Hey ! maybe there is a lens that would work great as a exit lens for a BE mod ???I got some pretty cool lenses out of that Japanese TV camera zoom lens but it has several so I don't know if I will have the super powerful combination of just 2 lenses that I want, but I am going to keep looking.
Are yours scavenged or do you know the exact grinds you have, I have made about a 2.5X from a double concave and double convex, but looking at my Linos expander it seems we need some very aggressive aspheric front lenses as well as a pretty strong bi concave.
Binocular lenses will likely work but I like all my bino's, I could order some, the old K-mart focal were Japanese made and pretty good quality for the price.
I also have a spotting scope but I use it at the range, I could order an inexpensive one, a basic tube not a prism type. Galilean ?
My Linos is coated for 1064 and it is just wrong for the nubm44 corrected or not, it's a 2-8X but with the center relay lens it is made for small beams it seems and with the 1064nm AR coating I don't want to use any of the lenses.
Did you keep your same primary and just add a wider longer FL exit lens? I have thought of doing that with a sanwu 3X, use the primary and replace the exit with a wider longer FL on a sliding slip over that surrounds the host body.
Heck ya ! I wonder what the mag is ?I forgot about all my projector TV and projection TV lenses, did you know there were DLP TV sets, I have some of those optics too, no lasers they used the big projection bulb.
This piece is almost an expander just needs to be repackaged.
There you go, Now your cooking ! That should really increase your range ! Maybe you can have ElectricPlasma 3D print a BE housing setup ?I don't know, but I found some 2 inch PCX lenses that work great, that's flat on one side and convex on the other, I get an open flame on my wood panel target at 6 feet which is what the 3X can do when dialed in, this by the math should hold tighter further as my lens print is bigger and the FL from the 3X primary is longer.
I unscrew the output off the 3X and use the 2 inch PCX by hand, my cam likes to auto shunt, that's why one pic looks brighter.
This is with a NUBM44 and 3 element and 3X input, if I use this with a 44/G2/6X Cyl corrected/3X input then it will be quite the nasty burner.
By the time you get done you could end up doubling or even tripling your range with a home brew BE !It's out of a projector TV I think so it's likely VIS coated, answer is not much.
Here's a bigger aspheric, about 3 inches wide, from a projection TV optic, the outer lenses are acrylic but the center is a strong aspheric, I will have to try both on a 6X corrected beam.
Uncoated optics only lose 5% max IIRC
No, So far i've only used the output lens because the input lens from the JL BE is too small for the 6X cyl corrected beam......I have a bunch of these lenses, I can send you some, no money needed.
I will probably get EP to 3D print some holders for me.
Did you say you used the 10X input lens?
I'm going to grab some late dinner. bbiab
That's the same as i experienced ! Your right the trick is alignment for sure, The temp housing i made on the quick wasn't very good at the alignment so the farther away i checked the dot the more messed up it was but even so it still burned hot but i know once the alignment is much more precise the dot will straighten up and all the power will be in it ! Like i said before the flame was jetting out and somehow the dot was so intense there was tiny sparks flying out as well ! Even with my eagle laser safety glasses the dot was super bright, So bright i had to squint almost like i needed additional eye protection on top my eagle laser safety glasses and that was from across the room !I went down to my basement and the 3.25 inch aspheric works great with the sanwu 3X primary following a 3 element, the trick is alignment, just like holding a magnifying glass between the sun and the ground you have to be aligned, so as long as I have my laser firing straight then using a sliding lens holder will work, the spot is tighter and smokes the wood at 15 feet like mad, with the 6X corrected beam its just spitting a flame kernel like the wood had a natural gas leak on fire.
Correcting the aggressive axis 1st is still the way to go and I may still find a more fine tuned lens setup, but just the 3X BE after 6X correction makes a big difference, I still want a lot more power, but it's going to need to be focused as well.
I wonder how well the aspheric might work with the raw output? We would not have the 3 element losses if it fits the lens. Maybe a G2 lens but only focused to a wide beam slightly less divergent than raw output to custom tune the beam width to the larger lens.
More testing is needed, but so far the smoke and flames look good.