Cause of Broken Zoom

———————— (Photo above, Right — Note a clack in the white nylon gear )

Yet again, this is about the same broken Sigma Zoom Lens.

While examining the mechanism, electronics, I’ve been puzzling why

this lens was not working.   It seems everything are functioning. —– ? ? ?

—– Then I noticed, when the AF motor was connected to the battery

and rotating, focus mechanism only moves a little.  In both direction,

gears rotates only short time even though the motor was kept running.  

—– On the end, I discovered,  a gear connected to the motor has a clack, 

so, it’s loose from the shaft and slipping.

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In theory, it is easy to replace the gear like this, which is not expensive.  

BUT in practice, in order to access this part of the mechanism, the whole

lens has to be disassembled. —– Considering the time and the expertise,

just  change a small gear which cost (to the Sigma) may not be more than 50P,

still the service charge would be more than £100.  

= good second-hand would be even cheaper. 

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In my life, I rarely paid a service charge to the camera company.

 1) I don’t brake a camera.   2) If it started malfunctioning, I repair myself.  

3) If it was beyond repair, I disassemble and use it for experiment. (and have a fun !)  

4) Being as a technical writer, the service engineers are my good friend and to keep

cosy relation, camera company wouldn’t charge us.  (often, broken camera is a bad

news which the company want to keep it  in secret.  

And our feed-back is indispensable for them. )

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In principal, the Gear shouldn’t break, still, as I saw the broken gear like this

only  the second time, it is rare occurrence.  = it should be OK

= and if it happened on you,  you are extremely unlucky.  

Have a pint or two and blame the God.  🙂

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B/W Photo

Well, not quite.  Never mind, it’s a sort of.

They are  x10 Macro shot. —– In order to have something significant image

out of bird’s feather, it needs to have  x50 magnification.

I still couldn’t figure out “How bird can make a egg” —– I mean

it’s technological aspects.

Not mention, How their Feathers were made ?

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F-Aperture / Iris Control (2)

This is the up-date of the post with the same title before.

The temporally test circuit of the Iris control then has been made to

a proper board.  Still, where to put the battery hasn’t yet fixed.

(At moment the power was connected through the cables.)

To make the drive circuit of Iris control was rather simple (= Just put the

necessary components on a piece of strip board.) though, where to put the

Open-Close Switches gave me a headache.  —– Ideally, it should be inside of the

Camera or make the Camera’s shutter button function for the trigger of this Iris

control too.  (Asking too much !)    Or, alternatively, put the Iris Close Button

right next of the shutter button and press both of them in the same time.

—– On the end, I decided to use the Camera’s remote trigger switch.  

Remote trigger switch is double switch.    First half press activates the

auto-focus then deeper press trigger the shutter.  Though, to the hand made

macro lens, auto-focus switch is no use.   I decided to use this switch to close

the Iris, and put a change-over switch to select  either Focus or Iris close.

(The button to Open the Iris was put the back of Remote trigger.)

In this setting, Focus and Framing can be done while Iris was fully open,

then the press of button, first close the Iris then expose the picture.  

With a use of  TTL Flash-light, almost automatically a photo was made !

—–  a short coming was, as the trigger was made by Remote Switch in the

left hand, camera was held almost right hand only. = a bit heavy.  😦  

Still, the Camera in the free-hand, then just click the shutter and enable

to take picture is a great convenience.  🙂  🙂

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Self-sacrifice — is it same to Selfless ? ? ?

Time to time, a search-term “Self-sacrifice” came to here. = It seems, the Self

is the main issue of Buddhism, Self-sacrifice and Self-denial is always taking

quite an attention.    And in deed I myself talked about this in the past.

= I wrote that to reach Zen or Buddhism understanding, it is necessary to

have a self-denial or a self-sacrifice in a certain stage of

the pathway to see who the own Self is.

Though, the Aim of Buddhism is not “Wrestling with the SELF”= try to

eliminate and struggle.   But Being Buddhist is simply being selfless,

since the Self is not exists in the first place.

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—– You might be confused. This is the same situation like a “Disease”

= say XYZ syndrome. People may talk about what that syndrome is,

how to treat or eradicate it.   Though the teaching of

Lord Buddha didn’t mention the existence of such disease.  Such disease exists

only in one’s mind = NOT exist mean no point to know about alleged symptom,

let alone how to deny or eradicate it. = In other words, to think Self-denial or

Self-sacrifice as if it was the essence of Buddhism is, utterly a misunderstanding

= Here is a man trying to find and use a fire-extinguisher —– shame, there

wasn’t a fire, he only thought it was.

Don’t mix-up “to know, Fire is not exists” with extinguish a Fire.

Deny the Self is not close or same to the Selfless. Deny mean, the Self has been

 defined  and confirmed of its existence !  = Wrong direction to start.

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In our daily life, fundamentally there isn’t a conscious of Self,

hence things were done Selflessly.

So that, while reading this blog, have you been aware that your eyes are tracing 

the line, not mention that YOU ARE reading this.   YOU are in deed, doing all those

unconsciously. = Since you were alerted, now you became conscious of YOU.

Otherwise you didn’t need to become conscious of yourself to read this — in fact to

do anything or to live.   Ironically, human got over-sized brain and so-called Mind,

even worse got Selfish Ego and Greed kind.   When ever you were alerted and

became conscious about your “right” or “gain or loss” this kind of “Mind” often gave

us the interruption — “Hey, it’s a chance” or “Don’t loose” kind.   🙂

Lord Buddha found that this “Imaginary products” is the cause of all the troubles

even though, we can have a life without it.    And found that the idea of SELF, the

generator of all those Mind is the root cause, despite it is nothing but an illusion.

So, he taught to have “Clear eyes and the Mind” to distinguish the illusion or delusion

and the Truth. —– Yet still, we poor human tend to cling own Self and accompanying

sense of Self-loving Emotion, so that, when we do something for ourselves, we can not

handle it in the detached clear eyes and the mind.   The emotion which bound

the integration of Self is always there.

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In contrast, when we needed to do something for somebody else, not all of us are

very keen = We just do it as an extra task = often with quite detached mind, no

pleasure, even no Self conviction there.

(Let the hands do the work. The mind is somewhere else. 🙂 )

You can see that to do something for others, we do it detached, Selfless manner.

When you do, you do it dispassionate as it was seen objectively in quite rational

manner. = Because, it belong to the others, there is no attachment, still has to do

the job, job would be handled dispassionately as a given task. —– this situation

can be seen as the Self-sacrifice. And the dispassionate detached mind was

mixed-up with the selflessness.

= This was how and why the misinterpretation has occurred.

—– Self-denial or Self-sacrifice is not an idea of Buddhism.   Still, if there was a

situation to DO, real Buddhist would just DO without any question, since

there was no Self, therefore no wrangling Mind but the Karma put him to DO.

Though, by the eyes of others, it could be seen as if it was a self-sacrifice because

of it was not his own needs, and it was interpreted that he was forced to obey the

situation while denying his own will, himself.

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But, to see “Do something to others” only in the view of Self-denial or Self-sacrifice

is in deed the most Un-Buddhist like view.

It is nothing but an Egotistic, stingy, small “mind”.  —– Do something could be

a good exercise, do somebody’s work could be new experience — etc etc.

Don’t waste the time clinging with useless mind.      Just DO.

___/\___

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F-Aperture / Iris Control

As I wrote in the previous posts, I have recycled rear element of the

broken Zoom lenses to use for the macro photography.  Both of them were

Canon EF type lens which has an electronically controlled Diaphragm / Iris.

Electronic Iris has an advantage, they  only needs electronic connection,

not a rigid mechanical connection though, this electronics is not just a cable.

—– If the recycled lens was maintained

all the electronics as before, Iris could 

be controlled by the camera side. 

But when the lens was stripped down

to Iris and its Pulse motor,  it is

necessary to create a driving circuit 

for the motor. = And this Pulse motor

needs to have a specific alternating pulse.  

So that a Pulse generator and a Full-bridge

driver would be needed.

(If you would like to know about those pulse motor and its proper control,

please Google  >>> Bipolar stepper driver schematic )

Electronics is a funny phenomena.  It can be elaborated to have Hi-Tech

sophistication but in the same time it still works in a very primitive way.

= Such as the Electro-Magnetic device could be as sophisticated as HDD, still,

if you wind a wire around an iron nail and connect it to the battery, it would

work as an Electro-Magnet and pull the other iron pieces. 

To drive such pulse-motor, there are many IC chips in the market though

most of them are for higher voltage.  I needed to make it using discreet

components = as long as it generates alternating pulses, the Iris works.

(The original driving circuit has a PWM = Pulse-Width-Modulation for

smooth and quiet operation, but here better not ask too much)

The photo above is a circuit to open-close the Iris in the cannibalized

rear element from a Sigma Zoom lens.   (Can drive Canon’s  as well !)   

(Circuit was too simple, I didn’t even bothered to use Prototyping Beloboard

—– just soldered together. = as long as it works, good enough to test)

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From the test, I found the circuit was just enough = no frill, bare minimum.

(Ideally the F-Aperture value indicator may be needed though, in practice,

I may not need more than “Fully open for focus — close down for shooting”

= I decided to put only  two switches, open and close. ~ ~ ~ When the building

work progressed, I’ll show the new photos.  🙂

———————————-

PS:   WP noticed me, this is not only my 602nd Post but this is also the

Anniversary of 5 years  on blogging. —– gosh.  😀

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Junk still a Macro Lens

This is yet another version of the post  “How to recycle / reuse a junk”  

So, you may visit the old posts,  Here and There.  🙂

The Lens here is the same Sigma Zoom lens I’ve used its front element

to make “Wide angle Pinhole” and I’m using its rear element here.

To utilize the rear element though,

I needed to disassemble whole

zooming mechanism to take it out

from the outer barrel.  But instead

to have a trouble to completely

disassemble it, I gave rather rough 

treatment to break a lens barrel.  

(To deal with even Precise Optical

instrument, some time, we need to

use quite a brutal force as well. 😀 )

So, I kept some zooming mechanism to use as a focus adjustment.

The core of the rear optics in the zooming barrel was mounted to

a  M42 to 49 mm thread = Pentax Reverse Adapter.  And mounted to

a Bellows, then to a Canon DSLR body.  = In this configuration, the

lens can give  x5 magnification in the view finder.

Obviously, this massive, awkward set-up is not suits to a field work

—– and anyhow, the subject would be pretty small, it is better to use

on the copy-stand.

This is a test shot on a tablet screen with F-Aperture / Iris fully open.

= This evenness of the quality is not too bad.  

—– In early 70s, Sigma Produced a lens called “Micro-Macro 100mm F4”.

To see the lens, I visited their “Company” in Komae near the edge of the Tokyo.  

It was turned out to be a wooden shack having many lens polishing machine

working on the floor = lots of mess with those lens polishing dark paste.

Sigma seemed to have a knack to correct the aberration in the close range and

the said lens was extremely sharp but also having extremely high contrast

almost like an industrial pattern projection lens.  (So, I didn’t buy.)   

This Butterfly wing became a standard test pattern.  🙂

(This image was clopped to a half = effectively x10 magnification here.)

It seems this lens was the sharpest lens I have in the  x5~x10  range so far.

The advantage is, since their diaphragm / Iris was electronically operated,

once I made a controller, it would be very convenient to use.  

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Walk on Greenwich (2)

Those photos were taken same time as the previous post,

and this is the group of flower images.  Yes, it’s the spring.

And yet more Magnolia.

This is a Rhododendron ! —– It’s crazy.  Rhododendron in March ? ? ?

And this is a Catkin though, I don’t know the Catkin of which tree.  🙂

——————————————–

Those photos were the odd addition. —— round the corner of the town.

Time to time I see Olive tree, still to see it fruiting was very rare.

By the way, this is my 600th post still, nothing special

= life just goes on as Zen.

___/\___

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Walk on Greenwich

Together with a friend who started photography, walking 

the Greenwich became rather regular event.

Anyhow, spring has come and the day was so fine.

And a lots of tourists. (Nothing to do with me though.)

No complaint, or comment. —– why do I need.

(Zeiss 18mm, Tamron SP 500mm on Nikon D810 )

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Good Lens or Cheap Lens

Some regular reader may remember, this lens has appeared here before.

But if you look inside, you may noticed that this one doesn’t have shiny

blue beer can.  = In deed, the front lens is the same though, the panel, and

the pinhole inside is different.  I did swap the panel to single pinhole hence,

it still has semi-fisheye wide angle view but the image doesn’t have a

hallasion created by the Double Density Pinhole.

The front lens came from an ubiquitous cheap Fish-eye Adapter, therefore,

giving fish-eye like distortion and wide-angle view, but being as low cost =

single lens structure showing the Chromatic Aberration.  = Part enlarged

bright-spot of Photo above, rainbow effect is quite visible.

Theory was the same = ” Place a strong concave lens before Pinhole would

creates [Wide angle Pinhole Image]” and this one has a concave lens from a

Canon Zoom Lens. = which is in deed the front element of the same lens I’ve

experimented with its rear element in the previous post.  

And I put the same Double-Density Pinhole panel behind of this lens.

This Canon’s Zoom was EFS type 18~55 mm hence, it was a kind of

medium wide-angle, so that even a front element concave lens was not too

strong = giving modest wide view.  (Though, still having quite a distortion.)

Yet still, the lens carrying the quality of the Canon = this front element

has an Achromatic design = no Chromatic aberration was visible. 

So that, thanks to this high quality Diopt-Pinhole Photo System, on a

full-frame 5D Mk-III camera, I can take high-quality Fuzzy image !

(I’m serious, believe me.   Ha ha ha  😀  😀  )

———————–

IN ADDITION:  This is the front element from a Sigma Zoom Lens.

Lens came from a friend of my friend who gave-up to repair the lens.

(The person managed to disassemble though, couldn’t put it back.)

It seems Sigma was used all sorts of clever tricks to produce the lens

“Reasonable”= not superb, still good enough, light and small, and

most importantly, not expensive for the people of this class.

The front lens seems to be plastic = easy to be scratched (Photo Left)

and the Photo Right shows funny reflection = this is an “Aspherical Lens “. 

You may have a fancy illusion toward the Aspherical Lens. = Yes, Aspherical

lens can give superb optical quality though, these days, it was used as a

magic bullet to save a cost !  (Instead to use many heavy and expensive

Grass, just one plastic Aspherical Lens could eliminates the aberration.)  

Because, Aspherical lens is no longer difficult to make nor expensive.

= Computer give the design and the laser curving can make a precise

die-cast, then the rest would be just a plastic mass-production work. 

As a rather ordinary  x3  Zoom, the strength of the front Concave lens is

similar to the Canon’s Zoom shown before.   The front element consists

two lenses hence it supposed to be an Achromatic design —– though

photo above shows the Chromatic Aberration. (See the rainbow color.)

(of cause, it might be corrected together with the rear element.)

And I put a single pinhole behind of this lens.

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Too Early Spring (2)

This is definitely a Cherry tree though, she already started to bloom. 

(on 10th of March !)

And somewhere in the town, I saw two of the Common Magnolia in full bloom.

This is yet another Magnolia tree.  

In London, the temperature became as high as 25 degree C yesterday.

May be having a warmer weather seems to be better than frosty one

—– though, I’m not necessary comfortable.     It’s something wrong.   

PS: ————————–

I just found this cherry tree in full bloom in the Greenwich.  

I’ve been here around every Wednesday though, there wasn’t a flower

last week —– and suddenly today !   🙂   ( Honest, Believe me.  😀 )

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