This Instructable shows how to build your own high-quality wooden lensboards. We'll show a simpler construction that works for some large-format lenses, the standard construction, and a variant of the standard that provides an interchangeable mount accepting any of a wide range of lenses -- without the need to swap lensboards.
This instructable is the logical inverse of http://www.instructables.com/id/Large-Format-Adapter-For-Your-Mirrorless-Camera/ . There, a back was created to allow a mirrorless body to replace the film in a large-format camera. Here, you'll learn how to build a front lensboard, including a special type that allows any lens that could mount on a mirrorless body to mount on your large-format body. Why do this? Well, lenses designed for smaller formats will not cover a large format at infinity, but this adapter will allow you to use them as tilt/shift macro lenses -- and many will cover 4x5 at macro focus.
Step 1: Stuff You'll Need
The next thing you need is an understanding of which of the three types of lensboard is appropriate for the lens(es) you want to use. The photo shows examples of all three types: barrel lens with mounting flange, barrel or shutter mount with rear locking ring, and generic (E-mount) bayonet flange. This is roughly in order of increasing build difficulty, although none is all that hard to make. Step 3 only applies to thick lensboards that must have thin edges. Each of Steps 6-8 is specific to one of the three types of lensboard shown in the photo here.
So, what else will you need? Read the complete Instructable before building anything, but here's a rough list:
- Material for the board; probably scant board (you can get various nicer woods for a few dollars via the Internet)
- A saw, etc., and sandpaper to cut and finish the board to size
- An adjustable hole saw or other device that can make a hole in the board
- Paint and brush or other finishing materials
- A cheap extension tube set -- the kind with front, back, and three screw-threaded in-between segments
- Glue for setting the extension tube in the board hole