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deepind

Eyepiece suggestion urgent

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Hi all, 

I have celestron astromaster 130eq scope ..it is very difficult to view through 20mm eyepiece..is there any other for broader view for both terestrial and astronomical viewing?with good eyerelief as I wear glasses..32mm is good ..please reply

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A 32 mm Plossl EP will give you the maximum field of view (FOV) with your scope, which accepts 1.25" EPs only. Alternatively, you could go for a 24mm 68 deg eyepiece, ideally the rather cheap but good MaxVision. Same FOV but more magnification. Both have long eye relief, so should cause problems. For shorter focal lengths, so-called planetary EPs offer decent eye relief (varying from 16 to 20mm).

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If you don't want to spend much money, Celestron's 32mm Omni plossl is a great eyepiece, and terrific value from FLO

IMG_0811.JPG

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29 minutes ago, deepind said:

Can I use for terrestrial viewing?

The image through a newtionian telescope will be inverted, i.e. 180° rotated, so it'll not be suitable for terrestrial viewing.

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52 minutes ago, deepind said:

Hi thanks for reply..is the image quality is good ? Can I use for terrestrial viewing?

@YKSE is correct, a Newtonian reflector is not suitable for terrestrial use. The only reason you can use the supplied 20mm eyepiece is because it has an erecting prism built in to facilitate terrestrial viewing. This is not a usual feature for an eyepiece to have and it would not surprise me if this 20mm is the only such eyepiece available. It would be better to buy a second, more suitable, telescope for terrestrial views in my opinion. The good news is that the erecting prism in the 20mm eyepiece is likely to be a weak link and that any replacement eyepiece you buy should give better astronomical performance.

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I don't find the rotated terrestrial of Newts to be all that bad once you get used to it.  The complete lack of false color with a reflector is amazing compared to cheap spotting scopes is a revelation.

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