KDS-POTO2

KDS-POTO2 is a camera designed and produced by myself – with lens from waiwai / shutter plate from Holga.
The overall production time (with drafting and designing) took around 2 months. Here’s how it looks like.
and here’s its features list:
1. swappable lens – waiwai 17mm lens / pinhole lens
2. swappable back – 135 / 120 back
3. bulb / normal shutter mode
4. single frame counter



It is a record of how I made it.
first of all, I keep drawing lots of drafts whether or not i can actually make it
just do the design and technical problem will be solved

1. DESIGN
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initial design 1 – as I’ve did KDS-POTO1 before, I sort of understand the basic design of it,
but when i am designing KDS-POTO2, i have a sense of… wait, i can do a changable back…
so on this draft I started to draw a front shell with knobs + adaptor and back is the core but separtate thing

initial design 2 – more refined drawings

135 back’s design


120′s back design


anti roll back gearwork – stop film from loosing or rolling back

lens adaptor – so that pinhole lens / waiwai lens can be utilized


shell locker – to hold the back in place after loading film

2.Testing
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as I’ve stick up KDS-POTO1 before, for the shutter plate, film distance from the lens are understood alread – so no more testing of focusing problem by semi-transparaent paper…

instead I’ve did some testing on gearwork with spring

and put it practically,

3.AI file design
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this is a long long part to do up the design in an AI file
have to consider the thickness, have to be very precise on any part
and as I am using a “sanded” acrylic board… orientation of the design matters !
(else some shiny faces will have to show up on the outer shell – which looks really bad if so !!!)

here’s the laser-cut acrylic board with my AI file

4.Sticking it up !
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to stick up acrylic board, Chloroform is to be used

and it will crystallize


many other tools

a. the film frame counter module

the basic framework which film can pass through

with the 8-legged gear – it rotate once = 8 holes passes = 1 frame of film passes !
thx my friend “iamwen” to enlighten me on this gear XD

with the top part stuck (there’s a triangle mark there for you to see if 1 rotation has been made)

b. the anti-roll-back gearwork

spring with the leg

the gearwork take-up spool

when they combined – (just work as the video above)

c. the shell

shell with lens adaptor


behind it there’s a holga shutter plate

d. waiwai lens

remove the lens module from waiwai – including the lens holder

cut up the edges

put it with the adpative rings – with the hood stuck to it, it will be done

e. pinhole “lens”

get a piece of plastic

sand it till the center part is very thin

pin a hole on it

stick it to the lens ~ done !!!

5.Putting everything together
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put a film roll for testing

here’s KDS-POTO2 with waiwai lens :D

6.Sample Photos
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by KDS-POTO2 with pin-hole “lens” :

by KDS-PTO2 with 17mm waiwai lens:

some double-exposures: