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Nizo Lightmeter issue


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#1 Matt Kemp

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Posted 21 August 2008 - 08:46 AM

Hi All,

I recently bought a Nizo 561 Macro, and although the camera seems to be in very good condition in terms of the quality of the lens and the smoothness of motor transport, there is a problem with the internal TTL metering whereby the gauge needle 'sticks' at certain points. For example pointing around a room, the needle will move according to light and dark areas, but then sticks at, say, f2.8. If you then point at a window, it seems to dislodge and jumps to f11. Basically it's sticky, possibly through dirt or lack of use throughout the years.
Does anyone know how I might fix this? Also, does anyone know if it's possible that only the needle is sticking, and in fact the aperture adjustment is accurate, or are the two things locked together?

Any help much appreciated.

Matt
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#2 Jean-Louis Seguin

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Posted 21 August 2008 - 03:37 PM

Hi All,

I recently bought a Nizo 561 Macro, and although the camera seems to be in very good condition in terms of the quality of the lens and the smoothness of motor transport, there is a problem with the internal TTL metering whereby the gauge needle 'sticks' at certain points. For example pointing around a room, the needle will move according to light and dark areas, but then sticks at, say, f2.8. If you then point at a window, it seems to dislodge and jumps to f11. Basically it's sticky, possibly through dirt or lack of use throughout the years.
Does anyone know how I might fix this? Also, does anyone know if it's possible that only the needle is sticking, and in fact the aperture adjustment is accurate, or are the two things locked together?

Any help much appreciated.

Matt



Hi Matt,

They are locked together, The needle in the viewfinder is an extension of the aperture blades. If the needle sticks, the apertures are sticking. Sometimes it is repairable, sometimes not. Worse case scenario: you'll need a new meter assembly. Setting the aperture manually should work OK, if you take your light reading with an external meter.

Jean-Louis
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#3 Matt Kemp

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Posted 26 August 2008 - 05:10 AM

Hi Matt,

They are locked together, The needle in the viewfinder is an extension of the aperture blades. If the needle sticks, the apertures are sticking. Sometimes it is repairable, sometimes not. Worse case scenario: you'll need a new meter assembly. Setting the aperture manually should work OK, if you take your light reading with an external meter.

Jean-Louis


Jean-Louis,

Thanks very much for your reply. I wonder if you know how difficult it is to get the lightmeter assembly out of the camera? I have an old Nizo with a working lightmeter I could cannibalise if you think it's something fixable by a non-professional. Also, I read on some stills camera forums that using lighter fuel to clean the aperture blades can be a good way to free up sticky shutters, would you agree with that?

Thanks again,

Matt
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#4 Jean-Louis Seguin

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Posted 26 August 2008 - 01:08 PM

Jean-Louis,

Thanks very much for your reply. I wonder if you know how difficult it is to get the lightmeter assembly out of the camera? I have an old Nizo with a working lightmeter I could cannibalise if you think it's something fixable by a non-professional. Also, I read on some stills camera forums that using lighter fuel to clean the aperture blades can be a good way to free up sticky shutters, would you agree with that?

Thanks again,

Matt



Hi Matt,

Being a professional camera repair technician and not knowing your background at all, I would not recommend that you attempt a repair yourself. Taking apart a camera is not that hard but reassembling it properly and making sure everything works as it should takes some experience.
I would volunteer my services but 1) I am located in Canada and 2) I already have a large backlog of repair work.

The lightmeter assembly in the Nizo and most other super8 cameras is not designed like a still camera diaphragm. The opening is made up of two moving vanes that pivot on jewel bearings.
They move very freely and are not direct contact with each other. Cleaning with solvents is not necessary. It takes very little to impede the free movement of the blades. The meter movement has a permanent magnet. If any loose metallic particles are attracted to it and stick, it will block the free movement. It's pretty delicate.

Cheers,
Jean-Louis
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#5 Matt Kemp

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Posted 26 August 2008 - 01:33 PM

Jean-Louis,

Thanks very much for your reply, very interesting. I've decided to take your advice in not risking dismantling the camera, I guess for now I'll just stick with an external meter and hope it frees itself up over time with more usage.
I think what I'll also do is start buying broken Nizos and investigate taking them apart. I've got four of these cameras now, and it would be nice to have even a basic idea of how difficult it is to work on certain problems myself. Although having said that, I can see myself in the future sometime sending my camera to Canada in pieces for a proper technician to put back together for me..

Thanks again.

Matt
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#6 Jonathan Ragland

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Posted 31 August 2008 - 03:18 AM

I've also come across the same issue with the same camera. It doesn't seem to matter whether it's on auto or manual, it just gets stuck. I recieved the camera with the two iris vanes completely stuck, almost looked tangled. I went in and carefully pmoved them apart and lightly pushed them on their paths and that worked to at least get them to work sometimes. I am definitely interested in any info, even if it's not 100% safe and guaranteed, etc. I would like to at least try to have it work right consistenly. Keep this thread alive!
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#7 Matt Kemp

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Posted 31 August 2008 - 09:31 AM

I'm still on the search for solutions to this problem, I'll post anything I find. I might even get brave and dismantle the camera, to be honest I can't really use it as it is anyway..
Cheers
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#8 Raul C Palma

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Posted 31 August 2008 - 10:18 AM

Hello,

I just notice that I posted almost the same question yesterday, sorry for that. My problem is with a Nizo 801 Macro. Reading this, a day late :huh: , it seems that a few people have a similar problem. Anyone knows if this is a common problem with Nizos? My Nizo runs and sounds fine except for the light meter in the auto position and manual is not working.

Also anyone knows of a good technician in the US for Nizo cameras. The guy that I use to fix my cameras is not to fond of Nizos.

Thank for all the help.
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#9 Kirk Billingsley

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Posted 29 June 2017 - 11:51 AM

Jean-Louis,

Thanks very much for your reply. I wonder if you know how difficult it is to get the lightmeter assembly out of the camera? I have an old Nizo with a working lightmeter I could cannibalise if you think it's something fixable by a non-professional. Also, I read on some stills camera forums that using lighter fuel to clean the aperture blades can be a good way to free up sticky shutters, would you agree with that?

Thanks again,

Matt

I just repaired one by transplanting from a dead Nizo. It is a very meticulous task. I suggest using watch repair glasses with a diopter. Once I opened it up I found the issue, a very small piece of debris was wedged into the tiny window. I blew it out and cleaned the area with a dental tool. Just so happy that Nizo stayed away from using faux leather skins as Canon does. Very easy to open them up.


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#10 Brendan Schmidt

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Posted 29 June 2017 - 01:32 PM

must be a nizo thing, the light meter doesnt work on my 6080, and setting it manually makes a horrible squeaking sound.


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