Mounting: Thanks to 43mm x 0.5 and 49mm x 0.5 threads this lens is easy to install once you purchase the necessary step-down adapters.Test Notes:

Thorlabs

Mounting: This Raynox does not have any front threads so its just about impossible to mount this lens as a tube lens. I use a donor Sigma LSA, removed the glass, and use glassless mount hold this lens. There is a step in the LSA adapter that fits the back side of the Raynox so the lens is always centered.Test Notes:

The Mitutoyo 5x M Plan APO was for this comparison since it's one of the most popular objectives used for photography, and thanks to the objective's sharp flat field and excellent chromatic aberration correction, any aberrations introduced by the tube lens would be easily noticable. In addition to being infinity-corrected, Mitutoyo objectives are completely corrected in the objective so they do not need any tube lens correction.

Center performance isn't bad but away from the middle the quality drops off quickly. Off-center and corners have an issue with CAs and softness.

Mounting: Thanks to 43mm x 0.5 and 49mm x 0.5 threads this lens is easy to install once you purchase the necessary step-down adapters.Test Notes:

Short focus, or using a lens with less extension than is needed for infinity focus means that it is "focused" beyond infinity. This would create an unusable blurry image, but in many cases this happens to work well with tube lenses - as described here. Short focus results in shorter "effective focal length" used here for magnification calculation purposes, so for example the Sigma LSA with short focus comes in a 183mm effective FL, this would give you 0.91 x the Mitutoyo objectives marked magnification, for the Mitutoyo 5x M Plan lens this would be 4.58x.

Mounting: This lens uses common M58 threads front and rear so it's easy to install with easy to find 58mm step-down adapters.Test Notes:

Mounting: Very easy to install an objective on the lens but its just about impossible to get the lens installed in some kind of rigid mount since this lens does not have a tripod collar.Test Notes:

The two main issues with the MT-1 are soft corners and lateral CAs in the center/corners. See the full size image and look at the white edges.

For objects in the same plane, the edge resolution equals the center resolution. However, for objects in an arc, equidistant from the camera, the edge ...

Following Nikons recommended set-up guidelines resulted in a drop in performance, with a rise in CAs and softness in the corners.

To use an infinity-corrected objective for photography, you will need a tube lens in addition to the main objective, or the system will not focus, since the tube lens is a required part of a infinity-corrected optical system. The tube lens can be a telephoto lens, a close-up diopter, or a tube lenses designed for a microscope.

This lens was tested in 7 different configurations, some of these, especially with shorter extension were excellent. Examples of the other set-ups is available here on Closeuphotography.com:

Its hard to believe that Nikons sells the MXA20696 as the current recommended tube lens when its is not nearly as good of a performer as Thorlabs ITL200, also made by Nikon.

The Sigma and Reichert are both good lensed and make a nice image with the Mitutoyo, but the CAs are a little higher than the other 200mm lenses. The pushed down Century was a big surprise.

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To find out if you need to use a tube lens with an objective, it's easy to check, infinity-corrected objectives are identified with the infinite mark (∞) on the side of the lens barrel.

Infinity-corrected objective

Mounting: This lens will require a 72mm x 0.75 step down adapter to install an objective but the lens is easy to mount on a stand since it's equipped with a tripod collar.Test Notes:

Mounting: This lens uses common 58mm x 0.75 threads front and rear so it's easy to install with easy to find 58mm x 0.5 step-down adapters.Test Notes:

This lens was tested in 9 different configurations, some of these, especially those with shorter extension, were excellent. Examples of the other set-ups is available here on Closeuphotography.com: Closeuphotography.com/raynox-tube-lens

Also know as: DCR-150, Macroscopic Lens Model M-150, Model CM-2000 1.5X, +4.8 diopterCloseuphotography.com/raynox-tube-lens

The best lens overall is the ITL200, the performance of this lens was near perfect and it's one of the easiest to mount thanks to an 52mm adapter from Thorlabs.

ExcellentCentury Precision Optics +4 Achromatic Diopter Lens - 8.5 - Overall best at 200mm+AverageCosina MMA Matched Macro Adapter Lens - 5.3

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y = bandstop( x , wpass ) filters the input signal x using a bandstop filter with a stopband frequency range specified by the two-element vector wpass and ...

ExcellentThorlabs ITL200 Tube Lens [pushed down with short extension] - 9.6 - Overall best at shorter than 200Raynox +4.8 diopter [pushed down with short extension] - 9.6Sigma 150mm F2.8 EX DG OS HSM APO Macro - 9.5Voigtlander APO-Lanthar 125mm f/2.5 - 9.5Raynox +8 diopter - 9.5Nikkor 135mm f/3.5 Ai - 9Century Precision Optics +7 Achromatic Diopter Lens  - 8.5Raynox +5.9 diopter - 9.5

The magnification obtained by an infinity-corrected objective is the ratio between the focal length of the tube Lens and the objective. The most common tube lens focal length used by Mitutoyo and most other manufacturers is 200mm.  With infinity-corrected objectives you can change the tube lens focal length to create different magnification ratios at the camera sensor, without compromising the color correction. To calculate the system magnification for different tube lens and objective combinations, you can use this simple formula; Effective magnification = Marked magnification x the new tube lens focal length / the system tube lens focal length.

Short focus, or using a lens with less extension than is needed for infinity focus means that it is "focused" beyond infinity. This would create an unusable blurry image, but in many cases this happens to work well with tube lenses - as described here. Short focus results in shorter "effective focal length" used here for magnification calculation purposes, so for example the Century +4, 250mm lens, with short focus is a 206mm effective FL lens, this would give you 1.01 x the Mitutoyo objectives marked magnification, for the Mitutoyo 5x M Plan lens this would be 5.08x.

A series of images was shot with each lens in 5 micron steps, and the sharpest image was chosen for center, off-center, and corner using Photoshop at 100% actual pixel view. All images were shot as a single RAW files and processed in PS CC with all noise reduction and lens correction turned off, all settings were zeroed out (true zero) and the same settings were used for all of the images. All of the images shown here are single files.

Mounting: With the Thorlabs 38mm x 0.5 to 52mm x 0.5 adapter this lens is very easy to install. Reverse mount with threaded section or the larger end towards the sensor. See the MXA20696 page for more details.

Mounting: The MT-1 is very difficult to install. You can use a Sigma LSA frame to hold the lens in place with the retainer ring. See the website link for more details.Test Notes:

Asphericlensthorlabs

Mounting: The ITL200 comes with 38mm x 0.50 threads but the lens couldn't be easier to install with the optional Thorlabs tube lens adapter equipped with 52mm x 0.75 threads. Reverse mount with threaded section or the larger end towards the sensor. See the ITL200 webpage for more details.

Right click, or two-finger press any image, and select Open in a New Tab or New Window from the menu, you can repeat this to open as many new images as you would like to compare.

Mounting: Very easy to install an objective on the lens but its just about impossible to get the lens installed in some kind of rigid mount since this lens does not have a tripod collar.Test Notes:

Canon 250D Close-up LensCentury Precision Optics +4 Achromatic Diopter LensCentury Precision Optics +7 Achromatic Diopter LensCosina MMA Matched Macro Adapter LensRaynox +4.8 diopterRaynox +5.9 diopterRaynox +8 diopterSigma LSA Life Size Attachment LensAsahi  Pentax Tele-Takumar 200mm f/5.6Carl Zeiss Tele-Tessar T* 200mm f/3.5Nikkor 135mm f/3.5 AiNikkor 200mm f/4 AiSigma 150mm F2.8 EX DG OS HSM APO MacroVoigtlander APO-Lanthar 125mm f/2.5

Mounting: Very easy to install an objective on the lens but its just about impossible to get the lens installed in some kind of rigid mount since this lens does not have a tripod collar.Test Notes:

So a 10x objective plus a 10x eyepiece = 100x magnification. And a 100x objective lens with 20x eyepieces = 2,000x magnification - right? False! False ...

Thorlabs f thetalens

ExcellentThorlabs ITL200 Tube Lens [infinity] - 9.3 - Overall best at 200mmCentury Precision Optics +4 Achromatic Diopter Lens [pushed down with short extension] - 9Raynox +4.8 diopter - 8You can’t go wrong with any of these three lenses, they are all sharp, contrasty, flat and easy to mount.

Also know as: RAYNOX DIGITAL CAMERA MACROSCOPIC LENS 2X, 35mm Microscopic Lens 6x model CM-3500, Raynox video microscope lens 35x, +5.9 diopter

Objective: Mitutoyo 5x M Plan APOCamera: Sony α6300, model ILCE-6300, also known as the A6300Sensor size: 23.5 × 15.6 mm. APS-C. 28.21 mm diagonal. 3.92 micron sensor pitchFlash: two Godox TT350s wireless flash units, one Godox X1s 2.4G wireless flash transmitterVertical stand: Nikon MM-11 with a Nikon focus block

Average Mitutoyo MT-1 Tube lens - 6.5Nikkor 200mm f/4 Ai - 6Nikon MXA20696 Tube Lens - 5.5Asahi  Pentax Tele-Takumar 200mm f/5.6 - 5Carl Zeiss Tele-Tessar T* 200mm f/3.5 - 5

TTL200

Lens performs better with 50-110mm extension from tube lens to objective, minimal extension resulted in slightly more CAs.

This 30 cm parabolic reflector is precision polished and made from 0.04" thick aluminum. It has a 0.75" center hole and mounting rim.

This lens was tested in 7 different configurations, some of these, especially with shorter extension were excellent. Examples of the other set-ups is available here on Closeuphotography.com:

Mounting: Thanks to 43mm x 0.5 and 49mm x 0.5 threads this lens is easy to install once you purchase the necessary step-down adapters.Test Notes:

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Short focus, or using a lens with less extension than is needed for infinity focus means that it is "focused" beyond infinity. This would create an unusable blurry image, but in many cases this happens to work well with tube lenses - as described here. Short focus results in shorter "effective focal length" used here for magnification calculation purposes, so for example the ITL200 with short focus is a 173mm effective FL lens, this would give you 0.865 x Mitutoyo objectives marked magnification, for the Mitutoyo 5x M Plan lens this would be 4.32x.

Mounting: Very easy to install an objective on the lens but its just about impossible to get the lens installed in some kind of rigid mount since this lens does not have a tripod collar.Test Notes:

Mounting: Very easy with 52mm x 0.75 threads. Reverse mount with threaded section towards the objective. See the LSA page for more details.Test Notes:

The NiSi Linear Polarizer Filter helps to reduce reflections and glare by filtering out the light on non-metallic surfaces. This light is often seen as a haze ...

Mounting: The ITL200 comes with 38 x 0.5 threads but the lens couldn't be easier to install with the optional Thorlabs tube lens adapter equipped with 52 x 0.75 threads. Reverse mount with threaded section or the larger end towards the sensor. See the ITL200 webpage for more details.Test Notes:

Edmund Optics Inc. - Edmund Optics, provider of optical components, introduces two new liquid-filled lenses from Optotune of Switzerland - the Electrically ...

All of these lenses are just excellent, clean sharp and super CA control. The big surprise here was the performance with the pushed down ITL200 and Raynox.

Also know as: DCR-150, Macroscopic Lens Model M-150, Model CM-2000 1.5X, +4.8 diopterwww.closeuphotography.com/raynox-tube-lens

Mounting: About impossible to get the lens installed in some kind of rigid mount since this lens does not have a tripod collar.Test Notes:

This lens was tested in 9 different configurations, some of these, especially those with shorter extension, were excellent. Examples of the other set-ups is available here on Closeuphotography.com: Closeuphotography.com/raynox-tube-lens

The Century +4, Sigma LSA, and Thorlabs ITL200 lenses all performed very well with short focus, that is, pushed down with less extension that is needed for infinity focus. Short focus, or using a lens with less extension than is needed for infinity focus means that it is "focused" beyond infinity. This would create an unusable blurry image, but in many cases this happens to work well with tube lenses - as described here. Short focus results in shorter "effective focal length" used here for magnification calculation purposes. Compared to a down-sized normal focus image, the pushed down/short focus image is sharper, clean and more detailed.

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Right click, or two-finger press any image, and select Save Image As.. Save and repeat. Compare images with an image viewer of your choice. I use Photo Mechanic: http://www.camerabits.com/

Short focus, or using a lens with less extension than is needed for infinity focus means that it is "focused" beyond infinity. This would create an unusable blurry image, but in many cases this happens to work well with tube lenses - as described here. Short focus results in shorter "effective focal length" used here for magnification calculation purposes, so for example the Raynox +4.8, 208mm lens, with short focus is a 178mm effective FL lens, this would give you .859 x the Mitutoyo objectives marked magnification, for the Mitutoyo 5x M Plan lens this would be 4.29x.

The Sigma 150 images are so sharp that the crops look over-sharpened but in fact they were processed identically to every lens in this test using actions and batch conversions.

Mounting: This lens uses common 58mm x 0.5 threads front and rear so it's easy to install with easy to find 58mm x 0.5 step-down adapters.Test Notes:

Its hard to believe that Nikons sells the MXA20696 as the current recommended tube lens when its is not nearly as good of a performer as Thorlabs ITL200, that is also made by Nikon. So Thorlabs Nikon made ITL200 is much better than Nikon's own tube lens? I have a feeling that the ITL200 is a lens a replacement part used in Nikon's microscopes and is not meant for outside sales.