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 ATC & Lens
 stoney55 From UK - England, joined Apr 2013, 3 posts, RR: 0Posted Sat Apr 6 2013 15:09:16 UTC (1 year 12 months 3 hours ago) and read 4364 times:

 Hi guys im a big plane enthusiast and want to be able to listen to ATC convos aswell as taking close up pictures of planes. So with the ATC towers what device can i pick up for 50-100 quid which will allow me to do that and will it need to have the 8.33Mhz split feature as i read somewhere it will? as for the lens what sort of lens is good for pics about 100-200 metres from the runway? i use an old sony SLR at current.
 oly720man From United Kingdom, joined May 2004, 6945 posts, RR: 11 Reply 1, posted Mon Apr 8 2013 15:56:36 UTC (1 year 11 months 4 weeks 2 hours ago) and read 4213 times:

 There is a wide selection of radios here, though some are discontinued. http://www.javiation.co.uk/ Comments re: 8.33kHz (not MHz) http://www.javiation.co.uk/833.html As for the lens, what planes? Cessnas or A380s? If your maths is up to scratch you can calculate the viewing angle for an aircraft at a distance. tan (half view angle) = half length of aircraft/distance. e.g. B737-800 at 100m, length is 40m -> tan(half angle) = 20/100 = 0.2. View angle = 22.6deg. http://en.wikipedia.org/wiki/Angle_of_view#Common_lens_angles_of_view From the wiki page this horizontal view angle is for a lens just above 85mm. For an A380 at 100m the angle would be 41deg, so a focal length just less than 50mm. You won't want the aircraft to fill the viewfinder completely so the angle will be a bit bigger and the focal length a bit shorter. You'll have to check what you can get for a Sony SLR to cover from perhaps 40mm to 200mm. This may mean 2 lenses. Sony bought out Minolta so you should be able to get Minolta Maxxum AF lenses for your camera or Sony A mount. There are some 18-200mm lenses for the more recent digital cameras, e.g. Sigma and Tamron but you may need to try them out with a local camera shop to confirm they work with your camera.
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