increase of throw of a dedomed SST-40 as opposed to one with dome on, and compared that to the throw increase of a XM-L2 ? Is it just as good? In other words: how good is the photon recycling effect in the SST-40? (the wavien collar uses the same effect).
Great Enderman, thanks for doing this! I want one, maybe two if the price goes down.
I have a few questions regarding lenses and the collar:
What f-number should a Lens have for optimal performance (meaning it collects all of the light and there is no wasted lens diameter)?
I want to put the smallest possible lens on top of a small sized collar. It should be possible to glue it directly on top if the diameter is just slightly larger or if the lens has a rim?
The mirror needs to be first surface, aka on the inside of the sphere, otherwise the glass will refract light and not just reflect.
I assume it’s about F1, they said it’s high precision quality and won’t be that cheap either, but no idea about the price.
I can ask about the dimensions and if it has a rim and all that stuff.
Yeah for sure!
Marinebeam said that the 60 degree output is perfectly suited for F1 lenses, numerical aperture = 0.5 Numerical aperture - Wikipedia
I prefer to think of it this way:
“the ratio of the (back) focal length f to the diameter of the entrance pupil D:
I actually also really want a compact EDC flashlight with a wavien collar
Since the collar is 32mm OD the smallest lens I would go with is also 32mm, since going smaller wouldn’t reduce the size of the light any more.