The el cheapo 650-1300mm zoom, for those who care
in [Digital Cameras]
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From: Robert Coe on 1 Jan 2010 09:15 On Fri, 1 Jan 2010 11:38:11 -0000, "RustY �" <No.Mail(a)All.Thanks> wrote: : : "Robert Coe" <bob(a)1776.COM> wrote in message : news:0irpj5tekqum68evt6b9hoqi71ekq1mjtq(a)4ax.com... : > On Thu, 31 Dec 2009 10:29:59 -0000, "RustY �" <No.Mail(a)All.Thanks> wrote: : > : > Don't be snarky. Rich has no particular reason to know the difference : > berween aperture and focal length. Neither of them is made of plastic. : > : > Bob : : I think you will find that Steel is the best material to cast focal lengths : out of. I understand from reading this group that plastic breaks too easily : [ and of course expansion plays havoc with focal lengths ] That shows how little you know about it. You can make focal lengths out of rolled steel, but castings are never used. Bob
From: Robert Spanjaard on 1 Jan 2010 12:06 On Fri, 01 Jan 2010 13:24:33 +0000, Bruce wrote: >>> Buy one and enjoy! >> >>How about internal reflections, like with bright lights in the frame? In >>all the images I've seen of the lens, it doesn't seem to have any >>coating at all. > > Anyone who points a very wide aperture telephoto lens (of any brand) > directly at a light source is in need of some very basic tuition. Thanks, Bruce. You just answered _two_ questions. -- Regards, Robert http://www.arumes.com
From: Rich on 1 Jan 2010 20:55 Bob Williams <mytbobnospam(a)cox.net> wrote in news:z5h%m.86$Wl3.39(a)newsfe11.iad: > RichA wrote: >> Just some info. Wow!! Genuine "optic glass" (as opposed to coke >> bottle bottoms?) >> >> http://www.samyang.pl/product,147,category,5,samyang_6501300mm_mc_if_f >> 816 >> >> The example moon shot they show with it is pathetic. No doubt linked >> as much to seeing changes during the inordinantly long exposure >> needed with an f16 focal length as much as the horrible optics. >> >> A better choice would be the 500mm they offer since it has ED glass >> at least: >> >> http://www.samyang.pl/product,80,category,5,samyang_500mm_f8_preset_ed >> _if_mc >> >> >> > Yep! > It seems pretty stupid to me to try to sell the quality of your lens > by displaying a whopping .06 MP image > Even the cheapest P&S could could have produced an image of that > quality What were they thinking? > Bob Williams > Well, producing a good moon shot takes some effort, no matter what lens you use, but I guess they figured any image of the moon would impress potential buyers of that lens.
From: Paul Furman on 1 Jan 2010 21:55 Robert Coe wrote: > RustY � wrote: > : RichA wrote > : > : > long exposure needed > : > with an f16 focal length ............... > : > : What? > > Don't be snarky. Rich has no particular reason to know the difference > berween aperture and focal length. Neither of them is made of plastic. I disassembled a 28-200 old-ish film super-zoom and it has plastic aperture blades. I wouldn't be surprised if that's used in high end lenses too. -- Paul Furman www.edgehill.net www.baynatives.com all google groups messages filtered due to spam
From: Robert Coe on 1 Jan 2010 22:30
On Fri, 01 Jan 2010 18:55:41 -0800, Paul Furman <paul-@-edgehill.net> wrote: : Robert Coe wrote: : > RustY � wrote: : > : RichA wrote : > : : > : > long exposure needed : > : > with an f16 focal length ............... : > : : > : What? : > : > Don't be snarky. Rich has no particular reason to know the difference : > berween aperture and focal length. Neither of them is made of plastic. : : I disassembled a 28-200 old-ish film super-zoom and it has plastic : aperture blades. I wouldn't be surprised if that's used in high end : lenses too. They wouldn't rust, and you might not have to oil them. And oil that isn't there won't drip onto a lens element. Bob |