jackm1943, the AmScope microscope objectives are well respected and they are a real price point bargain.
The illustration on the link you provided is misleading in that this microscope objective is a "finite" objective that requires being mounted 160mm from the "tip" of the objective to the sensor plane of the camera. It does not mount directly to the camera as shown in the picture.
According to the picture of the link, this 10X objective has an "NA" (numerical aperture) of 0.25 which equates to a depth of field of 0.0087 mm (8.7 microns). IF...I had a hair on my head, it would be between 30 to 50 microns to put this in perspective.
I have this AmScope 10X objective along with the 4X which has a NA 0.10 which has a depth of field of 0.055 (55-microns). They are both achromatic and they make good focus stacking lenses and I've used them on both DSLR and mirrorless cameras. If you are using a DSLR, I strongly recommend that you tether your camera to a PC so that you can watch the areas of focus in the live view. Digicam is a free program that allow you to control all of the aspects of your camera via a PC and it is what I used when I focus stacked with the Nikon D810. It also works with Canon and it is truly, "the cat's meow". Here's the link...did I mention that it is FREE..!!
http://digicamcontrol.com/downloadNow...here's something to think about. I know that you have seen pictures of people using a microscope before and perhaps you have used one yourself. Well...think about how close the tip of the microscope objective is to the glass slide being looked at. It's pretty darn close and so will it be when mounted on your camera for the camera will for all purposes be the 'microscope'. There is nothing wrong with this for the movement of the camera toward the subject will be measured in microns, even when taking hundreds of images in the stack it will appear that the camera is not moving forward at all.
Where the magic comes to play is getting diffused light on the subject that is so close to the tip of the microscope objective. I've attached a picture of how I use my AmScope microscope objectives for microphotography. I use translucent plastic drink cups, ping-pong balls, and vellum tracing paper in addition to just about anything that will diffuse light in my pursuit of diffused lighting. - Enjoy the adventure, Sippy
jackm1943, the AmScope microscope objectives are w... (