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Those values are the size of the front filter threads on the lens.  i.e. what is the size of screw-on filters that you'd need to work with the lens.

Cameralens diameter

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If the lens mount is compatible with the camera's lens mount, no adapter is needed.  You can mount any compatible lens regardless of its focal length short, medium or long because the mount is universal.  The mount on the body is a fixed size.  So is the flange on the back of the lens.

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For choosing a lens, you should be looking at the focal length of the lens, not the filter diameter. A lens such as a Canon EF-S 18-135mm f-3.5-5.6 IS USM is a good choice for a general-purpose use on the 90D camera. I have one for my 80D. The 18-135mm is the focal length range for a zoom type lens (variable focal length). A fixed focal length or prime lens only has one mm rating such as 50mm.

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I'm interested in purchasing a 90d DSLR, and have just noticed that in some of the listing pictures on various sites the lens mounted on the camera is a 58mm and in other listings it's a 67mm. I always thought the 90d took a 67mm lens; clearly I was wrong. However I also noticed that the listings with 58mm lenses are less expensive than cameras with 67mm. Could someone explain why the difference?

Fluorite or semi-apochromat objectives–These lenses are chromatically corrected for red and blue, and the green focus is also close. They are spherically corrected for blue and green. This objective is better suited for color viewing or recording than achromatic objectives.

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The threads on the front of the lens are strictly for screwing a filter onto the front of the lens, not for mounting the lens to the camera. The lens mounts via the other end of the lens with an EF or EF-S bayonet mount to the camera. As long as you use a Canon EF or EF-S lens, you can attach it to your EOS 90D camera. That is the only criteria for lens compatibility with your camera. No need to worry about the filter thread diameter until you purchase an optional lens filter.

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Lens diametersunglasses

Apochromatic objective–This is the most expensive objective. It is chromatically adjusted for four colors (deep blue, blue, green and red) and spherically corrected for deep blue, blue and sometimes green. This is the best choice for color viewing. These have a higher numerical aperture (N.A.) than achromats or fluorites.

Those values are the size of the front filter threads on the lens.  i.e. what is the size of screw-on filters that you'd need to work with the lens.

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Your 90D camera makes use of EF or EF-S mount lenses.   The entire set of those lenses will attach to your camera without the need of any adapter.

(In basic terms) The 50mm lens is 50mm long (fixed), and for example 52mm wide, you could install a 52mm filter on the front of it.  Its rear flange doesn't change.  This is what mounts the lens to the camera.  The 24-70 (zoom) might be able to mount on the same body, but its diameter is larger, example 82mm, so you would screw an 82mm filter onto the front of it.  Each camera type (or series) is based on a standard (mount type).  The focal length of the lens does not matter.  Different lenses come in different lengths and diameters, but the flange (or mount) on the back of the lens does not change.

A variety of microscope objectives are available. All objectives use lenses to focus light. Light is broken down into various wavelengths (colors) as it travels through a lens. The various wavelengths have different focal points. That means that red, green and blue appears to focus at different points. This is called chromatic aberration. Spherical aberrations are focal mismatches caused by the shape of the lens. Quality lenses are designed correct for chromatic and spherical aberration to bring the primary colors to a common focal point. These terms may help you determine the best objective for your application:

Cameralenssize chart

Plan objective–These objectives produces a flat image across the field of view. The three objectives discussed above all produce a curved image. A plan-achromat, plan-fluorite or plan-apochromat are corrected.

Thank you for the information. However, once again I’ve failed to make clear what I’m asking about. My question has nothing to do with a lens type. I’m strictly speaking about lens mounts…camera lens mount and lens mount. As I mentioned in the beginning of this thread, I was under the impression that a Canon 90D camera  has a 67mm wide lens mount. Since the size of the lens mount size is printed on the front of a lens, why am I seeing in various listings  lenses on 90Ds that are both 58mm and 67mm, as these pertain to the camera mount? Hence, my question about an adapter. Apologies for lack of proper nomenclature.

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Achromatic objectives–This objective brings red and blue light to a common focus, and is corrected for spherical aberrations for green. It is excellent for black and white viewing. If an objective is not labeled, it is achromatic.

Infinity Correction–When measuring from the back end of the objective to the primary focal plane, many microscopes are limited to a specific distance (160mm). More expensive microscope use a different series of lenses, prisms and mirrors to allow for an "infinite" distance between those two points. This is called infinity correction.

TIP: On the trinocular version of the PZMIII or PZMIV stereo microscope with the standard configuration (1.0X objective, 10X eyepieces) and with the optimal camera adaptor (0.5X on a ½” CCD camera) the video capture field of view is up to 40% less than the visual field. By using a 0.5X objective with 20X eyepieces the video capture area doubles, and the resulting video capture more closely matches the visual field of view.

Your camera can work with any EF or EF-S lens.  The actual filter size across that wide range of lenses will be amongst many different values.

The first image shows the eyepiece view when using a 1.0X objective with a 10X eyepiece. It has a 34mm field of view. The second image shows the video field of view of about 16–4.7mm (COLCAM-NTSC camera with a 0.5X coupler). The third image shows the video view that approximates the eyepiece view. It uses a 0.5X objective with a 20X eyepiece.

Lens diameterglasses

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You are not understanding the specifications for the lenses. The size printed on the front of the lens is not the lens mount size, it is the diameter of the filter threads. You are confusing the two.

All you need to know if it is compatible with your camera is the lens mount type, either an EF or EF-S type. If your selected lens has either of these two mounts, it will fit and no adaptor is needed.

Problem: The PZMIII or PZMIV stereo zoom microscope normally comes with a 1.0X objective and a 10X pair of eyepieces. The magnification is 6X to 50X, however the concept of magnification is difficult to visualize. Let's discuss what can be seen at the two zoom extremes. Imagine the visual circle to be a range of 34–4.2 mm. This microscope has a working distance of 100mm. Researchers working with small animals will have difficulty working in this tight space.

Thanks, Ricky, for responding.  I am aware that the mm values I spoke of are in relation to the threads. I apologize for not being more clear with my question, as I wasn't asking about the lens size (focal point), but specifically about threads. If I may, let me rephrase: If the native lens size of a 90D is 67mm, is an adapter being used to fit a 58mm lens onto the camera?

Lens diametereye

Your camera can work with any EF or EF-S lens.  The actual filter size across that wide range of lenses will be amongst many different values.

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The diameter of the lens determines the size of the filter you screw to the front.  Lenses can come in prime (fixed focal lengths) example 50mm or a zoom example 24-70mm.

The magnification of the image depends on the combination of the eyepiece and the objective used. This combination also affects the field of view. This example shows how these factors inter-relate.

NOTE: If a 1/3” inch camera (6mm diagonal) is used on the 0.5X microscope adaptor you can apply the ratio of 6/8 for the reduction in the captured field.

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Solution: Instead of the standard configuration, setup the microscope with a 0.5X objective to increase the working distance to 187 mm. The result of using this lower power objective is that the magnification range decreases by one half and at the same time the field of view double. To restore the microscope system to the original condition (magnification and field of view), replace the 10X eyepieces with 20X eyepieces. The use of these two options restores the visual field of view and magnification range back to the original condition with the added benefit of a larger working distance.

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