Please note : Many of the small pictures in this web site can be clicked on to take you to larger, easier to view versions. If you place your mouse pointer on a picture and the pointer changes into a hand shape then that picture links to a larger version.

Do you need to know the magnification of a given lens when used with your telescope? Don't know the focal ratio for your 'scope?  To find out what they are, simply click here and try out my handy lens calculator.  (Requires Microsoft Excel to be installed your computer)

E-Mail   david@dmottershead.co.uk