[AEAJR (Ed)]

Eyepieces come in 3 diameters, .965, 1.25 and 2 inch

Your scope is most likely using .965" or 1.25" eyepieces.

We need you to measure the diameter of the hole in the focuser where you place the eyepiece. Or measure the outside diamater of the barrel of the eyepiece at the end that goes into the telescope. It should be about 1" or 1.25". Then we will know what kind of eyepieces you can use.

There is no hard and fast rule but a general guide line is that maximum practical magnification is about 2X the aperture in mm. So a 70 mm scope would suggest 140X as a practical max magnification, but there is no law that says you can't try higher.

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Specifications:

Optical Design: Refractor telescope
Aperture: 70 mm (2.76in)
Focal Length: 900 mm
Focal Ratio: 10
Eyepiece 1: 20 mm (0.79 inches)
Magnification 1: 35x
Eyepiece 2: 10 mm (0.39 inches)
Magnification 2: 70xFilters:
Moon Filter included -
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Something seems to be off on the specs. The specification says focal length 900 mm.

A 10 mm eyepiece used with a 900 mm FL scope would yield 90X. But they report it as 70X.
A 20 mm eyepiece used with a 900 mm FL scope would yield 45X. But they report 35X.

That would suggest the FL is 700 mm. The focal ratio of 10 would also suggest 700 mm FL so i think the focal length spec is wrong.



To get this 700 mm focal length scope to 100X you would need a 7 mm eyepiece. A 5 mm eyepiece would take you to 140X. Depending on the quality of the optics, the eyepieces and the mirror in the diagonal that might be as high as you would want to take this scope, although there is nothing that says you can't try higher.

The highest magnification you can really use on any scope will be dependent on the viewing conditions, the atmosphere, and the brightness of the object you are viewing. You might get Venus, Jupiter, Saturn and the moon up to 140X in that scope. Dimmer objects would likely look better at lower magnifications.