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bond19

Green Laser Pointer on 20x80 Binoculars

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personally I'd be real careful of aiming a laser into the night sky. You could fit a RDF tho if you can find a suitable mounting, one of the riflescope types may work tho I can't say I've ever tried given mine are wider angle than a 20x probably is.

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Celestron do a RDF rail that clips onto the central bar for their Skymaster Pro series. If you do go the GLP route, probably the best way is a weaver or picatinny rail and a GLP gunsight. (Not exactly sure how to fit the rail to the bar, though - but you can get them with all sorts of barrel adaptors.) 

 

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5mW max, buy from a reputable Astro company and you should get the power you ordered (I bought from a more mass market eshop and got 10x the power I wanted!)

given you only need to use one of these for a few seconds, assuming that the   Centre rail is pointing where the bins are and assuming the laser direction is aligned to the housing of the pointer, the simplest would be an “X” shaped widget that rests on the rail and the laser rests on, so they’re aligned.  Easy to design and 3D print.m, what diameter are the rail and laser?
I have tripod mounted 70mm angled bins with a “?weaver rail”, which has a small v-groove in the middle. I just rest the pointer in the groove, short laser bursts to help me point the bins where I want them, then the pointer goes back in the pocket (they don’t like the cold much). This will get you close enough, especially if you’ve use lower power bins to understand better where you want to point.

Peter

 

 

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Hi Chris,here is a low cost but effective way of mounting a red/green dot finder.

B + Q  pipe clips araldite and a nut and bolt,cost app £1.50

Mike

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I use a laser pen on my bins on the homemade binocular mirror mount and discreetly. We might as well ban kitchen knives too if lasers pens are regarded as a bad thing. We are not the types who point lasers at aircraft.

A problem I have with laser pens is finding one that doesn't wilt in cold weather. Can anyone recommend a good supplier? 

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1 hour ago, Merlin said:

I use a laser pen on my bins on the homemade binocular mirror mount and discreetly. We might as well ban kitchen knives too if lasers pens are regarded as a bad thing. We are not the types who point lasers at aircraft.

A problem I have with laser pens is finding one that doesn't wilt in cold weather. Can anyone recommend a good supplier? 

Hi Merlin. The key word here is 'discreetly'There are idiots who misue anything and we all suffer for their stupidity.
But if you use an appropriately powered pointer correctly, nobody notices it.

All the laser pointers I have seen are essentially 'room temperature' devices. When chilly, they increase their intensity over several seconds as things warm.
I haven't had one outside on a cold night for long enough to establish operating limits.
Just arrange a watt or so of heating and put a bit of insulation around the pointer, leaving just the switch and shiny end exposed of course.
A decent size powerbank will keep the package warm for the evening. But maybe you already have a decent size battery for anti dew on your binos and mirror?

HTH, David.

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The bins don't dew up David, as the y point downwards to the mirror. I've found that it's the diode that's sensitive, at about 5C, rather than the batteries. 

If I cover the diode for a short time with a fingertip to give it some heat, it comes on but only for a couple of seconds or so. There are laser pens that can take quite a lot of cold before wilting, it's just knowing from where.

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Keep them in a pocket and only take them out when you need to... or activelynwarm them up as suggested. Remember tonuse lithium batteries.

Peter

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