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MTO 500 f8

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francis View Drop Down
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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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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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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 .
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francis View Drop Down
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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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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/
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woodrim View Drop Down
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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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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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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
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Snegren View Drop Down
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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.
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