Mitutoyo M plan Apo 5x NA 0.14
Mitutoyo M plan Apo

I have used this objective since 2014. Two example photos below, first a Common brimstone, second a Cuckoo wasp. The reasons that I bought this objective is that it is an Apo and that it has a long working distance (WD) of 34mm. I bought the lens on ebay from a known seller but was still a little worried about the transport because this objective type is sensitive and must be handled with care.

Objective Mitutoyo M plan Apo
Magnification 5x
Numerical apperture (NA) 0.14
Resolution 2µm
Depth of Field (DOF) 28µm or 0.028mm
Working distance (WD) 34mm

Resolution r = λ / (2 * NA)

When the numerical apperture (NA) is 0.14 and the wavelength of light (λ) is asumed to be 0.550 µm (green light) the resolution (r) can be estimated to approximately 2µm;
r = 0.550µm / (2 * 0,14) ≈ 2µm

Depth of Field DOF = λ / NA^2

Depth of Field (DOF) is approximately 28µm or 0.028 mm;
DOF = 0.550µm / 0,14^2 ≈ 28µm or 0.028mm

Mitutoyo M plan Apo 5x example pictures

Common Brimstone,
Common Brimstone, Gonepteryx rhamni, Citronfjäril, photo Jörgen Hellberg
Cuckoo wasp Chrysididae
Cuckoo wasp Chrysididae, photo Jörgen Hellberg

This website uses affiliate links. If you use affiliate links the vendors will use cookies to track that you came from this website. This website uses cookies to personalise content and ads, to provide social media features and to analyse our traffic. By choosing “Allow” or by using this site, you are agreeing to our use of cookies.