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Exotic lenses.

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Dejan Malikovski said:
The telescopes are using mirrors.
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Well, not always. Sometimes they use refractive lens elements like normal camera lenses; sometimes they use a combination of mirror elements and refractive lens elements. Also some really long camera lenses are built around mirror lens elements, such as the Reflex-Nikkor 500 mm, 1000 mm and 2000 mm.

A compound lens (objective) can be made from both refractive simple lens elements and reflective (mirror) elements.

There are also other elements in use in some cases, like Fresnel lenses and prisms. In addition various types of coatings are important to control reflexes but also to tune the colour reproduction of a compound lens and to make the outer surfaces hard and durable.

The word "telescope" comes from the Greek tele = 'far' and skopein = 'to look or see'; teleskopos = 'far-seeing'.

Of course this is just scratching the surface of lens designs.
 
arachnophilia said:
arachnophilia said:
There isn't a single discussion that mentions f/0.7 that doesn't
mention NASA and Kubrik. And this happens everywhere... over and over
and over and over and overrrrrrrrrrrrrr again! :(
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because there's two things it's known really well for: going to the
moon, and filming barry lyndon by candlelight. why should we not
mention the famous history?
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Here:
http://www.google.com/search?hl=en&q=+kubrick+%22f%2F0.7%22&btnG=Search

It's like saying humans came from apes whenever monkeys are mentioned.

GTW
--
http://www.flickr.com/genotypewriter
 
Mark Boreham said:
Nick Wong said:
FYI, Nikon Canada Mississauga office has this lens sitting behind the
service department counter. It always catches my eyes.
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Thats really cool, i'd love this lens. One sold at Christies in 2007
for £6,600.
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If you don't mind this sort of size, I'm sure the newer cat telescopes produce much better IQ for not much more? Also I've heard amazing things about the resolution of fluorite refractors. The closest thing in the 35mm camp is probably the dual fluorite 800 f/5.6 IS canon... see below:

http://forums.dpreview.com/forums/read.asp?forum=1029&message=31243115

GTW
--
http://www.flickr.com/genotypewriter
 
But the comments and the original post was intended to kick start a thread about exotic lenses, and in any case people join the forum all the time who would not know that information. I did know, for example, but I had never seen the lens - so for me the entire post was worthwhile. People ought to take into account everyone else on the forum before dropping negative posts which just bring the forum down somewhat.
 
arachnophilia said:
arachnophilia said:
I have the 120 medical, burned out the flash tube, Nikon didn't have
any replacements, sent it back unfixable. It worked fine on a Fuji S1
and S2 but doesn't meter right on a D200 so I can't use it on my
current cameras. I also think my Tamron 90 f2.5 and my 105 AFD are
sharper. So it sits in a closet.
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i'd say you could send it to me, but... i kinda really want with a
working flash tube.

why doesn't it meter right with the d200? i've heard that all
metering is taken care of by the flash/gn system, or if it's not on,
it works via stop-down metering? that webpage i linked is really the
only info i could find on the lens in any detail. what's it like
using it?
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The aperture works with the focusing, as you get closer the aperture closes down, the flash output remains constant closer you are, even with the increase in mag. Without the flash I can't get a good meter setting with either d200 I have. Some how as the lens stops down the camera doesn't react, so it always tells you you are on f4. You can play with the histogram and do alright. Tells me the metering is based on what the camera body sees and since there is no connection between the lens and the camera there is no reaction. The meters on the Fujis are much less sophisticated from the Nikon N80 and just react to the light coming through the lens and are much less dependent on the lens to camera interface.

Tom
 
Be precise. Arachnophilia (the OP's nick) is love of spiders. Arachophilia (your typo) is love of peanuts.

Although i suspect any of these lenses would take a ripping closeup of a peanut.
 
Canon did a 5200mm f/14 Lens
Bob GB said:
genotypewriter said:
There isn't a single discussion that mentions f/0.7 that doesn't
mention NASA and Kubrik. And this happens everywhere... over and over
and over and over and overrrrrrrrrrrrrr again! :(
Click to expand...
If you are bored, please feel free to bring something new and exotic
to the table.
Click to expand...
--
There are no such words as alot, truely or lense.
 
genotypewriter said:
It's like saying humans came from apes whenever monkeys are mentioned.
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don't be silly. humans didn't come from apes: humans ARE apes. cladistics ftw.

but it's probably a little more like mentioning that homo sapiens and pan troglodytes share roughly 98% of their genome anytime anyone mentions any sort of scientific study involving chimpanzees. which is still valid, btw -- a lot of the reasons to study chimps are their similarities to us.
 
Tom Monego said:
The aperture works with the focusing, as you get closer the aperture
closes down, the flash output remains constant closer you are, even
with the increase in mag. Without the flash I can't get a good meter
setting with either d200 I have. Some how as the lens stops down the
camera doesn't react, so it always tells you you are on f4. You can
play with the histogram and do alright. Tells me the metering is
based on what the camera body sees and since there is no connection
between the lens and the camera there is no reaction. The meters on
the Fujis are much less sophisticated from the Nikon N80 and just
react to the light coming through the lens and are much less
dependent on the lens to camera interface.
Click to expand...
well, in my experience, the d200 mostly only cares about what's coming through the lensmount. it can make a properly exposed image with no information being transmitted at all, neither mechanical nor electronic. it does factor in some information, yes, but it doesn't appear to need it. stopping down metering should work just fine, i think.

the pictures i've seen of the medical nikkor make it look like it's not AI, so it's not sending any information whatsoever to the camera. but if it works like an AI lens internally, keeping the aperture open, and stopping down just before the picture is taken, i could see how that might potentially fool a d200. i've heard that some earlier cameras (like the FA) take the meter reading twice, once before the shot is fired, and once right after the lens iris contracts -- that should provide an accurate metering no matter what. i guess the d200 doesn't do this?

very strange... i'm not sure i fully understand. i guess i'd really have to mess around with one and see for myself.
 
filthypuppydog said:
Be precise. Arachnophilia (the OP's nick) is love of spiders.
Arachophilia (your typo) is love of peanuts.
Click to expand...
hey! i didn't know that. learn something new everyday i guess.
 
I just bought one of them exotics ... the Vivitar 135mm f/1.5 Professional lens in Nikon F mount ...

Haven't got it yet, but when I do, I'll post some samples done with D3 and D3x for sure.

--

Robert Capa said 'you can never get close enough'. Well, he did.... He also often visited my daily photoblog at http://logatec.blogspot.com/
 
Mark Boreham said:
How do I attach my D3 and can I use a TC-20E?

Great achievement - the next version (James Webb Space Telescope)
should be spectacular!
Click to expand...
Adaptors of all kinds are available on ebay - there must be one suited for your task...!

The James Webb Space Telescope is more scary, because no repairs are possible after liftoff.

--
  • Jan
 
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