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"widefield" EPs for Microscopes good?

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#1 cpsTN

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Posted 27 May 2013 - 09:56 PM

On Surplus Shed, I am finding standard 23mm EPs in both standard field (no field stated) and wide field (WF) types in both 15x and 20x powers. I want one of each of these mags to go with my 23mm 10x. Is there an advantage to wide-field EPs in Microscopy or it is only personal preference? The prices I am finding on Surplus Shed are $7 to $20 or so.

#2 Hikari

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Posted 27 May 2013 - 10:28 PM

I would simply get a wide-field 10x. Changing objectives is better than changing EPs. With the EP, you are simply magnifying the image with no change in NA.

#3 cpsTN

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Posted 28 May 2013 - 04:50 AM

OK. Are the objectives "standard". Also, I have a 10x already.

#4 Hikari

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Posted 28 May 2013 - 12:43 PM

Objectives are "standard" in that their field of view should not change. The only thing to think about with objectives is their NA, whether they are Plan, Fluor, or APO, and the working distance is sometimes important. For the most part, the 10X objective is usually in the sweet spot. Only very high or low magnifications does the design of the objective become tricky. I have never used a 10X I did not like.

#5 KennyJ

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Posted 28 May 2013 - 12:56 PM

Thanks for that, Hikari.

I realised there must be a logical explanation, but just wondered what it was.

Obviously, with binoculars and spotting scopes things are different.

There are those who, like myself, appreciate low magnification/ wide true fields of view, and there are those who give me the impression anything less than 20x magnification simply doesn't float their boat at all!

Kenny






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