Ebay and other places are full of older manual lenses which are often every bit as good optically (and sometimes better) as their modern counterparts at a fraction of the cost. It is possible to mount these...
This gives you advice on how to try to save the day when you have bought a telescope that does not come up to your expectations AND also helps you assess the eyepieces in the listing before you buy. Please...
A lot of digital camera users are buying older M42 Pentax screw mounting lenses to use on their cameras. There are a lot of adapters offerd for sale on eBay. Not all are good. The best one to get is the...