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Thread started 15 Jan 2007 (Monday) 02:42
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Some Lens Trivia...

 
Belmondo
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Jan 21, 2007 11:39 |  #31

puddlepirate44 wrote in post #2575692 (external link)
It got tired of always being compared to his older brother, the f/.95. "Why can't you be more like your brother?" Mom would say. Not that the big brother helped things along. Poor f/1.0 was always second place, never first. Always reminded that he was just .05 short. "If you only tried harder..."

I believe the f/1.0 finally gave up trying to compete and went into marketing, or joined a circus, or became a lawyer or something like that.

It developed a red ring, so they sent it to the Mayo Clinic.


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puddlepirate44
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Jan 21, 2007 11:50 |  #32

belmondo wrote in post #2575888 (external link)
It developed a red ring, so they sent it to the Mayo Clinic.

The All-knowing Mod answers....


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Collin85
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Jan 23, 2007 03:32 |  #33

5200mm? Try 17280mm.

It's Canon's discontinued $80,000USD 1200mm mounted on a XL1 (or should I say, mounted the XL1 on the 1200mm), along with the 7.2 multiplier XL1 EOS adaptor and a 2x extender.

-> 1200mm x 7.2 x 2 = 17280..

IMAGE: http://www.dvinfo.net/canon/images/eos1200bb.jpg

Atleast it's alot more portable than that 5200mm ;)

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Jan 23, 2007 03:44 |  #34

Interestingly enough..the 1200mm is back on the Canon USA website yesterday as being a part of the lens lineup...they put up a new lens chart and it shows. I wonder...........???


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Collin85
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Jan 23, 2007 03:51 |  #35

Woolburr wrote in post #2585218 (external link)
Interestingly enough..the 1200mm is back on the Canon USA website yesterday as being a part of the lens lineup...they put up a new lens chart and it shows. I wonder...........???

That's great news. I've been wanting to add a few more of these to my 1200mm collection - one for each room in my house :lol: :lol:


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embdude
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Jan 25, 2007 01:47 |  #36

Collin85 wrote in post #2585192 (external link)
5200mm? Try 17280mm.

It's Canon's discontinued $80,000USD 1200mm mounted on a XL1 (or should I say, mounted the XL1 on the 1200mm), along with the 7.2 multiplier XL1 EOS adaptor and a 2x extender.

naw mount the 5200 to the xl1 and you get 36,920mm


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StewartR
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Jan 25, 2007 04:24 |  #37

Can't you adapt that rig to fit a 350D or 30D? I'm sure someone could work out a cobble.

That way you'd get 5150mm x 7.2 (XL1 adaptor) x 2 (extender) x 1.6 (crop factor) = 118,656mm. The field of view would be about 0.026 degrees, which is approximately 1/20th of the diameter of the moon. I expect you'd get something like this:

IMAGE: http://grin.hq.nasa.gov/IMAGES/SMALL/GPN-2000-001487.jpg

(Actually this was taken with a 70mm lens from lunar orbit by one of the Apollo 10 astronauts. I haven't done the maths exactly but I expect 70mm - on a Hasselblad, probably - from lunar orbit would be broadly comparable to 118,656 mm from earth.)

Trouble is, the lens would only be about f/200, so exposure times would have to be on the long side. I've seen good moon shots here with parameters like 1/500th at f/5.6 with ISO 400. So at f/200 you'd be looking at a 2 second exposure - heck, might as well go for ISO 100 to improve the IQ and expose for 8 seconds. Either way, you're going to need a driven mount so that the camera can track the moon accurately for the duration of the exposure. (The entire moon would pass across the field of view in about 6 seconds!!) Sadly I suspect that engineering a mount that could do the job with a 100kg lens would be non-trivial.

So what else could you use such a lens (118,000mm f/200) for?

Anything suggest it's a bit of a dull day in the office today?

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Collin85
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Jan 25, 2007 06:47 |  #38

embdude wrote in post #2596440 (external link)
naw mount the 5200 to the xl1 and you get 36,920mm

5200mm isn't EF. ;)


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Jan 25, 2007 10:31 |  #39

StewartR wrote in post #2596743 (external link)
CEither way, you're going to need a driven mount so that the camera can track the moon accurately for the duration of the exposure. (The entire moon would pass across the field of view in about 6 seconds!!) Sadly I suspect that engineering a mount that could do the job with a 100kg lens would be non-trivial.

I dunno, there are some people in the motor sports section who have a great ability at panning. Just put it all on a monopod and give it to one of them. :)


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Jan 25, 2007 10:50 |  #40

20droger wrote in post #2575724 (external link)
I'm gonna wait for that 500mm f/2.0L that's coming (in my dreams, that is). Okay, so it's almost a foot in diameter... so what? Think what it'll do for birding in the deep, dark woods!

. . . if you can manage to get it there!


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Jan 25, 2007 11:33 |  #41

Years ago I saw a refractive 300mm lens for cameras. It was much lighter and shorter than what a 300mm prime would have to be. I thought this would be the next thing in lenses. Apparently it didn't catch on. Optics must not have been very good. Anyone else remember this? I don't recall what brand of camera it was made for.


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20droger
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Jan 25, 2007 11:41 |  #42

Jon wrote in post #2598047 (external link)
. . . if you can manage to get it there!

I could mount it on a Hummer, à la a gun mount.




  
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Jon
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Jan 25, 2007 11:54 |  #43

Jeff Solenberg wrote in post #2598267 (external link)
Years ago I saw a refractive 300mm lens for cameras. It was much lighter and shorter than what a 300mm prime would have to be. I thought this would be the next thing in lenses. Apparently it didn't catch on. Optics must not have been very good. Anyone else remember this? I don't recall what brand of camera it was made for.

You mean "reflective", se ealso "Mirror lenses". There've been several (dozen) mirror lenses. Vivitar did offer both 300 mm and 600 mm solid cat mirror lenses in their Series 1 line back in the 70s.


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Jul 14, 2008 12:42 as a reply to  @ Jon's post |  #44

Anyone know if Canon ever made a zoom faster than 2.8? Or if anyone except Olympus ever has? 2.8 seems like some sort of zoom lens barrier...


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Jul 14, 2008 14:38 |  #45

Jon wrote in post #2598382 (external link)
You mean "reflective", se ealso "Mirror lenses". There've been several (dozen) mirror lenses. Vivitar did offer both 300 mm and 600 mm solid cat mirror lenses in their Series 1 line back in the 70s.

Catadioptric lenses, ah those were the days. I had one in Canon FD mount long ago. I kinda liked the doughnut bokeh, though a lot of people hate it.


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