We, AmScope, provide all warranty services. Mounting Size on Microscope Side: 23.2mm, 30mm and 30.5mm. Microscope Adapters Included: two adapters converting 23.2mm to 30mm and 30.5mm. Magnification Power: 2X.
Great Microscope DSLR Adapter, with only minor drawbacks
Pros:
-the Nikon adapter (I have a D3400 and it fits very snugly) locks tight; take note of the raised metal pin on your respective camera body
- lens body is well machined, has a smooth finish making insertion/removal from a mount easy
- lens optics are fairly well made; one Amazon reviewer claims to have seen chromatic aberrations in their photos or videos through the optics, but I haven't seen those issues. It is easy to get out-of-focus photos with any camera, so make sure if part of your seen image is out of focus, that your microscope is level relative to the object, and the camera is level relative to the microscope.
Cons:
- it is designed to be used with a microscope, however this lens will magnify beyond what you see through the eye relief. It will crop half or more of the image out, so make sure whatever you are trying to photograph is zoomed out as much as possible. Or, alternatively, you can take multiple photos of the subject and in postprocessing crop them together. But, to make this clear, this adapter will "zoom in" more than what is seen in the eye relief by about two-fold; useful for a microscope, not for larger objects (anything 1" in diameter or more)
Protip: Make sure, if you want to have the eye relief in-focus concurrently with the camera adapter (so you don't have to adjust the microscope's coarse focus anytime you switch between the two), to adjust the height of adapter up or down (and for extra-tight focusing, use your camera's LiveView and digitally zoom-in to a spot on your subject, to maximize the effective focus).
Overall: Worth buying. Do not buy this adapter if you're trying to take photos of something large though.
I bought this to use with an Amscope trinocular dissecting scope and it works well. I didn't notice any chromatic aberration or other optical issues. Since I'm using a Pentax dSLR, I bought a t2-K mount adapter and it fit right up. If you have issues with your scope, you should be sure to adjust the camera up or down (my microscope has a metal ring for this) since the correct focal point for this seems to be different than the eyepiece. Once adjusted, both are in focus simultaneously with no issues.