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The K750 lens is poor, whereas the 2MP
CMOS censor is actually quite good. The problem with the lens is the degree
of distortion visible on shots that utilise the entire frame. The solutions
is to use a better quality lens, but this means removing the existing lens.
Since the Lense and CMOS sensor are one module, this module needs to be
dismantled to remove the Lense part.
Old digital cameras have massive CMOS or CCD sensors, so when such a
camera's lens is placed so that the image focuses on the smaller K750
sensor, it effectively crops the image (the old cameras have smaller
resolution sensors, but the pixels are bigger, therefore sensors are huge).
This has the effect of cropping the image so that only the centre of the
lens is actually utilised. Also the K750 has more pixels than the
replacement lens's original camera (a Powershot 350 VGA unit). This
means the resultant image on the sensor is very compressed and close up,
like a telephoto lens, with excellent detail.
So here's what I did:
Okay, take one old clapped out K750. remove camera module and rip it apart.
Remove the whole top layer, including the lens itself, leaving only the base
with the CMOS chip exposed:
The lens module (without lens) installed in the camera body. Notice the
mirrored surface of the CMOS sensor. DO NOT TOUCH THIS, the acid on your
fingertips will destroy it:
I installed the lens to the camera using the screw adjustment
from the insides of a pair of binoculars. This gives me the ability to
manually focus close up for brilliant macros, or far away for telephoto
style photos. Focus is difficult since there is no longer auto-focus!
It is easier if you zoom in first using the digital zoom, focus the shot,
then zoom out (since the image on the screen is too small when zoomed out to
focus with any degree of accuracy). Focus is adjusted by screwing the
lens in to focus on distant objects, or out to focus on close up objects:
The lens housing is glued to the K750 back cover. Black tape
has been used to block out light leakage from around the base of the lens
and from holes in the K750 back cover (example, speaker grill).
And for added image colour quality, a UV filter (removes "blue" tinge):
Samples Comparison Photos Of The Modified K750 and a stock
K750:
Taken with the modified lens:
Taken with a stock K750:
Check
my thread on
SE-NSE for more examples of images taken with the lens mod (you'll have
to log in to view images). There are also a couple of comparisons at
Esato. Or check my
flickr pages for examples also - search my photos for the tag "k750lm".
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