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 Post subject: What is the highest magnification this telescope can take, w
PostPosted: Mon Apr 21, 2014 11:09 pm 
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What is the highest magnification this telescope can take, which mag would be best choice?

I have a four inch newtonian reflector. I live in a sub-urban town. I live in relatively good skies, as most of the constellations are visible and many stars are seen. However I can"t see the milky way clouds. The focal length is 400 so the upper magnification is 240, 60 X 4. But that is the rough upper limit, so the limit of where I am would be about 160 right? Then both a 5mm or 6mm eyepiece are okay for it. Right? (Assuming the eyepieces are good quality)


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 Post subject: What is the highest magnification this telescope can take, w
PostPosted: Sat Aug 05, 2017 7:34 pm 
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The Daws limit on an aperture of 4" or 102mm is 102x2 = 204x


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 Post subject: What is the highest magnification this telescope can take, w
PostPosted: Sun Aug 06, 2017 7:00 am 
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Higher magnification is exactly what you do *not* want for viewing the milky way. If you cannot see the milky way with your naked eyes, then you likely will not see most portions of it with any other optics. You can try using a pair of binoculars, which can reveal some interesting portions of the MW.

Before you give up, though, do one of the following:
(1) create a duck blind - essentially a light shield to block the light from nearby streetlights and house and such. Lay down on the gras, or lay back on a recliner, and give your eyes plenty of time to adjust to the darkness. If youve been indoors or exposed to bright lights within the previou 20 minute, your eye are not well dark-adapted. As you lay back in the darknes, they can get even better - reaching pretty much maximum dark-adaption efficiency around an hour to an hour and a half.

(2) find a dark-sky location that is an easy drive - say, within an hour or so. Be sure to use red-film-covered flashlight or similar to help keep your dark-adaptation. Keep your car light and such off.

The sloppy rule-of-thumb that I use for maximum magnification that i...reasonable.. with most scope i : max. magnification = aperture in millimeter. If your scope aperture i 104 mm, you will probably want to stay under 110X (and youll usually find the best viewing at closer to 40X or so)



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