Yoshizen's Blog

110 Pentax 24mm Lens test

Considering the image size of the 110 Instamatic was 17x13mm, so that a lens for that camera could able to perform like this on the 35mm full size was rather amazing.  (In fact, inevitable corner fall off is creating even nicer atmosphere)

Such a small lens on a small mirrorless camera is very handy though, to be honest, such convenience makes rather casual attitude of the shooting, and often produce unsharp / blurred image.  I often create blurred image though, it was “when I intended” —– otherwise, it was nothing but a failure.  (another trouble was, that against such small lens, the shutter shock of A7R is comparatively big = tend to make blurred image) 

Such pictures may not have any artistic value still, if we could read the name etc. the details on the goods, there might be a bit more interest.

I wouldn’t pretend any meaning on those images, —– just an atmosphere.

And may be a kind of the test of the lens character.

This photo showed rather interesting phenomenon.  The center is not as sharp as its surroundings = the lens may be showing the curvature of the image.  —– But, I don’t believe such as like the Pentax made a lens having an image curvature.   This got to be what they intended =  intended what = to compensate the curvature of the film. 

I think, other than the Pentax design team, not many people has tested this lens on the camera other than the dedicated  Pentax 110 Auto  body.   Naturally,  the test on the 110 Auto was done by an Instamatic Caset film = which may have inherited curvature of the film though it has been compensated by the lens’ own image curvature.   It’s mean, nobody was able to notice the image curvature of this lens before.  (other than the very Pentax design team) —– How interesting.   😀

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110 Pentax 24mm Lens (2)

I realized that the tiny toy like Pentax 110 camera’s 24 mm F2.8 lens appeared to be very critical lens.  What I mean critical is, as it was designed by the Pentax, aiming to achieve their 110 photo’s quality comparable to full size 35 mm, so the quality of the lens is very high —– and it’s requirement / the standard must be also high. 

In this blog, I’ve been plying with hundred of tinkering job, —– though, its standard is pretty casual.  I’m doing it in my kitchen, without having even an optical bench.  And I demonstrated that how the standard of the optics can be not critical. = typically like “Twisted lens” demonstration or  “F-Aperture control” kind. —– still I could manage those tinkering with good success.   So, when I adapted 110 24mm lens to Sony A7R body, I just made a hole in a Sony’s body cap and inserted the bottom of the 24mm lens then fixed it by Epoxi glue.  I thought, I’ve adjusted infinity very well (as A7R’s focus peaking works perfect) —– but later, I noticed that the focus was not even = left side was out.

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Yet, the slant of the lens was barely visible = the lens may not off the straight perpendicular less than 1 degree —– though, lens was short focus 24mm, and it got front focus system, of which only 2mm of front lens shift makes the focus from infinity to 0.35m.  It’s mean, even less than 0.1mm off position on one side would spoil sharp infinity image. (Especially, here the lens is always fully open F2.8)

There was a funny paradox here.  24mm lens for 110 Pentax was a standard lens, = obviously, the lens for 110 Pentax was expecting to be used and worked as a standard lens.  But the same 24mm lens for 35mm camera was a very wide-angle. Therefore, while 24mm lens for Nikon was having distance scale  ∞, 3, 1.5, 1, 0.7 —m, 24mm lens for 110 Pentax has much finer scale  ∞, 8, 4, 2, 1.5, 1, —m,  and the focus seemed to be also quite critical.  (But, to fully satisfy those potential in the Pentax Auto 110 needs to have very delicate, fine handling while see the image in its small SLR view finder —– though, as the 110 body here was broken and I couldn’t see the finder image, I can’t tell if their aim to make hi-quality image was materialized by this system as a whole or not.


 

Rather Blured image

Ultimately, on the photography, it is irrelevant to know the name of the camera.  Since, the matter is its end result = image.  (Yet still, if you want to know, those photos here were taken by the Kodak Vest Pocket Camera lens on the Sony A7R body.) 

(Incidentally, do you noticed that the guys behind the gate of the Downing street holding a machine-gun.) —– now you must be convinced, that they looks like holding one, —– don’t they ?   In deed they really looks like so.  (you know it’s all in your mind —– you are only seeing my dubious picture)   😀

So, we are seeing what we want to see.

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110 Pentax Lens on A7R

OMG, —– I found a EOS 620 body and a tiny Pentax 110 (both of them were broken junk state) for hefty £5 in the odds & ends box of the City Camera Exchange, Strand Shop.  (They got the best junk in London as well as the latest expensive cameras, and if you feel hungly, you can have the best lunch or dinner in the Simpsons, only few steps round a corner.)   😀

EOS body may be used as a display dummy for my (Canon mount) homemade lens, and the tiny 110 Pentax lens, should make a good fun to test it. 

To test this Pentax lens on Sony A7R body was very easy = just mount the tiny lens on an A7R body cap — Infinity focus was happened to be almost straight.  (but there is no Iris as the camera was designed to give an Auto-exposure by Aperture and the Shutter speed combined system.  = So, the lens works as a 24mm F2.8 only lens, and the focus works very well. (If your finger is small enough to pinch its small lens front)   😀

As the lens is rather bright F2.8 = focused depth is quite shallow yet still, the image where focused was very sharp and crisp.   Though, since the lens was designed for 110 Instamatic size, image circle doesn’t cover the 35mm full screen of course.   (and I wouldn’t attempt to make it Retro-focus with a concave lens to spread the image.)

Don’t to be fooled, even if the camera, lens were such small, like a children’s toy,  Pentax seemed to designed its lens with their full force. = image was such crisp = I would say, too prosaic !  The lens showed no chromatic aberration, in fact it got no aberration at all.  (May be in reverse use, lens may work as a pretty good macro lens. —– I’ll test it on future.)

Still, such small lens on the small mirrorless camera is very comfortable and CUTE ! = I wouldn’t complain the dark surroundings.  Its a own character and a part of fun.

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Expression

Following the previous post, this is the even more enigmatic piece.   In fact, I just lost a word and got my jaw dropped.       I’m not sure, whether I can call it a dance —– or just an expression happen to be on the body ?

(The viz looks quite dark and mysterious, even nightmarish. —– and that’s I like) The Art in this level would negate all the question such as where it came from or even who made this.  Though, the harsh reality is, we may not able to see the same, after some years or decade as the body of the performer will be lost.   Without the body, its controlled movement and its moment, this art couldn’t exist. —– should we feel sad ?  —– the even harsher reality is, the memory, and its container = brain will be also rotten in the same time.    Who said art is long ? —– (Youtube viz may last longer —– yet it’s horrifying to image, after all the living things extinct, still those video data will remain as the electronic form like a fossil stone. 

Those two above were more like commercial dancing still showing some relation to the first piece.      (They are quite beautiful.)

What ? ? ?

Among the viz from the net, this is the one, made me puzzled the most. —– sound somewhat eastern Europe / gipsy ?  (the Brass sound even Mexican.    😀 )  —– Was this originated from southern India ? = it’s mean brought by the gipsy. —– then after many clicks, I discovered that, WITH MY AMAZEMENT, the music was  Polish folk-song.   Still, I don’t know where the style of the dancing came from, how the costume was designed etc.etc.  ? ? ?

(This one got only the same sound —– just give a hint of what they were !)

In the world, there are so many what we are completely out of imagination.

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To the Center (Shot by Vest Pocket Lens)

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There was even a single grain of rice left to eat. = Noway else, I had to go to the center for shopping —– with Vest Pocket Lens on the A7R.

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Vest-Center(4)- Oct'-002

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Vest-Center(7)- Oct'-003

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Other than a Moon shot, Vest Pocket Lens is not too bad (for general use.)   (May be better than phone-camera —– if we disregard the thousand pounds cost of camera body)   😀

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Moon by Non-telephoto lens

I took a picture of the Moon too many times = It’s the same moon for the millions of nights = So,  I’m rather weary to take out my 500mm lens = I just clicked a camera with the lens happen to be on.

272-274-VP

The camera happen to be the Sony A7R with a modified Kodak Vest Pocket Camera lens on.  With this structure of the lens, we can not hope a good focus.  Still, whatsoever the picture was made as this.  (Since the Vest pocket camera had no focusing mechanism, I wonder how the picture of the moon looked like on the original camera ? —– I haven’t tested it yet.  Sorry.)

IKONTA

As the lens on A7R is easy to change, I put (yet again a modified) Zeiss Baby Ikonta camera’s 50mm lens. (This lens has front-focushing = And, it was set to infinity though, the image was not sharp at all. = You may say Don’t ask too much to 90 years old antic. —– generally this lens works well = but may not for a real infinity subject.)

(In both shots, the F-aperture was fully open,  VP = F6.6 / Ikonta was F4.5 and  1/250 or so shutter speed —– because I was not intended to make any sharp image = otherwise why do I used junk lens ? )

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Banksy’s Art !

There was an auction in the Southbey in London.  A painting (or splayed stencil) of Banksy was said to be sold for a £ million.  Then, at once, the picture was shredded itself by a built-in shredder. 

—– there always somebody, much cooler person in this world ! 

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Screen shot by Soft lens (2)

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I found this pretty image in the net.  The original was much sharper, rather normal picture.  When I took screen copy using my homemade Mag lens, in order to avoid a moire, I gave a bit of off-focus.  It was a character of the Mag Lens, when it was off focused, the image suddenly increases the aberration thus, the image become nice soft picture.

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This image was not as much as off focused like the first picture. (Just enough not to see the screen pixel, hence neither moire)

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Then give a bit more off-focus.  —– Isn’t this picture looks more sexy ?  (Shame, I was not the photographer to see the lotus flower in the first place)

I think, now you were convinced to appreciate soft image !

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