How good are zoom telescope eyepieces?
Like a zoom lens on a camera, a telescope zoom eyepiece provides a range of magnifications. This sounds great, but not all zoom lenses are created equal. Some are of poor quality or have such a narrow field of view that I have found them to be undesirable.
Do zoom eyepieces work?
They tend to occupy the middle ground of focal length/magnification, so you may still need a very high and low magnification eyepieces (short and long focal length, respectively), but a zoom could handle everything in between for you. On the face of it, they are a fantastic tool, but nothing is perfect.
Can you use a zoom eyepiece with a Barlow lens?
Basically, any eyepiece can be used with a barlow provided the the combination doesn’t exceed the useful magnification.
Is 10mm or 20mm eyepiece better?
This means that a smaller number on an eyepiece gives a higher magnification. A 10mm eyepiece would provide twice as much magnification as a 20mm eyepiece. It also means that the same eyepiece gives different magnifications on different scopes.
What size telescope eyepieces should I buy?
The largest-focal-length eyepiece you can use with your telescope is easy to calculate: multiply the focal ratio (the focal length of your scope divided by its aperture) by 7. For example, your Newtonian scope is f/5: the largest-focal-length eyepiece you should use is 35 mm.
What is a good zoom for a telescope?
The most beneficial and effective telescope is the one that has magnification 50x more than its aperture in inches. And, when talked in mm then twice its aperture. To get a good 600x you need a 12 inches wide scope.
Can you use a Barlow lens with a zoom lens?
Just unscrew (most barlows do) the bottom lense of the barlow and screw it onto your zoom as you would a filter. Used this way, the combo will give you x one and a half and makes it much easier to view through.