Materials
You'll need the following:
1- ONE Holga & lens cap; a spared one preferably because you WILL destroy it.
2- ONE 'Canplas' brand '1-1/2" ABS-DWV Trap Adaptor' bought from OSH (also available @ HomeDepot and likely @ Loew's); more info on this later.
3- ONE M-MOUNT BODY CAP bought from eBay.
4- ONE black masking tape. I like the pH neutral kind because it has just the right amount of adhesiveness, not too gummy either.
Tools
Tools you'll need:
1- One screw driver for small screws.
2- One sharp scissor.
3- An Xacto or utility knife.
4- One mini hacksaw.
5- One 'Dremel' brand or equal, polishing and sanding drill bits.
6- One 1-1/2" hole saw.
7- One electric drill. Don't make the mistake of buying a huge ass drill that weighs like a brick.
8- Drill bits of various diameters.
Say Buh-Bye to your Holga
"Buh-Bye"! I don't know what else you can do with a plastic camera with no lens. Use it for parts? Fill it with concrete and use it as a door stop or paper weight?
Anyway, remove the back cover and disassemble the lens unit.
Detach the Lens Housing
Here is the inside of the Holga. There is a 6x6 film adaptor, take that out to reveal the two small screws at top and bottom. Remove the two screws.
Unscrew the Shutter Mechanism
See those two long tube thingy sticking out? Those are the holes for the two screws you just removed.
Now, unscrew two more screws from the circular whatyoumacallit to completely separate lens housing from body. You can sever the yellow wire if you wish.
Figuring out the Focus
Using the original Holga as model, I will try to make my final product as close to 1-11/16" in height as possbile. That might give me the focal length needed to be in focus at infinite.
Removing the Last Screw
Remove the last screw to completely detach the Holga lens barrel from the shutter housing.
The New Lens Barrel
This is your new lens barrel, available at Osh or HomeDepot. Its full name is- "Male 1-1/2" spigot x slip-joint trap adaptor with washer and nut", and yes, you have to say it in one breath. See the next photo for an actual store sales tag.
Osh carries the 'Canplas' brand, while HomeDepot carries the 'Nibco' brand. The only difference is Nibco makes a white screw-on nut.
Actual Sales Tag at Osh
Print and show store clerk.
Unscrew the Adaptor
Basically-
- The modified Holga lens will be attached to the top of the screw-on nut (#2).
- Then it will be screwed on to the spigot (#1) for focusing.
- The m-mount body cap will be attached to the bottom of the slip joint (#4).
- Trash #3.
Cut Slip-Joint
With a mini hack saw, cut the slip-join end of the adaptor, leaving just about 1/8" max left. This 1/8" will give you the right focus at infinite.
Smoothen all uneven edges, and trim sharp edge that are sticking out if you're using glue. Me? I am a masking tape kinda guy, so I am not going to bother with sanding.
Core-out the Body Cap
With a 1-1/2" hole saw/drill, remove all the plastic in the center leaving you with just a ring with m-mount teeth on it. 1-1/2" is a near perfect fit, but remember to drill from TOP as the 1-1/2" hole saw won't fit through the bottom. Picture shown here is the cap's bottom.