Yoshizen's Blog

Lens Mount Adapter — AF type ? ? ?


Mount Adapter(1)A09A3043

Majority of the reader here may not know what this is.  This is a close-up

device called camera bellows. (This one came from a Photo-Slide  

Duplicator  “Illumitron” sold in the 80s. — I think. ) It would extend

the focus of the Lens much further, therefore creates close-up pictures.

(On this photo, Nikon 24mm F2 lens was mounted in reverse direction

to give even higher magnification. )

x9 and x5

With full extension of Bellows, 24mm lens can give  x10 image  (Photo Left)

—– with less extension, this image was  x4  (Photo Right)

x9 and x1.5

And those images were the Butterfly’s wing.  (Photo Left / x10 / 24mm F2)

(Photo Right / x1.5 / Micro Nikkor 55mm F3.5) 

Mount Adapter(4)568-001

Not necessary bellows —– to use any non-dedicated lens on the camera body,

we need to use a “Lens Mount Adapter”.    Especially with the Camera, which

Flange-back was thinner than the lens, such as Canon’s EOS was 44mm and

the Pentax’s  Flange-back was 45.5mm => It would give a margin of 1.5mm

to create an adapter. And the Photo above was the world first “Pentax to EOS”

adapter I made myself, soon after Canon introduced their EOS camera.

(Pentax P-K adapter was Epoxy Glued to a EOS T-mount adapter which was

cut to 1.500mm thin exact.) (Photo Left and the Center) 

There are many Pentax (M-42) to EOS adapters in the Net.  (Photo Right)

Mount Adapter(5)569-001

And this is the Nikon Adapter = a genuine Nikon Mount Ring from their K-3

ring was screwed on to a EOS T-mount ring which was cut to 1.250mm thin

—– together with the mount ring, it made a 2.5mm thick Mount Adapter.

I put a thin lever to move Nikon’s F-aperture using a wire from a Paper-clip.  

(Photo Center)     And I also made a special Lens Rear Cap with 

aluminium tub to protect this thin lever. (Photo Right)

Mount Adapter(6)571-001

Untill few years ago, the mount adapter sold in the Net was just a mechanical

adapter though, a type proclaiming to give AF confirmation started to appear.

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On today’s hi-tech camera, the lens and the body need to work close together.  

The body (or it’s CPU) needs to know Which Lens, What Max F-aperture,

Which setting on the Zoom, Where is the current focus setting, etc etc.  

To give those informations, a circuit board with Micro-controller was

connected through the lens mount contact. (Photo Left / from Sony Lens)

 mount Adapter(A)A09A3715The Mount Adapter with Focus

 Confirmation has an electronic contact

and the inside having 1.5x3mm  size

Micro-controller which supposed to

give Lens Informations, such as Manual

Focus setting (hence the camera should 

give focus confirmation only) — but, all

the adapter I bought, non ever worked !  

(On the photo, 5 pins of the chip were

connected to each lens contacts ) 

Mount Adapter(8)570-001

I’ve tested Nikon type,  Contax type,  Pentax type, Olympus etc from many

different suppliers, from £7 to as much as £30 though, no AF confirmation

 but only showed F1.4 was the best.  Others were even worse like photos above !  

I smelled very fishy, I didn’t go any further.  (There is a high risk to damage

the camera  such as —— the report from a user.)

My guess was that, one or two, once or twice it might have worked before

though, Canon up-dated their firmware and blocked them = mass produced

(and fake as well) chip was sold, and the Opportunists are making a money

out of fraud !  (How many people actuary claiming money back ?  😀 )

Mount Adapter(8B)A09A3097So, the question is what to do with

such useless and potentially harmful

mount adapter. = as long as

electronically malfunctioning chip is

there, it can’t be used with camera.

—–> The answer is just remove it !  

Put the mount ring on a cooker’s hot-plate

or with any mean, heat it up to about 200 degree C ( Epoxy glue will be soften)

and use a knife to scrape it off.  Then you can use it manual, perfectly, safely.

(Never use wet towel to hold hot ring = hot steam will burn your finger.  

= Use dry kitchen towel instead.   Be be careful not to get burned ! ! ! ) 

mount Adapter(9)567-001

Some maker is boasting “Precise engineering” though, I found most of

them were 0.3mm or so thinner = If it was too thick, it may trouble to

have an infinity focus though, if it was too thin, rotate the lens more. 😀  

And some User report saying “Expensive type has better fix (more firm

mounting) —– This is purely a myth.  

My Tamron 500mm lens has double adapter mount  (Tamron to Nikon +

Nikon to EOS / Photo Left)  hence it’s hard to call it anything solid !

—– Still it can create solid sharp image.  => Grip the camera body and

the lens, try shake them = you can see the lens wobble (on the gap of

lens mount it moves more than 0.5mm !). (Photo Right)  

Especially a Zoom Lens, they wobble a lots, and when you shake it,

you may even hear the rattling noise —– If it was made too tight,

lens couldn’t give a quick focus.   😀    Its loose construction was

the norm of the lens and not much trouble in the normal use.

(Your wobbling hand is far more trouble than the loose lens ! )

———————————–

PS: A funny story was that, when I tested “Lens Extension Cable” my 5D

might have changed its firmware settings inside and since then one of the

“AF confirm” type Adapter (For Contax / Sold by EMF) started working !

(Now, time to time AF confirm sign light-up, still

all the lens was treated as 50 mm F1.4) 

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5 Responses

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  1. bentehaarstad said, on February 5, 2014 at 22:23

    I might need a handyman for trying something like this. Impressive!

    • yoshizen said, on February 5, 2014 at 23:46

      In the photographic front, there couldn’t be so complicated arrangement = such as how to assemble a combination of the equipment, ie mount adapter or a converter of filter diameter etc. —– and most of things are available in the net. If you need anything, just list-up what you need to do and what you got = I’ll sort it out for you. (free 🙂 )

  2. elenacaravela said, on February 6, 2014 at 13:03

    You amaze me with your technical know how Yoshi!

    • yoshizen said, on February 6, 2014 at 14:25

      Thank you Elena. Simply I’m doing this long time. 🙂

  3. […] I was thinking to make an adapter to use the lens on a bellows like this. […]


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