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Old Feb 28, 2005, 8:49 PM   #1
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Hi:

Having the Canon 20D and currently looking for a tele conveter to bring up close for sports shots, i came across this link on an "buy it now" on ebay .

http://cgi.ebay.com/ws/eBayISAPI.dll...4&tc=photo

Can someone explain to me what a "mirror lense" is and would it be good for my sports needs? Thanks, jcarboski
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Old Mar 1, 2005, 5:31 AM   #2
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FYI - http://www.popphoto.com/article.asp?...article_id=687
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Old Mar 1, 2005, 8:14 AM   #3
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Here's another option for you.

Get a refractor telescope and a ring that will let you attach it to your

Canon camera. The example is a 600mm apochromatic (made in china):

http://www.telescope.com/shopping/pr...ProductID=6306


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Old Mar 1, 2005, 5:28 PM   #4
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jcarboski

In brief; Mirror lenses use mirrors instead of glass to focus the light onto the film plain. Sort of like the Hubble, but cheaper and with a cameramount on one end.

Now; I have always coveted one of these because they look fantastic and they are loads cheaper (and I am sure lighter) than their glass based cousins.

However, they have one serious disadvantage; They have a fixed aperture and it's usually f/8.

The small aperture will force the camera to use a longer shutter speed which will have the following effects
  • you will need to be using a tripod if you can't get 1/750 sec or so on the shutter speed.[/*]
  • MAY provide difficulties for your AF system due to less light entering the camera[/*]
  • Longer shutter speeds will cause movement blur (of course, you may often want this effect)
[/*]
The 2x converter will take you to F/11, which will exaggerate the above effects

I have never used one of these lenses, but looking at the constraints that come with them, I suspect that they will not fufill your sports photography needs. On the other hand, 500mm for 150 USD is a lot of millimeters for not much money, I would be shocked if you could find a glass equivalent for the money!

Bomber
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Old Mar 2, 2005, 2:51 PM   #5
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just think. . .with the 2x converter you have a 1000mm f11 lens. . .BUT add on the 1.6x Canon digital factor, and you got yourself a 1600mm f11 lens for 150 bucks!
You are pretty much stuck to your tripod though:G
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Old Mar 2, 2005, 3:09 PM   #6
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If you look around the 500mm cats can sometimes be found in f5.6 versions :-)

Peter.
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Old Mar 2, 2005, 3:57 PM   #7
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Hi:

Thanks to all you people for the help concerning the teleconvertor and 500mm lenses. I'm not sure what to do yet but can someone give me a link to get a 500mm lense for $150?? I search and dont get reasonable prices for some reason. Thanks john
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Old Mar 2, 2005, 4:10 PM   #8
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jcarboski wrote:
Quote:
Hi:

Thanks to all you people for the help concerning the teleconvertor and 500mm lenses. I'm not sure what to do yet but can someone give me a link to get a 500mm lense for $150?? I search and dont get reasonable prices for some reason. Thanks john
B&H has one for $109
http://www.bhphotovideo.com/bnh/cont...=102444&is=USA
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Old Mar 2, 2005, 4:36 PM   #9
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Yes, B&H has them from Vivitar, Sigma and a couple other brands all for $109.00...some, though, say they are not in stock while others are.

TG
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Old Mar 2, 2005, 6:13 PM   #10
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Anyone know where I could find one of the f5.6 500mm reflex lenses? I read something about them in OP, I think. . .but a short search on google didn't turn up a whole lot.
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