Exact spec of lens27

[edison]

Any progress on the good lens? I would like to finish my quad In fact 3 people that have my brass block would finish theirs too

[badger1666]

Any progress on the good lens? I would like to finish my quad In fact 3 people that have my brass block would finish theirs too

hey edison good news / bad news

dave got these lens but they arsed up the making of the lens retainer
so he is waiting on a part to be re-made for the m9 x.5 retainer
now for the bad news these lens need very accurate placement over the
diode to give the said great beam and need a special diode mount to do this
he also has these made thats as much as i know at the moment

happy new year

[edison]

Thanks badger. If the lens from simon and dave requires a special mount then its no good for me. I do,nt want to go to the whole process of redesigning my whole setup again. The last and final desingn will be the smallest that is possible with the design that i have now. I donated a setup to Daniell briggs to workout some telescopes for my design. With more then 4 its more profitable and easier to use a telescope.
At this point i,m not entirely sure wich road i go but i already ordered 40 7020H lenses from Roithner to go i the 8 setup. But that needs a telescope. I asked daniel to work out 3 different telescopes so that i have telescopes to test on my setups.

Hopefully the lenses from Dave and Simon would be suitable for my setups

[badger1666]

Hi edison
Do your mounts allow you to move the diode around
A tiny bit ?
You should still get a sample lens they may well work in your setup.
Dave just said they would not work with his gb mounts

[dave]

Indeed, these lenses I have give a spot size at aperture of about 1 x 1.5mm with about 1 mrad divergence, however the catch is the diode's position relative to the lens needs to be tweaked to stop artifacts around the main beam.. I guess it's a inherant issue with any lens with such a short focal length..

I have all the hardware to achieve this here, however there was a bit of a issue with one of the parts.. Rather than wait another few weeks for a replacment part, I made up a jig to allow me to remachine these bits without too much pain.. After remachining, it is pretty easy to get a very nice beam profile.. Hopefully I'll have all the bits tidied up in the next few days :-)

Once I get a chance, I'll take some pics and post them here :-) Chris, I bet your itching to see ;-) I'll try to get some pics later today :-)

[dave]

and some pix.

The diode housing block has been made with mounting holes in the bottom, and also the top. If its mounted one way, beam height is 9.5mm, and the other way, the beam height is 10.5mm. Mounting holes are M3..

Beam shots kinda over saturated my poor camera, but they give the idea I hope. The spot size is smaller than what the pics show

Don't think there's much else to add. The retainer has a threaded insert to clamp the lens in place, and there is very little slop in the m9,0.5 thread, so the lens retainer doesn't move around much if at all..

I guess the next step is to build up some red modules now Think I am going to start off with 6 of these in some modules, but there is talk of Mr. P1t8ull going bananas and knocking up some 12 diode modules! Stay tuned!

[andythemechanic]

Hi,

Dave, I am very interestend in this lens. Can you specify the focal length and NA please?

Happy new Year!
Andreas

[RedlumX]

roithner have removed the lens27 from their web site.

does anyone know the exact spec of the lens27?

cheers

From the Lens-27 data sheet:

• very high efficiency
• f = 3.6 mm
• N.A. = 0.45
• 1 glass lens, AR coated
• designed for 633 nm ± 30 nm
• dimension 11.7 x ∅ 9 mm, M 9 x 0.5 mm
• black aluminium
• divergence: 2 mrad

[dnar]

Dave, Drill press on stacked milk crates? WTF? OH&S, I spotted the hazard, does this mean I am responsible for mitigating the risk?

[dave]

Hi Andreas,

Focal length is 3mm, NA is 0.5

Hope this helps

Hi,

Dave, I am very interestend in this lens. Can you specify the focal length and NA please?

Happy new Year!
Andreas