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Having read that these objectives are sensitive – the lenses inside the objective can be knock out of alignment I was a little worried about the transportation. When I got the objectives, I compared them with other lenses that I have and concluded that all three objectives were ok.

MitutoyoObjective lens

Some people regard the Mitutoyo M plan Apo’s to be the gold standard for photographing trough a microscope objective from 5x and up. Having problems with the chromatic aberration with some subjects when I used other non-apo microscope objectives and after seeing some great photos with the 10x lens I bought a 5x, 10x and 20x from a known seller on Ebay.

And yet for the money, it’s surprising just how much you get. While it won’t win any awards for optical quality, it does have two lenses built into its tiny 11 centimetre long body. The main one, if you can call it that, kicks in at just 45mm (just under two inches). This one will magnify any subject, text or numbers two times (2x) their original size.

Immediately below, at the top of the handle is a further 15mm diameter lens giving a more powerful 4x magnification. Go down further for a frosted grip section, then a hole cut-out at the bottom of the handle so you can thread a piece of string, elastic or cord through if you have one.

This mini pocket hand magnifier is one of the smallest and cheapest magnifying glasses you can buy. Made from just a single piece of clear plastic, it keeps costs down to a minimum and makes an ideal first magnifier for a child.

M Plan apo

If you think you might need a very basic magnifier but don’t want to spend money on a high quality one, then this could be an option for you. Taking up hardly any space, and being reasonably robust, it’s one you might wish to squirrel away for an odds-and-ends box in the home, or the car or bag when you’re out and about. Then use it discreetly to read smallprint on food packaging, to check a bill, or perhaps enlarge an incoming text message on your smartphone.

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This small magnifier is one that children will like too. It’s ideal for little hands, and weighs only 14 grams. Use them for school trips, or for nature viewing, or other projects in the classroom. After use, just gather them all up together and rinse clean in a lukewarm bowl of soapy water – easy and hygienic.

The distance between two stripes are approximately 7 pixels. A pixel on the camera I used a Canon 6D is approximately 0.0066 mm (36 mm / 5472 pixels). The distance between two stripes are approximately 7 pixels or 0.046mm (0.066 mm/pixel * 7 pixel). Using a 400 mm tube lens that have twice the focal length of the nominal 200 mm the butterfly wing is enlarged 20x instead of 10x on sensor so the distance between two stripes is approximately 0.0023 mm (0.046 mm / 20). This means that one stripe is a little larger than 1 µm or on pair with the smallest thing this lens can resolve.

When the numerical apperture (NA) is 0.28 and the wavelength of light (λ) is asumed to be 0.550 µm (green light) the resolution (r) can be estimated to approximately 1µm; r = 0.550µm / (2 * 0,28) ≈ 1µm

Print your brand, message or web site along the handle for a low-priced giveaway that ensures your details are close to hand for any existing or prospective customer. Ask us to quote next time you need this, or any other magnifier printed with your logo.

Example photo below, an Issoria lathonia, Mitutoyo M plan apo 10x, Canon 400mm 5,6 tube lens, LPL Copy stand, Canon 6D, Zerene Stacker, Adobe LR & PS. I used a 400 mm lens instead of the nominal 200m because I wanted the good image circle of the objective to cover a full frame sensor. The second picture shows an enlargement just to show the detail you can photographed with this objectives with a 1 µm resolution. The stripes on the butterfly scales are just visible on some but not on all the scales.

Objective Mitutoyo M plan ApoMagnification 10xNumerical apperture (NA) 0.28Resolution 1µmDepth of Field (DOF) 7 µm or 0.007 mmWorking distance (WD) 34mm