Yoshizen's Blog

Junk Lens — How to recycle ?

Junk Lens(1)A09A9793

After digital revolution,  analogue age old lenses become almost a junk. 

Simply,  the camera  and the lens today are too different from their predecessor.

As the lens has to work with the camera which got so many functions therefore

the lens also needs to function such as auto focus, electronically position controlled

F-aperture, distance-coded focus not mention high zoom ratio, of which the zoom

position was also electronically coded. (Those code were used to control Flash-light)

= In order to deal with all those electronics, the lens having its own microchip and

able to communicate with camera’s main CPU.  

Without having those electronics, lens couldn’t be used on the camera —– except 

Canon EOS   (It can take any lens include a Pinhole in AV-Mode,  of course with

manual mode as well.  — But,  Nikon couldn’t make even a single image out of pinhole,  

without giving quite  complicated procedure to set-up the camera side. )  

Though, don’t misunderstand,  even today,  the optics is still optics, it works on the 

same principal,  hence  if you get a convex lens and concave lens scavenged out of old

camera lens, it would make a telescope for a kids to experiment.  Or use them to project

an image or focus LED light etc etc. 


The lens design has also changed a lot such as the use of aspherical lens  (in fact most

of them are a so-called Compound lens,  aspherically moulded plastic was stacked on

glass lens) —– nevertheless, I admit, today’s lens is very well designed in deed.

(Though, why they became so big and heavy ? — considering, how compact camera

became so small and light, while able to take more or less the same picture.    😀 ) 

In those aspects,  may be there is no point to give a damn to the old lens though, still,

such as  F-aperture diaphragm has changed almost nothing (only driving mechanism

may have changed to motor etc.   And the front lens is still, good achromatic lens.  

Not mention the focusing helicoid which is impossible to make by ourselves,  still

having lots of use, not only in the photography.

= We can scavenge a lots out of such old lens.  —– As a matter of fact, good old 

non-plastic lens is far easier to disassemble and Re-use.   (Plastic built lenses were

NOT designed to be serviced as they were built by snap fit or heat-weld.)  

Junk Lens(2)A09A9787

Junk Lens(3)A09A9838

(Lens above is a Canon TV lens, it must had a price of many thousands of pounds. )

The best thing is,  we can find those old lens in a camera shop’s junk box,

with a price of couple of pounds, if not free. 

 To disassemble those lens, there may not need to have more than small

+ AND – screw drivers.  (but need to use the brain a lot = it is a puzzling game) 

In coming posts, I’ll show you what I’m going to do with those “Components”

saved from old lens.



8 Responses

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  1. drawandshoot said, on July 15, 2013 at 22:20

    Oh, interesting! I look forward to your posts about this, Yoshizen.

    • yoshizen said, on July 15, 2013 at 22:31

      Thank you Karen.
      I’ll show you what I’ve been after many years = kind of soft image soon. 😉

  2. bentehaarstad said, on July 15, 2013 at 22:21

    I don’t think I will try, I am a bit disabled in these kind of operations.. 😉

  3. elenacaravela said, on July 16, 2013 at 13:50


    • yoshizen said, on July 16, 2013 at 15:21

      I wished you reserved this word until after you saw the resulting photos. 😉

  4. […] you may visit the old posts. Here and There. […]

  5. Daffodil — Lens Test | Yoshizen's Blog said, on March 18, 2015 at 12:03

    […] Left one came from Canon G9, center one from an old zoom lens and the right […]

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