How to Add a different lens to a Holga Camera?

First: If you’re adding a lens/mount/etc to a holga, You’re Doing It Wrong.

Second: the cost of adding a lens mount, buying lenses, working out all of that will likely equal the cost of a low-end used Medium Format camera (which I think is what you’re looking for).

My suggestions for used Medium Formats:
– Mamiya RB67 (6×7 format, lots of lenses and equipment available, totally manual—no batteries)
– Pentax M645 (6×4.5 format, also lots of lenses available, again totally manual)

Both are available as used kits in the $300—$400 range

If that really isn’t the route you want to go, you can look at cutting out the current lens, and applying a new mount. You’d need to use “step down” metering for the aperature—that is, you’d need to manually reduce the aperture on the lens before you took each shot, but otherwise you’d be pretty good.

at 3.5 pounds, the RB67 and the like are just too heavy. The main problem I see is knowing how far the mount is from the film plane, and then how to use this to adjust focusing.

@arpinum Fair enough =) The Pentax M645 is a bit lighter, but still pretty beefy.

The best option would be to put the lens mount in the precise same distance to the film plane as the camera it originally came on. If you manage to get a non-operative camera to steal the lens mount from, you could measure it to get the correct location.