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Archive - October 2007 OpticalXpress a guide to choosing Binoculars, Spotting Scopes & TelescopesPosted 05-Oct-07 13:34:55 BST If you are just starting bird watching you may be confused by all the available options of Binoculars and Telescopes so we will try and guide you through the maze. Binoculars Compacts - Your first decision is "compact" or "normal". A good normal binocular will always beat a good compact so the main reason to choose a compact is on weight and pocket ability. We would recommend only 7x or 8x rather than the 10x's in this size binocular. Prices range from £30 to £300. A good pair would cost around £99. Normal Size - Binoculars are available in two types 'Porro prism' or 'Roof prism' The porro is the more traditional 'dog leg' shape, while the roof prism design gives a shape like two tubes. The Porro's tend to be cheaper but as they are easier to make they can be exceptional value. The roof's normally start well over £100 through the popular £250 to £300 range right up to the very best at £1000. To sum up Porro prism's can be best value, while Roof prism's are neater and can be the best. Do not be persuaded to buy high powers or zooms. The brightness and field of view will be very poor and you can't hand hold them anyway! The best power would be 7x or 8x for general use, up to 10x or just possibly 12x for bird watching if you have a steady hand. A good starting binoculars would be a good quality 8x30 or 8x42. These give bright and easy viewing whilst not being too big, prices £80-£300. Telescopes Price, Size & Weight - In general smaller scopes of 60mm (the size of the front lens) are cheaper than the 80mm. Apart from price, 60mm scopes are smaller and lighter making them ideal if they are going to be carried very far. However a good 80mm will always beat a good 60mm especially in poor light conditions and the larger exit pupil will make them easier to use. Please bear in mind a tripod will have to be used and carried. Money spent on a good tripod is always worthwhile. What Sort Of Magnification Do I Need - For most telescopes 20x to 30x eyepieces are the norm and a wide angle design is an advantage. Zooms of perhaps 20-60x are popular as they allow variable magnification and are now almost as good in quality as fixed magnification. Straight Or Angled - A beginner will find a straight easier to use as you point the scope directly at the subject you are viewing. They are also easier to use in a hide. Angled scopes can be more comfortable to use, lower on the tripod and therefore more stable - and easier to look at birds or objects high up. They are also easier when people of different heights are using the scope. APO & HD Glass - This is an optional feature offered on most high quality telescopes and can double the price. It is worthwhile for the keenest bird watchers or those who must have the best. The special glass can give improved optical performance under some circumstances. Helpful hints on choosing binocularsPosted 01-Oct-07 14:51:28 BST Updated 02-Oct-07 08:29:56 BST OpticalXpress- Tecnical Guide It's worth outlining a few technical terms that will help you make an informed choice of binocular or telescope. IMPORTANT - Safety Information Magnification and Brightness. Field of View (Angle of View) Lens Coatings BaK-4 Prisms Long Eye Relief |