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PeterJB

5 mm for a 6 inch Reflector

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I own an f/5 6 inch reflector with 1.25" 25 mm and 10 mm eyepieces with a 42 degree FOV and a 2x Barlow lens. I'm considering getting a 1.25" 5 mm long eye relief eyepiece with a 45 degree FOV which would give a magnification of x300 with the Barlow in. This would also give a FOV of 0.15 degrees. The specification of my scope says a maximum magnification of 300x. Would this eyepiece work well with the Telescope?

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A 5mm on it's own would be good - 150x is very useful. I'm sure you will have realised by reading other posts on the forum that 300x won't be much use though. It might be a theoretical maximum for a 150mm scope but in practice the seeing conditions we get rarely make more than 250x useful and very often you get the best images at substantially less than that.

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Hi Peter and welcome to SGL, I am afraid you would not achieve 300x, at 150x as John says, very good.

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Hi,

Adding my tuppenceworth, when getting down to such short focal-length / high mag eyepieces, when using the 150P/Eq3-2 combination, I found the biggest problem to seeing was the time it took vibrations to settle down - any slight touch of the focusser or eyepiece led to big shakes in the FOV for several seconds!

I agree with what's been written already - 150 - 200x should perhaps be what your routinely aiming at for max mag for your set-up. I guess that a 7 or 7.5mm with 2x barlow will give you magnification around the 200x mark which might be sensibly achieved.

Clear Skies,

Jim

Edited by JimBobs63

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You should aim for x200 as your optimum magnification.

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magnification isn't everything resolution is, and 150mm should give you some excellent views , i have just come back from wales and the dark skies let me see

m81,m82, m3(fantastic) m38,m37, plus many more and all at low/medium power.

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