Mitutoyo objective type

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jin
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Joined: Sun Aug 26, 2012 6:35 am
Location: Singapore

Mitutoyo objective type

Post by jin »

Hi,

Can someone educate me will i gain or loss anything for visible lights imaging (for micro stacking with external flash light) using Mitutoyo M Plan NUV (or NIR) vs the conventional M Plan APO ie., 10X, 20X and 50X.

Thanks in advance.

rjlittlefield
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Post by rjlittlefield »

I do not recall that anybody has run tests head-to-head for these lens.

However there is a discussion at http://www.photomacrography.net/forum/v ... 6677#86677 that addresses the question from general principles. The conclusion is that the NUV and NIR lenses will behave more like achromats, not apochromats, in the visible range. That is, the correction for color aberrations is expected to be not as good.

--Rik

jin
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Joined: Sun Aug 26, 2012 6:35 am
Location: Singapore

Post by jin »

Hi Rik, thanks for the info and link provided.

genera
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Location: California, USA

Post by genera »

rjlittlefield wrote: . . . . .

However there is a discussion at http://www.photomacrography.net/forum/v ... 6677#86677 that addresses the question from general principles. The conclusion is that the NUV and NIR lenses will behave more like achromats, not apochromats, in the visible range. That is, the correction for color aberrations is expected to be not as good.
--Rik
The idea that an apochromat is corrected at only three wavelengths is obsolete or at least too generally applied here.

"Applied Technologies for Products" - Mitutoyo Corp. http://www.mitutoyo.co.jp/eng/technolog ... uction_03/
"4-2. M Plan NIR Series / LCD Plan NIR Series

Products in this objective lens series are able to correct chromatic aberration throughout the visible light spectrum and the
near infrared region
, as they feature an ultra-long working distance objective lens with enhanced functions that boost higher
transmissivity in the near infrared region. The LCD Plan NIR Series also features a glass cover (thickness t = 1.1 mm or t = 0.7 mm)
specially designed for the LCD.

4-3. M Plan NUV Series / LCD Plan NUV Series

Products in the M Plan NUV Series use optical glass that improved the quality of transmissivity in the short wavelength region, and
they are able to correct chromatic aberration throughout the visible light spectrum and the near ultraviolet region. An anti-reflective
coating has also been developed for these products, to help maintain high transmissivity up to the short wavelength region. Like NIR
Series products, these products uses an objective lens (t = 0.7 mm) that is specially designed for LCDs."
Similar information is available from Olympus, Zeiss, and Nikon. Zeiss claims correction at "up to seven wavelengths".

jin, you'd loose some resolution due to the smaller apertures of the UV/IR versions but you don't need to worry about chromatic aberrations any more that you do with Mitutoyo's non UV/IR lenses.
-Gene

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