The Shop > Tools
Anybody build Dan Gelbart angled laser centre finder?
Arbalist:
This one is only £5.20 and it says it has a Focusable dot of 2mm at 3 metres. Still 5mw though so probably too bright. I wonder what effect ND filters have on lasers?
http://www.ebay.co.uk/itm/Focusable-Dot-Laser-Module-5mw-Red-Laser-3-5V-650nm-UK-Seller-Free-UK-Postage-/321694174518?pt=LH_DefaultDomain_3&hash=item4ae6778d36
Update: I've checked the 5mw laser pointer I bought many years ago with some of my photographic filters. The ND2 reduces the output a little, the ND10 reduces it a lot, in fact far too much! A standard Polarisering filter reduces brightness only a little irrespective of rotation. A Circular Polariser reduces the brightness and is variable, depending on how the filter is rotated. None of the filters seem to effect the shape of the laser, which in the case of mine is an oval.
I've actually cut square resin filters on a lathe so if it comes to it, it should be possible to cut a small filter for the laser from one of these. I'm thinking an ND4 would make a good starting point. There may well be small filters for sale some where suitable for the job but I've not found any yet.
BaronJ:
Hi Arbalist,
Did you see my notes about salvageable lenses from dead CD drives ?
Arbalist:
--- Quote from: Baron on April 11, 2015, 02:55:26 PM ---Hi Arbalist,
Did you see my notes about salvageable lenses from dead CD drives ?
--- End quote ---
No, do you have a link please?
PekkaNF:
--- Quote from: Baron on April 11, 2015, 02:55:26 PM ---Hi Arbalist,
Did you see my notes about salvageable lenses from dead CD drives ?
--- End quote ---
I tried to find it, but could not find it.
I got this laser:
http://www.ebay.com/itm/121212852782?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
I was pretty sure 5mW would be to strong, but this was recommended. Soo....I have to check it.
I connected it to two practically emty AA batteries and aimed it to the wall. "Dot" was thin line, about 20 mm long. A little adjustment brought it round. It looked pretty bright - white wall, night outside, some normal living room lights.
Looks pretty bright and big spot on white surface, but then I tried black matte plastic and I was able to make sub mm near perfect round spot - so it seems.
This concept has it's merit and probably also some downside. Probably best to do some testing and see what kind of ecological niece it could have.
Pekka
Arbalist:
Not sure if it makes any difference but one guy is using a 3 volt CR2032 button cell to power his laser edge finder.
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