Telephoto Mirror Lens
Nikon D40: Looking to get a Nikon 500mm Len's?
Out of these 3 , 500 mm lens ... which one would be the best option
http://www.amazon.com/Samyang-Telephoto-Manual-Mirror-Mount/dp/B0002Y2PG6/ref=sr_1_1?ie=UTF8&qid=1259214116&sr=1-1-fkmr0
http://www.amazon.com/500mm-F8-0-Preset-Telephoto-cameras/dp/B000M2AHNG/ref=sr_1_2?ie=UTF8&qid=1259214116&sr=1-2-fkmr0
http://www.amazon.com/Vivitar-Multi-Coated-Teleconverter-Digital-Cameras/dp/B0021GL6KY/ref=sr_1_3?ie=UTF8&qid=1259214116&sr=1-3-fkmr0
please help me !!!!!
Thanx !!!!! 
First thing first, skip the 2nd one, it's no good.
Now, 1st and 3rd option. Truth is, the Vivitar mirror lens are just rebadged Samyang. It's actually the same lens (made by Samyang) but with different brand stickers on it. Samyang is a Korean company.
The only difference I can see there is that the Vivitar came with a 2x teleconverter that makes your lens into a 1000mm f/16 lens.
Are they good? Not really, but just to have some fun it's quite okay.
Do remember they will not meter on the D40 (if you're using that). It will not auto focus, and you will not be able to use any of the mode settings other than the "M" mode on your camera. Even then your camera will not tell you if the picture is too bright or too dark. You need to take a picture, check if it's okay, adjust some settings, and take another picture.
If that's fine with you, go ahead and get one.
 Opteka 500mm f/8 High Definition Telephoto Mirror Lens for Canon EOS 1D, 5D, 7D, 10D, 20D, 30D, 40D, 50D, 60D, Rebel XT, XTi, XS, XSi, T1i, T2i, T3 and T3i Digital SLR Cameras List Price: Sale Price: $95.00 You save: $104.99 (52%)  Eligible for free shipping!Availability: Usually ships in 24 hours  |
 Opteka 800mm f/8 Telephoto Mirror Lens for Canon EOS Digital SLR Cameras List Price: Sale Price: $199.95 You save: $230.05 (54%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Opteka 500mm / 1000mm f/6.3 Telephoto Mirror Lens for Canon EOS 1D, 5D, 7D, 10D, 20D, 30D, 40D, 50D, 60D, Rebel XT, XTi, XS, XSi, T1i, T2i, T3 and T3i Digital SLR Cameras List Price: Sale Price: $159.95 You save: $90.04 (36%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Opteka 500mm f/6.3 Telephoto Mirror Lens for Pentax K-2, K-M, K-5, K-R, K-X, K-7, K-2000, K20D, K100D, K110D, K10D and 645D Digital SLR Cameras List Price: Sale Price: $139.95 You save: $110.04 (44%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Rokinon 500mm f/8 Telephoto Mirror Lens with 2x Teleconverter (=1000mm) for Panasonic / Olympus E-5, E-30, E-3, Evolt E-420, E-450, E-520, E-620 Digital SLR Cameras Sale Price: $134.95 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Rokinon 500/1000mm F6.3 Mirror Lens for Canon EOS Mount List Price: Sale Price: $169.95 You save: $230.00 (58%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
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Opteka 500mm / 1000mm f/6.3 Telephoto Mirror Lens for Nikon D800, D3, D3S, D3X, D40, D40x, D50, D60, D70, D80, D90, D100, D200, D300, D300S, D700, D3000, D3100, D5000, & D7000 Digital SLR Cameras List Price: Sale Price: $159.95 You save: $90.04 (36%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
Opteka 800mm f/8 Telephoto Mirror Lens for Nikon Digital SLR Cameras
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