Design based on the smartphone macro & wide angle lens. Provide a approximately correct field of view for a 90mm lens @4x5 in the shown configuration, remove the rear eyesight and your eye gets closer and you have approximately field of view for a 75mm lens  @4x5. Masks for 105, 120, 127, 135 and 150 available, same for a 5x7 ratio opening in 110. Masks available for 135, 150 and 180mm in 5x7.  Also available in 6x12 ratio for 100m. Please ask.

What you get, already assembled:

- All 3d printed parts of the base viewfinder, for your focal length.

- Smartphone macro & wide angle lens

 

Nb, Willtravel camera, lens and laser rangefinder for illustration only, thus naturally not part of the sale.

Shipping is as untracked letter.