Is there a way to mount a telescope focuser & eyepiece to the back of a Canon telephoto lens?
I could see my 100-400 becoming a very good short FL wide field refractor.
n1as Goldmember 2,330 posts Likes: 25 Joined Oct 2007 Location: Salem, OR More info | Dec 03, 2008 19:13 | #1 Is there a way to mount a telescope focuser & eyepiece to the back of a Canon telephoto lens? - Keith
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msowsun "approx 8mm"  More info | Dec 03, 2008 20:18 | #2 If there were such an adapter, would it be much different than just using your camera as an "eyepiece"? Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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JackProton Goldmember  2,348 posts Joined Feb 2007 More info | Dec 03, 2008 22:34 | #3 I've seen an m42/Pentax Screwmount-to-eyepiece adapter on the Russian site Rugift.com - they sell new copies of old manual m42 lenses as well as a few heavy mirror lenses. I also recall seeing someone who built a homemade EOS-to-eyepiece adapter by taking a rear lens cap, drilling a hole through it and gluing on an old focuser. If you search a bit, his page might still be out there somewhere.
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tkbslc Cream of the Crop 24,604 posts Likes: 44 Joined Nov 2008 Location: Utah, USA More info | Dec 03, 2008 22:46 | #4 msowsun wrote in post #6808389  If there were such an adapter, would it be much different than just using your camera as an "eyepiece"? agreed, maybe buy an old broken film SLR with a good viewfinder? Taylor
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asysin2leads I'm kissing arse  6,329 posts Likes: 3 Joined Dec 2006 Location: Lebanon, OH More info | Why don't you ask here..... Kevin
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440roadrunner Goldmember 1,312 posts Joined Jul 2007 More info | Dec 03, 2008 23:40 | #6  Permanent banasysin2leads wrote in post #6809358 Why don't you ask here..... https://photography-on-the.net/forum/forumdisplay.php?f=126 Uh, " !!! AHEM !!! " 2-40D's, 30D, Xt, EOS-3, Elan7, ElanII 100-400L, 24-105L, 17-55IS 2.8, Sig 12-24 EX DG 4.5
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JackProton Goldmember 2,348 posts Joined Feb 2007 More info | What, no epoxy!?
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BigBlueDodge Goldmember  3,726 posts Joined May 2005 Location: Lonestar State More info | Dec 04, 2008 21:02 | #8 Very simple to do. See here David (aka BigBlueDodge)
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Cool hardware hack!