Quote:
Originally Posted by jjajadam
i have 2 eye pieces a 25mm and a 10mm, would a 15mm be a good addition also what exactly is a barlow lense? ive looked everywhere but i cant find a red light torch :/
thank you so much for the replies im really happy to be apart of this site 
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A barlow is used to change the focal legth of an eyepiece. So a 2x barlow chages a 25mm eyepiece into a 12.5mm. The effect of this is it increases the power or magnification.
Personally, I am not a great fan of barlows, I find using eyepieces at their native power much better, and the barlow I have is a good quality one. But other use them successfully.
You will soon find that the 25mm is your most used eyepiece. Even a 10mm is too much power given the quality of the ones that usually come with a scope. High end EPs definitely give better images but the difference is most noticeable at the high power end.
If you think you would like a bit more power, a decent 15mm EP will help.
Malcolm