Graflock-ish sliding tabs for 4x5 large format camera

This design has only been tested with a Lomograflock 4x5 instant back so far. And as not been used extensively yet. I will not be responsible if an attachment to the rear of your camera falls out…!

Since 1949, most cameras 4x5 view camera not only have a spring back to accept standard film holder, but also adopted the system of sliding retention clips found on Graflex cameras.

This very small addition to the back of @KevinValverde_323286's “4x5 Large Format Camera” allows you to, after removing the ground glass holder, clamp in accessories intended to be used with cameras compatible with “graflock” accessories.

I only have been able to test this with the LomoGraflock, a back that shoots Instax Wide film with large format cameras, so far. The intrepid enlarger back, and the rollfilm adapter backs from Horseman are expected to work but I cannot say.

I also intend to make sure this modification will be compatible with Intrepid 4x5 Enlarger Kit but I currently do not have it yet. This is less crucial as the enlarger is used in a static setting, in a darkroom, in an orientation where gravity is your friend if you want use it vertically. Which generally is the common way to go about it.

UPDATE Nov 10 2025: I have received the 4x5 enlarger kit from Intrepid and it is slightly too wide to fit, maybe by a couple of millimeter, and their graflock rails do not extended to the very edge of the part. The pocket for the ground glass is able to accommodate it, if widened by that amount. but the sliding rails that have been added won't be able to grab it. 

A part with the correct size was added, so you can use a Intrepid 4x5 Enlarger kit with the camera. The sliding parts for locking will not fit with that tool, but it should be enough to print. Maybe dedicating a holder to “enlarger” mode?

To assemble this, you need to use 4 M3 brass inset insert to the Voron spec (M3x4x5mm) to add to the 4 holes at the back of the frame. You then use an M3x6 screw and a washer.

The slides and the rear have their top surfaces in contact, which may provide enough friction to hold everything in place positively securely with the tightness of the screw and the tension of the weight of an accessory working against each other.

I suggest tightening the screws so the slides are movable with some force but not free, and I suggest using medium strength thread lock on the screws (the “blue” kind)