Yoshizen's Blog



Since I obtained some Focusing Helicoid, I’ve been testing their best use etc —– so, while testing 36~90mm Helicoid with old antic lens, watching the tree, I saw a squirrel on there.


The lens, originally for a Kodak red bellows Folding Camera, was mounted on an extension of a helicoid and working as a 175mm F10 telephoto lens. (Pretty dark)


I don’t know what the squirrel was doing there, I just snapped a busily moving squirrel. (Though don’t ask fine focus to 100 years old dark lens on an awkward helicoid. — this must be an optimum result for an inpromptuous handheld shot.)  😀


(And I don’t think this photo is showing any good quality —– never mind If I needed I could have used proper Lens. —– and I wouldn’t insist “fuzzy image” for this kind of picture ! —– You can see properly photographed catkin’s image.)


Helicoid Lens (A)

Helicoid Folder(1)-DSC08423

While hibernating in the winter (because, I can’t go ski kind, let alone climbing the mountain, = still have to do something — I made yet another homemade Lenses. (this time using a focusing helicoid sold in the net.)

Helicoid Folder(2)-003

In the political stance, I should re-use other old camera’s lens barrel kind though, they may not come when I want.  So, I bought some focusing helicoids from China such as 12~17mm, 17~35mm, 36~90mm, mostly M42 fitting.  (M42 rear mount / Pentax screw mount can be easily converted to Nikon, Canon, Sony-E with a simple (and cheap) adapter.)


And the lens I used was came from broken Sony zoom lens. (In the center of the photo above, two of the small lenses)

Helicoid Folder(4)-001

So, the game starts = how to fix a small irregular shaped lens to the helicoid.   In here, cut a card-board paper to the shape (Photo left) and mount into an empty filter ring (Photo middle) — and 52mm filter ring was mounted to the helicoid. (Photo right) = to test and check if the infinity focus can be made. —– (this approach failed)

Helicoid Folder(5)-002

And in here, another lens was temporally mounted on a helicoid with soft plastic patty (Photo left) —– Photo middle showed the lens on the previous photo was screw mounted to an aluminium ring which was epoxy fixed on to the 52mm filter ring, and to the helicoid, then to the camera body. (Photo middle and right) —– (For clarity sake, those photos were taken before the mat-black paint was applied

Helicoid Folder(6)-00

This lens, with about 65mm focal length has an Iris ! —– though, the image made by this lens was too bad (except pretty good center) and the effect of the Iris was not much help.  😀

Helicoid folder(7)-Fullmoon-31-01

So, they are the images. (Looks hopeless coma aberration)

My attempt to make homemade lens has been having funny paradox, while making the lens DIY, the image quality was just fuzzy and poor, —– yet still, I’ve been trying to make it somewhat usable. —– ? ? ?    Then the “Enlightenment” came which was “Why not”  It IS the nature of the lens = bad lens makes bad image.  What’s wrong ?  The top photo here was made by this, Helicoid Lens (A) —– I think, this bad image was not too bad.  I like this painterly effect.  Don’t you agree ?  (It seems, the Japanese Zennists are visiting here.   So, those “Play with lenses” are also the demonstration of the “Mind game in Zen”=  “liberate yourself from a stucked mind” “Why not”    Ha ha ha.   😀 )


Junk to Macro Lens = Recycle of Kyocera Zoom Lens

Yashica Macro-1-A09A3208

You might be misunderstanding that I’m playing with cameras for the

sake of blogging. Far from it, behind the scene I’m disassembling

3 times more lenses or cameras.  I only showing them if I found a fun.

In most of the case, I’m doing it just looking for a spare parts or

particular component such as when I needed to get a mirror for an

ultra-low-angle photo-adapter.     —– I was disassembling a Yashica

compact Zoom camera, looking for a Motor and a Gear mechanism.

— Some old film cameras had auto-wind and rewind mechanism which

I could utilize in the other mechanical design.  So, from Yashica, I got

two motors with each gear mechanism, and not only that, I found an

extending Zoom lens barrel seems to be very useful. 

I had used a same kind of barrel to make a focusing helicoid.

Yashica Macro-2-001

This Kyocera-Yashica 38~115 mm zoom lens seem to have a quite 

fancy design.  Front group convex lens has a Canon like Arc-formed

motor for focusing and having aspherical lens, and rear group is pure

diverging concave lens.   And I found the front group lens works well

as a macro lens (used in reverse) = So, mount the lens into the

extending lens barrel = Here I have a x1~x3 (about) macro lens.

Yashica Macro-3-001

Yashica Macro-4-001

This front group lens had a Shutter-aperture-combined blade which

I removed therefore there is no F-Aperture = always fully open !

—– still, this sample photos showed rather good quality and giving

beautiful out of focus bokeh.

Kyocera Macro-354-001But with further test, lens showed strong curvature of the image =

image is not flat = good for 3D subject but not good for a flat object.

(When lens was designed, the aberrations, inherent to any single lens

were corrected by the combination of the other lens.  Yet, in this case, 

such strong curvature of the image needed to be corrected by the 

strong diverging lens of the rear group.  But, as only front group lens 

was used here, the uncorrected aberration became too apparent.

—– Photo above Left showed x3 image.  Its coloring was caused by the

Chromatic aberration.  Photo Middle (x1 size), the best focus was made

to peripheral.  And the Right, best focus was made to center.   The focus

to the center is 4mm different ! = If the subject was 4mm deep shallow

dish, this lens will make a good focus from center to the corner.)

I need to find a good subject. = Ideally, Halloween Costumed insect.   🙂


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