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04-08-2008, 02:05 PM   #1
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Share What I Found

Those of you looking for a mirror lens, I found this...

PS..I returned the Mirror lens I bought and found a mint Tamron 500mm f8.0 lens for 180 euros and an adaptall for the Pentax for 40 euros. Cost me 220 euros total.

Ben

VIVITAR TELE-MIRROR LENS SERIES 1,500MM./F8,CASE,CAPS++ - eBay (item 170209042850 end time Apr-18-08 10:47:48 PDT)

04-08-2008, 02:23 PM   #2
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What kind of mirror lens did you return?

I wish the prices of Rubinars hadn't spiked up so much - they seem to be the only currently manufactured mirrors with a decent reputation.
04-08-2008, 02:55 PM   #3
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Not a big fan of mirror lenses, but you did get it at a good price, so one cannot complain about anything.

Is the Tamron a mirror lens as well?
04-08-2008, 05:21 PM   #4
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Ben you should see if Pentax has one of these Reflex lenses laying around they can lend you. The major thing with this Pentax lens is how compact it is for the focal length.

04-08-2008, 05:32 PM   #5
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Okay... I have to ask.... What's a Mirror Lens?

D.
04-08-2008, 07:36 PM   #6
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The oversimplified description: a mirror lens creates focal length by bouncing the image through a series of optical mirrors rather than directing the image straight through the lens to the sensor/film.
So with a standard non-mirror lens, the higher the magnification in millimeters the longer the physical length of the lens. A mirror lens basically takes in the image through the front element and then instead of that image going straight through to the camera, it bounces off an optical mirror in the rear of the lens which directs the image back to a smaller optical mirror in the front of the lens (hence the small round dark spot in the front of mirror lenses--that's the back of the front mirror) which directs/deflects the image back toward the sensor or film. This gives the magnification of a supertele--often 500mm--in a package not much longer than a midrange zoom.
Mirror lenses are a very inexpensive way to get supertele reach. They are small and light and easily packable for travel and such. The trade-off is that mirror lenses have strange bokeh and create round "donut" highlights. Many inexpensive mirrors have disturbing distortion. Mirrors typically have slow max apertures, commonly f11, though some "fast" mirrors may achieve f8 speed. They are seldom used for publishable images or wall art work, but are quite often the "reasonable alternative" for photo buffs who want supertele reach, but don't require the pro grade qualities of a multi-thousand dollar mondo tele.
I'm sure you can find a cutaway of how mirror lenses work by trying an online search.
04-08-2008, 08:57 PM   #7
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When you have lemons, make lemonade ...

Check out this creative use of a catadioptric lens' ( aka 'mirror lens' ) bokeh.

Taken early morning.The ...: Photo by Photographer Ron Chappel - photo.net

Pretty cool.
04-09-2008, 01:49 PM   #8
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Ron wrote a good summary, but gives the impression that all mirror lenses are very slow. Not so! I have a Sigma 400mm that's an f/5.6. Sigma have a longer version that's 600mm f/8.

Mirror lenses are usually criticised for lacking contrast and being soft. Here's my rebuttal (and I didn't even resharpen when I downsized it):



04-10-2008, 12:36 AM   #9
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Rickster, thanks for that link. Ron Chappel has good bokeh sense!!
04-10-2008, 01:44 AM   #10
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Not Sharp?

Hmmmm..Not sharp and not Publishable. When I lived in Milan, I was published in Grazia Magazine with a Mirror lens. I was able to find a near new condition Tamron SP 500 f8.0 lens in a camera shop in Paris the same one used for Grazia Magazine. Here is a sample from a test I did.

https://www.pentaxforums.com/gallery/images/1074/1__IGP0264.jpg

Ben
Attached Images
 
04-10-2008, 02:05 AM   #11
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It would be nice to see some outside shots. Find a pigeon or a beautiful girl in a park.
Attached image seems oversharpened.
04-10-2008, 02:55 AM   #12
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QuoteOriginally posted by skaktuss Quote
It would be nice to see some outside shots. Find a pigeon or a beautiful girl in a park.
Attached image seems oversharpened.
Those JPEG artifacts are a result of my having to compress radically to get the image in under 1 meg for this site. Had to compress 7/12 in PS.

Ben
04-10-2008, 03:02 AM   #13
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QuoteOriginally posted by benjikan Quote
Those JPEG artifacts are a result of my having to compress radically to get the image in under 1 meg for this site. Had to compress 7/12 in PS.

Ben
Well, you did get it down to 4.7% of the maximum size 9/12 would've been fine.
04-10-2008, 03:29 AM   #14
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QuoteOriginally posted by SupremeMoFo Quote
Well, you did get it down to 4.7% of the maximum size 9/12 would've been fine.
I am referring to the link that is in the User Photo Gallery....

https://www.pentaxforums.com/gallery/images/1074/1__IGP0264.jpg
04-10-2008, 10:36 PM   #15
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QuoteOriginally posted by skaktuss Quote
It would be nice to see some outside shots.
The leaves I posted were (ahem) outside. I hove other more exciting shots taken outside, but can't post them until I get home in a few days. Sorry, no women or pigeons.
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