Yoshizen's Blog

Omuni-focus Lens

Omni lens(3)-003About a month ago, I talked about Halina camera and its lens. —– A story how I made its lens to use on the Sony A7R camera and showed its sample photos.

Omni lens(2)While checking those homemade lenses, I found that the said Halina lens could, (with an additional diverging lens on front, as its focal length become longer) be used with a thicker Nikon body.  So, I further modified to add a diverging lens and mounted them on a 42M (Pentax screw) to Ai (Nikon) mount adapter. = Here I got Omuni-focus lens for Nikon DSLR. (And this work was somewhat related to the other lens)

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I know, this situation is having a silly contradiction.  Why 47.5 MP Hi-Res camera need such low-Res images ? —– Omuni-focus mean, nowhere having a “Distinctive OUT of FOCUS (Bokhe) image” in the same time, no “Clearly Focused image” either.  = Just rotten images spread from top to bottom. ( More like a pinhole photo ! )   

A_Omni lens(4)-006Yet still, those photos above, both far and close subjects, it is a rather remarkable phenomenon, such a cheap plastic lens can make (a kind of) usable image in any distance, without focusing, without using smaller F-aperture.    (BYW, the last dried rose was taken with an additional close-up ring) = Omuni-focus is not necessary an almighty.)

A_Omni lens(5)-007And those comparison photos were for academic interest.  Left was by this Omuni-focus lens, and the right was in deed, a pinhole photo image !

Now, my point must be clear, not necessary only decent sharp image could be a good photo.  (Though, I’m not implying my fuzzy image here IS a good photo.  😀

Omuni—– May be not a good photo still, I found that those fuzzy images appeal to our deeper psychology. —– I had distant memories in my subconscious, I might have seen this long long time ago —– may be even on my previous life ? ? ? ) 

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Stacked Lock Pin

Locking pin(1)-SZ lens

When I took those photos, I’ve used additional close-up rings on the SZ lens.

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Close-up rings I mentioned were those kind. (Though, this photo left was when I blogged about the lens from an Instamatic camera)  The Nikon mount SZ lens was attached by “Ai to EOS” adapter.   But the adapter stacked on the EOS Close-up ring.  So, I needed to hammer down the Lock pin to release the Ai adapter from the Close-up ring. (Photo right)  In fact I was lucky as I could access the pin —– if an EOS lens was stacked, (so, the pin was hidden inside) I needed to use a hacksaw to cut open the ring ( = the saw-dust might got inside of EOS lens and creates even further trouble etc etc.) 

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What I found was, the lock pin was too long ! = It protruded from the ring, hence, even the release-lever was pressed down, pin was still blocking the Ai adapter to rotate.(Photo left)    The pin needed to cut and make it short.  And to do this, both side and other side of the ring was covered by the masking tape first, to prevent an accidental touch of a file to make scratch. (Photo middle)  Then file-down the pin (Photo right), till the pin never protrude from the ring surface when it was pressed down. (check it like photo left again and again).

Close-up ring like this (not necessary red color = blue, gold etc all very colorful) was sold in Ebay a lots, mostly about £25 for set of 3 though, I found this for £15 = may be it was “the rejected seconds” rejected from other bender = somebody throw it away = then, others picked up for opportunity (= any business is the busyness in China = remember, they made a cooking oil from the sewer remain !)  Still I’m buying a lots of staffs (adapter ring kind) from  China/Ebay —– while keeping eyes on its work (I’m not asking them to be a perfect, but at least it wouldn’t harm others ! —– since, I’m a very generous Zen Buddhist.   Ha ha ha   😀  ) 

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It was a full moon !

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In the evening of the New year’s day, I noticed a moon behind the trees.  I thought, Oh, it might be a full moon, though, before it came to the center of the window, the sky got cloudy.

Yet still, you can see the unusual “Norwegian Moon rise Photos” in the Bentehaarstad Blog. —– not only that, you will find many many very interesting topics and the photos in her blog (click the links in the bottom)  I’m sure you will enjoy them.   🙂  

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SZ Lens (for Nikon)

SZ lens(1)

Since I failed to make the NZ lens for Nikon use, I tried it again with similar Sony lens (18~200 F3.5~6.3, A-mount lens which has been dropped and internally broken—– I think I got it for £5.)

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Having had previous experience, this time I planed the lens (front compound lens element) should be mounted recessed inside of the barrel. = mounted inside still not block the movement of the zooming barrel —– and all those massive work was what I’ve been doing past 2 weeks or so. = hence no party, no dancing  😀

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Whether those 2 lenses were using same design idea or not, they were having some similarities.  Front lens seemed to be about the same size and the shape, though their character seemed to be very different.  Unlike the worst lens of NZ, this SZ (for Sony Zoom) showed rather decent quality as you can see on those test shots image. (mind you, there is no iris = 100 mm lens / fully open as about F2,  but not necessary giving beautiful softness.)

SZ lens(4)-003

Something what I found remarkable was that this SZ lens got quite good macro capability !   (Those shots above (original size) were with additional extension ring.)  (Further test shot image may come soon or later.)  😀

It’s a funny irony, Nikon lens was used for Sony and Sony lens was made for Nikon. —— (I didn’t play such game on purpose —– It was just an unintended consequence.)

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謹賀新年

Posted in Awareness, Cyber Space, Existentialism, Fun to read :-D, Paradox, Who is Yoshizen by yoshizen on January 1, 2018

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Well, having pretty noisy firework somewhere outside, it seems the new year has come. —————— ( not much significance to Zennist though — )  

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Without cheating, this IS really the morning sky of the first day of the New Year.  (1.1.2018  7:56)

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NZ Lens

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Before, I’ve made close-up lens out of a front element of the zoom lens.  So, I wanted to make something different from this Nikon zoom lens. (AF-S Nikkor 18~200 G ED)  Conveniently, the front element of this zoom lens extend  = it’s mean I don’t need to look for a focusing helicoid to use with this lens. (It’s already there.)  😀

NZ(2)- lens

The matter of conversion was, to mount the separated front lens unit to a camera body.  There was a possibility to make the lens for Nikon mount. —– but on the end, I found that, unless I could trim off yet another 2.5mm from the lens barrel, it was only useable on Sony E mount.  The photo above was showing how the glue-up connection was made. (Aluminium ring was glued to the lens barrel first, then it was stick to the body mount.) (First plan was to mount the lens unit to a lens reverse adapter for Nikon though, as it couldn’t get an infinity focus, plan was changed to Sony = an adapter to use EOS lens to E-mount was chosen for its matching diameter.)

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So far this lens is the heaviest among my homemade lenses.  Looks a bit strange though, it would give an impression of some kind of professional gear, not a homemade mock-up.  😀

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Photo above are the test shots of this NZ (NZ for Nikon-Zoom) lens.  It looks the most murky, fuzziest image out of my many homemade lenses.  It was not a kind of light scattered halation — much more fundamental = light is not focused to single point (worse than spherical aberration and the image field was curved) —– Mind you, against its focal length (about 100mm) the diameter of this lens is 60mm =  it’s mean, 100mm lens brighter than F-2.  Well, unless it was a few thousand pounds lens, no designer would give any guaranty of the decent quality for such bright lens.—– If I could produce decent sharp image out of this lens, it is a fraud. 

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G9 Snapshot of the town

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D850 with G9-001

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D850 with G9-002

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Well, they may looks all same.  😀       The shot by a homemade G9 lens on Nikon D850.     A kind of mystery was that D850 recorded this lens as a 50mm F2 lens = it’s more or less correct  (F2.5 was more likely figure though) —– How they found this ? ? ? 

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G10 Lens Test

This is much awaited G10 lens shot !  (Oh, really ?  Who did wait ?)

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It’s funny to see, are they the graffiti or the cover of the construction site ? (Good idea.)

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I’m not sure whether the subjects were hopeless or just the images ? ? ?   😀 

(You must be convinced that to show the image, fine quality of the lens is not important.)

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Snap the town by Mag lens (3)

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How weird ! ? ? ?  (of the image of Mag lens or my eyes ?) —– I know.   😀

(I’m going to further this with G10 lens etc — some may say, It’s an obsession.) ——– Oh, my my my, it’s snowing.

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Snap the Town (by Mag Lens)

6Dec by Mag(1)-DSC07676It was nothing to do with Xmas though, I went to a camera shopping.  Alongside, I had my Mag lens, Fun camera lens, Sony A7R with me.  (I made a fun with shop staffs while testing D850.)  On the way back, I did some snap shots of the town-scape.  (All of them were shot by Mag lens except the last one which was by Fun camera lens)  = Have a fun.   😀

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6Dec by Mag(9)-DSC07688

How’s that ?   😀

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