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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