Introduction: Lens Scope Converter

By Let's dfab!
About: I am interested in designing something curious but functional. Please take a look at my summary page, https://shiura.com/dfab/index-en.html

This adapter converts Nikon F-mount lens to a telescope.

  • You need PEAK TS1961 10x loupe as an eyepiece
  • Wide angle of view (~40degrees), long eye-relief (~20mm)
  • The image is inverted

Supplies

You need

  • Nikon F-mount lens with aperture ring (G-type or E-type lenses are not suitable)
  • PEAK TS1961 10x loupe or its compatible (Nikon version exists, shown at right above)
  • (optional) 2mm tapping screw

Attachments

Step 1: Print and Assemble

  • Print the thing as supplied posture. No support needed.
  • A bit finer layer height would be better to form precise thread (ex. 0.15mm per layer)
  • To fix the adapter to the lens securely, use 2mm tapping screw.

Step 2: How to Use

Open the aperture as wide as possible (smallest F-number).

FAQ

Q1: Is the magnification ratio?

A1: magnifcation ratio = (focal length of the lens) / 30


Q2: Which lens can we use?

A2: You can use any F-mount lenses with aperture ring. Since G-type or E-type lenses have no aperture ring, the aperture is closed when the lens ls detached from the camera body.


Q3: What conditions for F-no. of lens?

Q3. F5.6 is sufficient. Faster lens makes the eye-point more flexible.


Q4: How about adding tripod socket to the adapter?

A4: To avoid the trouble of dropping lens, I intentionally omit tripod thread or lanyard holes. Please use lenses with tripod seat.