Hi! if you are Canon manual camera users, your certainly heard of Canon FD lens. The Canon FD lens is one of the greatest collection of camera lens in the world , many modern auto focus lens from Canon is base on the design of Canon FD lens.That's why to learn how to chose FD lens on eBay , you can enjoy a great optic quality but in a much  cheaper and fair price than those lens now Canon currently offering. Type of Canon FD lens The Canon manual focus lens (FD lens)  divided into 2 types, Those produce before 1980, were in metal body and have  a silver ring, But the size and weight will be much more huge and heavy compare to newer version. Here is the link on eBay who are selling the Old version Canon FD lens:?http://cgi.ebay.com/LENS-CANON-FD-50mm-1-1-8-LOOK-LIKE-NEW_W0QQitemZ7589680992QQcategoryZ48552QQrdZ1QQcmdZViewItem Old version FD lens doesn't mean the lens is old , sometimes people trend to chose the coating of these  lens, because nearly all coating of old version FD lens is S.S.C (Super Spectra Coating). It provide more natural and warm color reproduction. NEW FD mount?Another type of Canon FD lens is called  NEW FD mount , although it is introduced in 1976 , but a lot of these lens using were produced after 1980, compare to  old FD lens , New FD mount is much more smaller in size , using more plastic to make the lens body and with a lock at the end of the lens, but Lucky , the New FD mount lens quality is better than those old FD mount. Here is the link on eBay which Selling the New FD mount lens:?http://cgi.ebay.com/Canon-FD-200mm-f-2-8-Telephoto-Lens_W0QQitemZ7589779744QQcategoryZ48552QQrdZ1QQcmdZViewItem FD Lens range?FD lens range from 7.5mm Full circle fisheye to 800mm F5.6 super tele lens, usually , you can find FD 28mm F2.8 , FD 50mm F1.8 and FD 35mm F2.8 less than 50 USD on eBay , because these type of FD lens is great in no. of  supply. How to classify a best FD lens??Just like Nikon System, Canon FD lens ually have different version , apart from old FD mount and new FD mount , user can also find a same focal lane with different aperture, for example , Canon had produced 50mm F2, F1.8, F1.4, F1.2 and F1.2L. F1.2L means the lens is in luxury version , usually it had a red circle on the top of the lens , here is a example :   http://cgi.ebay.com/CANON-FD-80-200mm-f4-L-LENS-AE-1-T70-A-1-T90-WARR-USED_W0QQitemZ7591263478QQcategoryZ48552QQrdZ1QQcmdZViewItem   L lens means the best quality Canon offered, if you owned a L series FD lens, I suggests you to sell it in a high price on eBay. Some of the L lens are very popular on eBay , for example the FD 85mm F1.2L and FD 24mm F1.2L, they are the guarantee of price , usually sell in more than 500USD depends on conditions.   How to buy a lens on eBay if you really like a FD lens listed on eBay, some of the questions you need to ask the seller : is the lens grass in good quality ??Is the lens being repair before ??and finally , please ask him to rate the lens. Lucky to say , FD lens is usually best in design, usually the lens don't need to oil for a long time and reliable, if you are lucky enough . Apart from L lens , Super wide angle, special design lens , like the 35mm TS and super tele lens still in a great demand on eBay. Please wait and compare the price of different seller on eBay , you have a lot of choice , get the right price and you will save more. Besides , chose seller is also important, because buying a camera lens need a lot of trust , so please ask seller more questions and to his rating before bid. Usually a good seller will answer buyer questions, and provide more photos to him/her. The Rare FD  items : Canon FD-EOS Converter?One of the best FD lens assessories is the Canon FD-EOS Converter, it provide a bridge for Canon FD lens to use on some of the latest Canon EF mount body include the DSLR , like Canon EOS 1Ds and 20D, but this converter is extremely hard to find , Canon just produce 500 pieces of this converter in the world , so if you see one of them appear on eBay , this converter usually sell  for over 400 USD, but beware , there is also a lot of third party FD-EOS converter will grass inside , this converter only value for 15-20USD. Here is the macro version of Canon FD-EOS Converter: http://cgi.ebay.com/Original-Canon-Lens-Converter-FD-EOS_W0QQitemZ7591637446QQcategoryZ30059QQssPageNameZWDVWQQrdZ1QQcmdZViewItem