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DIY: "fixing" a Zenitar M 16 to use with a 5/7D/alpha

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polossatik View Drop Down
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Post Options Post Options   Quote polossatik Quote  Post ReplyReply Direct Link To This Post Topic: DIY: "fixing" a Zenitar M 16 to use with a 5/7D/alpha
    Posted: 04 September 2006 at 16:40
the zenitar "fisheye"


Rather sharp lens that costs (with adaptor) around 110 - 140 euro on ebay... I got my copy from a seller named "kapacan" who send it from France (130 euro shipping included)

A minireview of the Zenitar can be found here

But there may be some other issues (like i found out :) ):

Infinity
--------

If you have problems with going to infinity then check first if the focus ring to be able to go whole the way to infinity.

The original info is here but basicly, peel the rubber focus ring out of the way, loosen 3 screws in the wholes underneath the rubber ring, turn the metal focus ring whole the way to the infinity symbol -> the infintiy symbol should be nicely centerd on the red marker line, tighten the screws again and put the rubber ring back on.

Edit: please be carefull and use a exact matching screwdriver.
there is at least one person who had the "head" of the screw broken off.



If that is not enough to be able to focus to infinity, start sanding the included M42 adaptor to 1 mm or get a new one that works...

A full overview is in this post

My adaptor that was included before:



and after sanding :





Edited by polossatik - 29 June 2007 at 14:19
7D / A580 and assorted lenses from 8mm fish to 1000mm / Minolta 7s Rangefinder /

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polossatik View Drop Down
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Post Options Post Options   Quote polossatik Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2006 at 16:53
Aperture
--------

After you finally can get to infinity you'll notice that you're unable to step down the lens...
The lens is wide open no matter wich F value you choose.
The problem is that the pin at the bottom is not pressed in, and that keeps the lens wide open



if you push it down it will lower a lever and you can see the diafragma closing if you set it to 22 and look in the lens.



the solution: You can simple remove the pin...

How? Remove the clear filter, put the aperture ring on the lens to 22 and unscrew the 3 screws at the bottom



this will take off the M42 mount and you can then see the lever:



simply unscrew the 2 screw (watch out for the spring) and remove the pin and other stuff...



a look in the inners of the lens :), as you can see the diafragma is still functional...



now simply screw the M42 mount agian in place and put the clear filter back on...
now you can change the aperture ...



I hope this helps someone!

Edited by polossatik - 06 September 2006 at 14:34
7D / A580 and assorted lenses from 8mm fish to 1000mm / Minolta 7s Rangefinder /

HP Photosmart Pro B9180 In Da House!!
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Sanjuro View Drop Down
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Post Options Post Options   Quote Sanjuro Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2006 at 17:18
That is great info, I want to buy this lens too, I am looking for a fisheye and this is the cheapest alternative for me.

Thanks a lot!
Rgds
Sanjuro

"I paint objects as I think them, not as I see them." --Pablo Picasso
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polossatik View Drop Down
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Post Options Post Options   Quote polossatik Quote  Post ReplyReply Direct Link To This Post Posted: 05 September 2006 at 01:17
Some pictures i took ...
Seen i was hitting 4000 (before the fix for the aperture so all pics are at 2.8 !!! ) the last 2 are a tiny bit overexposed :)
I'm not 100% if stepping down will sharpen or if i need to sand some more... i stopped sanding because i was fed up with it :)

As you can see on the indoor picture this lens has a good tendency to produce purple articfacts around overexposed / harsh light area's..

But i just post them unalterd to give you an idea for the moment... i'll post some other ones later after playing with the aperture :)

ceiling of the Basiliek of Koekelberg in Brussels/Belgium


view towards brussels centrum from the front of the Basiliek:



around the basiliek...



full size images
http://img367.imageshack.us/img367/9757/basiliekinsidefo6.jpg
http://img367.imageshack.us/img367/2526/buitenfk8.jpg
http://img367.imageshack.us/img367/8121/buiten2nx6.jpg

greetz

Edited by polossatik - 05 September 2006 at 01:59
7D / A580 and assorted lenses from 8mm fish to 1000mm / Minolta 7s Rangefinder /

HP Photosmart Pro B9180 In Da House!!
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ematsuda View Drop Down
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Post Options Post Options   Quote ematsuda Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2007 at 03:38
polossatik, darn glad I saw this post as I couldn't get mine to stop down. I did the above method of pulling the pin and it works now. PHew! Thank you.
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polossatik View Drop Down
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Post Options Post Options   Quote polossatik Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2007 at 09:35
Glad it helped.

Feel free to add some links to pictures taken with the zenitar in this post.
7D / A580 and assorted lenses from 8mm fish to 1000mm / Minolta 7s Rangefinder /

HP Photosmart Pro B9180 In Da House!!
 



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Turerkan View Drop Down
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Post Options Post Options   Quote Turerkan Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2007 at 11:53
my zenitar will arrive in 2 weeks:):)

people who doesnt know much about this lens shouldnt be scared off. Because currently this lens is also available in minolta A mount. It's still manual focus and manual aperture, though..
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Post Options Post Options   Quote kiklop Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2007 at 13:06
Great contribution ... thanks !
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Post Options Post Options   Quote Maffe Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2007 at 13:12
Thanks for sharing this, shure will help alot of Dyxumers!
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Post Options Post Options   Quote vertigo Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2007 at 00:52
Hi everyone,

I just got my Zenitar 2.8/16 fisheye off ebay (ordered from a place in Canada but the package arrived from Belarus!:P)

After fiddling around and attaching the Minolta AF adaptor, I got the lens not detected sign; I turned off shutterlock in menu 2 and it seems to be working ok as a manual only lens and I can't seem to adjust aperture.

I'm going to unscrew the top and remove the pin as suggested in this thread, but I have a couple of questions.

My Sony A100 in camera meter doesn't seem to pick up the aperture and I can't adjust the aperture using the AElock/shutterspeed method I use for all the other lenses.

I hope I got my questions across ok.

Can someone out there point me in the right direction?

Thanks!! :)
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2007 at 01:02
When you use a manual stop-down lens on your AF body, you need to put the camera into 'A' mode to let the camera set the appropriate shutter speed (as it cannot contol the aperture) - you manually stop down the lens; so the larger the f-number - the darker the screen. The exif data will show the f-stop as being f1.0 - purely because the camera does not know the proper f-number, so it takes f1.0 as a default. Metering should be reasonably accurate, but some people report that some lenses need extra exposure compensation - a bit of testing will tell you if you need to worry about this.

Bob
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Post Options Post Options   Quote vertigo Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2007 at 03:06
Thanks, Bob! I'll give it a shot and report back if I have problems.

Cheers!
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Post Options Post Options   Quote gonzalez52 Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2007 at 21:38
Hi all! I am still trying to adjust me Zenitar and I really need your advice. I got my hands on 2 different adapters and I am trying to get the best results out of the zenitar i.e. make it focus on infinity. What I would like to ask is 1) what will happen if you bring the lens too close by adjusting the metal focus ring? and 2) what is a safe "infinity" distance? 10-15m should be consider infinity or not?

The reason that I am asking is that I think I turned the metal focus ring too much. A try to focus to a building 15m away and it is in focus when the red marker is centered at 0.8. Before and after that point it becomes out-of-focus.I can understand that it gets out of focus at closer distance marks(0.6, 0.4 etc) but over infinity-if we suppose that 0.8 is infinity-(1.2 and infinity) it shouldn't be out-of-focus, right?

Chris
-----
Former owner of KM D5D
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Post Options Post Options   Quote cjc181166 Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2007 at 00:27
Here is the thread from last year that talked about fixing a Zenitar to work on your camera. Have a read: Zenitar 16mm
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