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#1
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fast telephoto lens
Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras
out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? |
#2
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Sure, if you have a 400mm f2.8 telescope and expect it to work only
manually. I suspect it will be a lot more convenient, better results (optimized for a flat plan focus) and maybe even cheaper by buying a real lens. -- Joseph Meehan 26 + 6 = 1 It's Irish Math ".::SuperBLUE::." wrote in message ... Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? |
#3
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Hi,
Telescopes as Swarovski-Habicht and Kowa do have a telescope adapter but it is at F8 or F11 : an 800mm adapter at f8 and a 1100mm adapter at f11. Cheers, Luc ".::SuperBLUE::." schreef in bericht ... Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? |
#4
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Hi,
Telescopes as Swarovski-Habicht and Kowa do have a telescope adapter but it is at F8 or F11 : an 800mm adapter at f8 and a 1100mm adapter at f11. Cheers, Luc ".::SuperBLUE::." schreef in bericht ... Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? |
#5
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..::SuperBLUE::. wrote:
Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? You will have a hard time getting f/2.8 from a telescope. Telescopes with that fast of an aperture are special designs that often have curved film planes, like Schmidt telescopes, or would be quite expensive. But you could get f/4.5 to f/6 effectively. I've tested a 6-inch aperture f/6 homemade Newtonian, and it delivers very sharp images, in fact sharper than top end telephotos. That equates to a 914mm f/6 telephoto, that cost only a few hundred $ to build. The problem is focusing. If you intend to do astrophotos, there are focusing aids (do a google search for DSLR focus), but if you want to do wildlife photography, where focus is constantly changing, it would not be a good solution. Focus is very difficult with DSLRs unless you can change the focusing screen and can install a better microprism. I settled for a 500 mm f/4 L IS telephoto. Roger Photos at: http://www.clarkvision.com |
#6
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..::SuperBLUE::. wrote:
Is it possible to make a system similar to the 400mm f/2.8 for dslr cameras out of a telescope and a adapter? Which telescope? 150mm/ 6inch one? Which adapter? You will have a hard time getting f/2.8 from a telescope. Telescopes with that fast of an aperture are special designs that often have curved film planes, like Schmidt telescopes, or would be quite expensive. But you could get f/4.5 to f/6 effectively. I've tested a 6-inch aperture f/6 homemade Newtonian, and it delivers very sharp images, in fact sharper than top end telephotos. That equates to a 914mm f/6 telephoto, that cost only a few hundred $ to build. The problem is focusing. If you intend to do astrophotos, there are focusing aids (do a google search for DSLR focus), but if you want to do wildlife photography, where focus is constantly changing, it would not be a good solution. Focus is very difficult with DSLRs unless you can change the focusing screen and can install a better microprism. I settled for a 500 mm f/4 L IS telephoto. Roger Photos at: http://www.clarkvision.com |
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