Eyepiece recommendation

Hi folks

I have an astromaster 90EQ telescope. I use the 20mm and 10mm eyepieces that came with the scope which seem fine. Should I add more eyepieces or better quality ones and if so what would ye recommend? My main use for the scope is lunar and planetary observations.

Thanks.

Howdy!

The theoretical max magnigication for your scope is 213x (Celestron) and since your scope has a focal length of 1000mm that would give you with your 10mm a magnification of 100x so you could go a bit further (assuming the sky is perfect!) to about a 5mm eyepiece giving you a mag of 200x. (Think thats right..)

I would recommend getting a barlow lens which attaches to your eyepiece and basicaly doubles the strength of your eyepiece, so with the barlow and your 10mm eyepiece you could get the effect of a 5mm eyepiece.

A decent barlow does cost about the price of an eyepiece BUT since your not going mad on magnification and enjoy staying in the solar system you might get away with a much cheaper barlow!

Even better stick an add on the wanted section and see if anyone has one for sale if thats the way you want to go!

Am sure some of the other lads and lassies will give a reply as to their recommendations!



Graham.

Orthoscopic eyepieces are excellent for the moon and solar system, personally I don't like them because of the short eye relief, seeing as I wear glasses.

There are many manufacturers such as Telescope Service, William Optics, etc., that are offering planetary eyepieces, I've not used them, perhaps there are some here who have and can give you an insight into their performance.

The barlow option is a good cheap way to go, it instantly doubles your eyepiece collection, though in your case it will add only one, a 5mm.

Try get with other members in your area and see if they will let you try out some of their collection, there's no harm in asking.

Paul

Thanks for the advice guys.
I'm thinking of getting an Omni 2x Barlow.
AI are selling it for €59. Going to see if I can get it cheaper elsewhere.

ebay is great for stuff like that!

(I wouldnt use a Tasco piece to throw at a noisey cat but thats just my opinion!)

am sure you could find something for less than half that price!

AI are 110% when it comes to help and service and the magazine is great but the prices are unbelieviably expensive!

But if your near and can pick it up at least you would have it straight away...