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Fitting an adapter on a microscope objective

Started 5 months ago | Questions thread
neilt3
neilt3 Veteran Member • Posts: 3,008
Re: You probably need an RMS adapter, not an M25

Joseph S Wisniewski wrote:

Welcome to the exciting world of "objective collecting". You've just run into one of the most common problems in the world: things "not quite" fitting together.

The TL;DR if you don't want to read one of my long posts is that you've probably got an older objective that uses the infamous "RMS" mount (affectionately known as the "royal screw" by us microscope nerds). It's been around forever and was was sort of the "universal mount" from like 1860 to 1960. An RMS objective has 20.32mm threads and will drop into a 25mm M25 mount without engaging.

The "long" explanation:

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SNIP------To keep the quote short-----------------

Thank you for a very informative post . I've bookmarked it , very helpful .

I've used microscope objectives before off an old microscope I have ( probably 1950's or 60's ) and have an adapter to either mount the camera on the microscope for using with the eyepiece in place , and an adapter to mount the RMS mount to my bellows or direct to a "T" mount on the camera .

I also have some Minolta and Olympus bellows lenses of the RMS mount type .

I'm looking at getting one or two more objectives of a better quality hence having a look on this forum to get a bit more information .

I was forgetting that RMS isn't necessarily the "standard" mount anymore .

Your post has given me more to make a more informed decision on as well .

Cheers .

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