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  1. #41
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    Maybe you guys can educate me in this regard. What's the big deal with the Jasper ? I would imagine all decent quality lasers are about the same, as long as they guarantee a certain IR filtering, glass lenses, APC instead of ACC and a good quality battery.

    Is it the switch that is so preferred by astronomers ? I personally use the laser for 2 to 5 seconds at a time, I never leave it on. Would that be a pro of the Jasper ? Or the swivel is a lot better than other stiffer mounts ?
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  2. #42
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    From what I gather, the early GLP's were really expensive, costing like several hundred dollars but because of mass production in China, the cost has gone down really low, like there are units in ebay in the $10-$20 range (I got myself one of these, and it works fine) which reviews have it as being good enough to do the job. Some are duds but generally there seems to be a consensus that they work fine. I think the quality made ones have the advantage of possibly being more cold resistant, an important aspect if one is going to use the unit in really cold weather; (here, where the climate is warm all year round, I have no problem at all with the cheap GLP's, I picked one up in a Beijing flea market and another one at ebay and they both perform very well with no problems of thinning out.) When the GLP is affected by the cold, the green ray is reported to become really thin until it is not visible anymore. It is said that all GLPs in one way or another are affected by cold weather, but some more than others, so I suppose this resistance to get affected by cold weather is what makes some pony up more $'s than the cheap ones. But I have yet to hear from one who has an expensive GLP compare it with a cheap GLP and categorically say if the price difference is really worth it, I hope to learn from others too who've tried comparing the two units from extreme price points. Having an always on option is a nice touch (bumping the cost upward), freeing one hand from having to hold on to the switch which may also affect alignment a little bit - almost all cheap GLP's have the spring-type switch which turns off once released.

    Best,

    Hernando
    Last edited by ibase; 12-27-2010 at 07:50 AM.

  3. #43
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    I have cheap generic lasers, and also this one. (illegal in the states) DealExtreme: $35.05 Mystery JG-001 20mW Green Laser Sight with Gun Mount (1*CR123A Included)

    Both types are affected by the cold. Not the price point extremes called for, but a bit different.

    I would imagine that the modules are manufactured to a range of standards.
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  4. #44
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    I would be 99% sure the driver, diode, lenses, and filters are not affected by normal range temperature (say up to -20F), but the battery would. Pierre has a 123A battery, which is a rechargeable Li-Ion one, LESS sensitive to cold, but still affected by it. Factoring in the fact that rechargeable batteries self-discharge a bit more than regular zinc-carbon batteries, I can understand how Pierre sees a SMALL difference between the cheap laser and his better one.

    But still...anything about the Jasper ? I'm really curious to hear from an owner or someone who tested it.
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  5. #45
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    There seems to be a very large number of Jaspers used by the gang on Cloudy Nights. One of the features that they seem to continually tout is that it does not die in cold weather as have others they have used. ferk, the point you make about batteries might be the crux of it for the difference. From what I can see, most units use a couple of AAA batteries and the Jasper uses one lithium 3v battery. Perhaps the power source is what allegedly makes it impervious to the cold.
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  6. #46
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    Yeap, looks like. I guess when you get the Jasper you are FORCED to use the Lithium battery. But when you own a laser that fits only AAAs...well, I guess you typically use regular batteries instead of the much more expensive Energizer e2.

    On the rechargeable side: there is an upside to the Jasper. I think there ARE rechargeable CR123s out there, but I don't think there are Li-Ion 1.2V AAA. Bottom line: you can use rechargeables with the Jasper, but probably not with the other barrel sizes.
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  7. #47
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    The proper ring mounting will have a thumb screw on the top that you screw down onto the button on the laser.
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  8. #48
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    Of course hopefully with that lithium battery and the fact that the unit will be used for momentary locking on to a target, the battery should last for quite a long time.

    Joe, I do see that the Orion unit has the screw ring that activates the laser button.
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