tag:blogger.com,1999:blog-2807403883562053852.post8278183033785693418..comments2024-03-27T08:40:31.785-06:00Comments on Clayton Cramer.: Temporary NeighborsClayton Cramerhttp://www.blogger.com/profile/03258083387204776812noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-2807403883562053852.post-36706247734397311112017-04-17T11:42:41.665-06:002017-04-17T11:42:41.665-06:00w: f/8, minimum. I will use higher f-stop in futu...w: f/8, minimum. I will use higher f-stop in future. Don't remember brand and it isn't on it.<br /><br />I have used the 17.5" reflector experimentally for terrestrial photography. Like many short focus reflectors there is a bit of fogging from light sneaking in around the aperture. I have a 5" refractor which I have never used for terrestrial photography, because I put an optical corrector on it that turned an achromat with some color fringing into somewhat close to an apochromat, but it changes the focal point so much I can't get it in the camera body through the diagonal that has the threads for the corrector. I need to build something that holds the corrector in and one that isn't a diagonal.Clayton Cramerhttps://www.blogger.com/profile/03258083387204776812noreply@blogger.comtag:blogger.com,1999:blog-2807403883562053852.post-69443658856498988532017-04-17T11:26:56.106-06:002017-04-17T11:26:56.106-06:00Also, aren't all your telescopes reflecting ra...Also, aren't all your telescopes reflecting rather than refractor? Now refractors can be used like a telephoto lens, but they leave a lot to be desired compared to a real telephoto lens which is why one never sees serious amateur or pro photogs using a scope (besides issues like lack of autofocus, etc) for terrestrial imaging.whttps://www.blogger.com/profile/10067896665279403979noreply@blogger.comtag:blogger.com,1999:blog-2807403883562053852.post-17473569632798219702017-04-17T11:00:42.279-06:002017-04-17T11:00:42.279-06:00I take it this $50 lens is not an ED one as there ...I take it this $50 lens is not an ED one as there is a lot of purple fringing one would not see on a quality glass telephoto, but then an ED one at that focal length could easily cost $5000 for a Canon/Nikon/Pentax lens (maybe half or so for a Tamron/Sigma ED one).<br /><br />Curious to know what f-stop/aperture you used and if it was the max for the lens. What brand/model lens is it? Lenses and especially non-ED ones usually have the lowest quality wide open.<br /><br />But for $50 not bad... ;-)<br /><br />I too am curious about the telescope question for taking pictures of terrestrial objects. Most celestial scopes stink for such a task. I have a mid 1980's Canon FD 800mm F5.6L lens (for 1970's and 1980's Canon SLR 35mm cameras)--a giant white telephoto lens (something like 12-16lb--forget the exact weight) and the kind seen at superbowls and world series games. I bought it in 1999 for $3,000 (new in '85 those were like $6K I think). It's ideal for terrestrial of course, but for celestial is it marginal except for Lunar where it is so/so. But then 800mm is only like 16x anyways. Another thing is terrestrial generally doesn't require lots of light gathering unlike a celestial scope. <br /><br />I need to get an FD to EOS adaptor and look into possibly have a conversion done to use a universal mount for digital, but I still have a case full of slide film in my fridge for years (sealed of course) I need to use up first.... I really want the current EOS IS 800mm Canon lens, but at $8,000-$10,000 for that beast unless I win the lottery (I never buy tickets though...odds stink)...whttps://www.blogger.com/profile/10067896665279403979noreply@blogger.comtag:blogger.com,1999:blog-2807403883562053852.post-11224653989102192192017-04-16T10:59:05.952-06:002017-04-16T10:59:05.952-06:00Dor photographing birds?Dor photographing birds?Clayton Cramerhttps://www.blogger.com/profile/03258083387204776812noreply@blogger.comtag:blogger.com,1999:blog-2807403883562053852.post-20374115483434141202017-04-16T10:57:46.555-06:002017-04-16T10:57:46.555-06:00Great shots, Clayton!! you guys will have to retu...Great shots, Clayton!! you guys will have to retuen to Alaska in the summer.John Cunninghamhttps://www.blogger.com/profile/07512292512993140028noreply@blogger.comtag:blogger.com,1999:blog-2807403883562053852.post-77276557454861727402017-04-16T06:36:39.332-06:002017-04-16T06:36:39.332-06:00Are you too busy to use your telescope?Are you too busy to use your telescope?augustrrrhttps://www.blogger.com/profile/10143804054858838018noreply@blogger.com