Yoshizen's Blog

Instamatic Camera (and its 25mm lens)

I found a dear old 110 type Kodak Instamatic Camera (together with their 126 type brother as well) in a junk-box of a camera shop.  This camera shoot 12×18 mm size image with its 25 mm lens. = So, it is possible to put this lens onto Sony A7 camera and see small round image though, if it was a case, have a test on the original camera with a film would be more worthwhile. 

But what I was thinking was, try to expand the image by adding a diverging lens on front (make it to a retrofocus type lens).

But, while disassembling this camera, I was amazed how the designer made this camera complicated.  (Due to the camera has to do so many tasks = wind the film, charge the shutter, rotate the Flash-cube, change the shutter speed for bright or cloudy day, together with shutter click then return the mechanism to the first state) —– Once disassembled, never able to put it back again !   (In comparison to today’s “One time use camera” which is doing about the same with much simpler mechanism,  they looks almost like a hell.)

With an added diverging lens, its became about 32 mm lens though, the image circle didn’t come wide enough to cover the full frame.  (I need to find even stronger diverging lens.)  (Lens quality was just usable with such modification.) 


PS : As I said above, I further tested that 25 mm lens with much stronger diverging lens (which has been used for other “Fancy lens” before) = With stronger diverging power, the lens could have much longer back-focus = hence larger image circle which can cover the full frame.  The image quality of the center was usable though the corner became very bad. —– Then I gave a thought, —– for a technical challenge, I found a sort of the answer though, ? ? ?   DO I need to use this lens ?   = On the end it became rather big = While having Very tiny omnifocus “Fun camera lens” etc, why do I need to use such lens ?  —– The reason why I started to use Sony A7 was, that I can go for shooting with my camera and 3~4 lenses all in my pocket ! =  May be this Kodak 25 mm lens suite only for macro use !

So, I tested this Kodak 25 mm lens as a macro lens, while mounting it on the reverse direction —– with 18 cm extension  = The results wasn’t too bad.  😀

(Photo left was a close-up shot (about  x7) of a Butterfly Wing.  Photo right were the screen of the tablet.)

—– Not so much dramatic outcome though, it was still a fun for one afternoon.  😀


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