Jump to content


Photo

KERN Vario-Switar 18-86mm OE H16 RX


  • Please log in to reply
5 replies to this topic

#1 Ashley Summers

Ashley Summers

    New

  • Basic Members
  • Pip
  • 6 posts
  • Student
  • South East England

Posted 03 January 2011 - 11:18 AM

Hello,

I wonder if someone can give me some advice;
I recently purchased a Bolex H16 REX-4 online, with a KERN Vario-Switar 1:2,5 18 to 86mm OE H16 RX lens.
I have read that the lens has an automatic aperture control read through the lens – but I wonder if anyone knows if the aperture can also be set manually on this lens?

Also (and this question really exposes my ignorance) how does one remove this lens from the camera body? I am paranoid about forcing or breaking anything on the camera and specific information has so far been surprisingly hard to come across on the web.

I would really appreciate any advice people could offer me.

Ash
  • 0

#2 Robert Lewis

Robert Lewis
  • Basic Members
  • PipPipPip
  • 180 posts
  • Other
  • United Kingdom

Posted 03 January 2011 - 12:31 PM

Hi Ashley. I sent you a PM on this.
  • 0

#3 Jean-Louis Seguin

Jean-Louis Seguin
  • Basic Members
  • PipPipPipPip
  • 719 posts
  • Other
  • Montreal, Canada

Posted 03 January 2011 - 01:56 PM

Hello,

I wonder if someone can give me some advice;
I recently purchased a Bolex H16 REX-4 online, with a KERN Vario-Switar 1:2,5 18 to 86mm OE H16 RX lens.
I have read that the lens has an automatic aperture control read through the lens – but I wonder if anyone knows if the aperture can also be set manually on this lens?

Also (and this question really exposes my ignorance) how does one remove this lens from the camera body? I am paranoid about forcing or breaking anything on the camera and specific information has so far been surprisingly hard to come across on the web.

I would really appreciate any advice people could offer me.

Ash





Go to: http://www.apecity.com/manuals/
Download the manual for Bolex Vario-Switar 100 POE which is similar to yours
p.4 explains lens removal
p.9 explains changing the aperture.

Cheers,
Jean-Louis
  • 0

#4 Ashley Summers

Ashley Summers

    New

  • Basic Members
  • Pip
  • 6 posts
  • Student
  • South East England

Posted 04 January 2011 - 03:18 PM

That’s great Jean-Louis,

Exactly what I needed, thanks a lot.

After reading that manual I have had a good look at the lens, and I am concerned about something else.
The aperture blades seem to be in an odd configuration; a small square at small apertures becoming more of an irregular diamond shape the more open it gets.

Could you tell me if this is normal for a 16mm lens? Or do you think I have either a broken or a modified aperture in this one?

I shall attach a rough illustration of what it looks like, I'd really appreciate it if you could take a look.

At 2.5 there is a little dark overhang visible at the top when looking through the front of the lens whilst held up to the light, it breaks into the clear circle of the open aperture. I think it might be part of the zoom assembly that only becomes
visible when its wide open but thats a complete guess?

lens aperture shapes 2.jpg

Any thoughts would be great.

Ash
  • 0

#5 Jean-Louis Seguin

Jean-Louis Seguin
  • Basic Members
  • PipPipPipPip
  • 719 posts
  • Other
  • Montreal, Canada

Posted 04 January 2011 - 04:51 PM

Yes, the shape of the aperture is normal for this lens. Pretty good drawings by the way.

The diaphragm mechanism consists of only two moving vanes with a V-shaped cut-out.

Remember, this was a very early design of integrated auto-exposure in a zoom lens.

Later, this design is to be found in practically all super8 cameras.

You're right about the overhang visible at wide open, it is a little peek-in mirror that sends light to the photocell. It doesn't affect the image.

Cheers,
Jean-Louis
  • 0

#6 Ashley Summers

Ashley Summers

    New

  • Basic Members
  • Pip
  • 6 posts
  • Student
  • South East England

Posted 05 January 2011 - 10:10 AM

Fantastic, that’s a relief.

Thank you for all that information, you are an invaluable resource.

No doubt I will have occasion to pester you again in the future.

Ash
  • 0


rebotnix Technologies

Paralinx LLC

The Slider

CineLab

Gamma Ray Digital Inc

Aerial Filmworks

FJS International, LLC

Ritter Battery

CineTape

Technodolly

Wooden Camera

Abel Cine

Broadcast Solutions Inc

Tai Audio

Glidecam

Media Blackout - Custom Cables and AKS

Rig Wheels Passport

Visual Products

Metropolis Post

Opal

Willys Widgets

Opal

FJS International, LLC

Glidecam

Aerial Filmworks

The Slider

Metropolis Post

Paralinx LLC

CineLab

CineTape

Wooden Camera

Technodolly

Visual Products

Broadcast Solutions Inc

Willys Widgets

Abel Cine

Ritter Battery

Rig Wheels Passport

Media Blackout - Custom Cables and AKS

Tai Audio

rebotnix Technologies

Gamma Ray Digital Inc