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MTO 500 f8
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francis View Drop Down
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Posts: 1341 		Post Options Post Options   Quote francis Quote  Post ReplyReply Direct Link To This Post Topic: MTO 500 f8
    Posted: 20 January 2019 at 20:35
I bought this optic for 10 euros
I ventured to clean it both outside and inside
very simple, two mirrors and the central lens.
today tried the 1 freehand the 2 on a stand this is the result .. someone who has an experience with the mirror f8 (native files)
 



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sybersitizen View Drop Down
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Posts: 14430 		Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2019 at 21:51
Not very good ... but worth the cost as an experiment.
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neilt3 View Drop Down
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Posts: 2905 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2019 at 22:22
I've had this problem with a mirror lens I stripped down once .
When putting the front lens part back in i screwed it in a bit too much giving it a soft image .
Took a bit of trial and error to set it up right again .
I can't remember which lens it was , but maybe that's the issue here .
Most lenses have the front lens element screwed fully in , but not the one I worked on .

Just a thought .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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francis View Drop Down
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Posts: 1341 		Post Options Post Options   Quote francis Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 18:37
thanks to you

sybersitizen
neilt3

it was just a good experience, completely disassembling it, I convinced myself that it is not a good lens.

best regards francis
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neilt3 View Drop Down
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Posts: 2905 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2019 at 00:38
It's capable of better shots than that .
If I were you I would strip it down again , rebuild it , and adjust it correctly .
have a look here ; https://www.pentaxforums.com/userreviews/3m-5a-mc-cccp-500mm-f8.html , it seems quite well regarded .

For a manual focus mirror lens the tamron adaptall 500mm f/8 SP and 350mm f/5.6 SP lenses are very good . The ergonomics work well with them as well , along with the good long lens shade that helps increase the contrast .

I've just bought my second Minolta 500mm F/8 AF Reflex as my first had oil deposits on the mirror .
This one is as good as new ( it might even be unused NIB) and looks to be giving very good results .
Need to try it out in decent light for faster shutter speeds and lower ISO's to see what it can do .
Any time I'm not working it seems to be dull and raining or night time !
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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woodrim View Drop Down
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Posts: 1922 		Post Options Post Options   Quote woodrim Quote  Post ReplyReply Direct Link To This Post Posted: 28 March 2019 at 14:07
The Russian mirrors are pretty good with some even better than others. All catadioptric lenses are sensitive to proper collimation, even temperature changes can affect the image until it acclimates. I have read about "relaxing" the rear section by making sure it is not too tight. In fact, it should be assembled and snugged just enough not to be loose. I have learned this lesson with my Rubinar 5.6/500 after experiencing astigmatism. It was only my mount that was screwed on too tight. To be safe, I made sure the tripod collar was not tightened much and the lens shade as well. The lens is very sharp now.
Regards,

woodrim
 



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JorStan View Drop Down
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Posts: 1 		Post Options Post Options   Quote JorStan Quote  Post ReplyReply Direct Link To This Post Posted: 24 January 2022 at 19:19
Hi,

Would anyone know where to get a ring collar, or some sort of stabilizer, for the MTO 500 f8 lens? Thanks
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Basil View Drop Down
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Posts: 2659 		Post Options Post Options   Quote Basil Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2022 at 21:42
something like this would work
To see is to enjoy. To see beyond is to rejoice.

A77Mark II; A6600; A99; various film bodies and an ever-changing collection of lenses
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Snegren View Drop Down
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Posts: 5668 		Post Options Post Options   Quote Snegren Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2022 at 08:48
Originally posted by Basil Basil wrote:

something like this would work

It would be nice but I fear it will not. The 500 mm mirrors have a large diameter and are not tapered like normal telephoto lenses. The illustration does not provide any info on the maximum diameter that can be handled.
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.” Søren Kierkegaard
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