Compatibility of a Zeiss 20x objective

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andyman9277
Posts: 2
Joined: Tue Jul 27, 2021 11:27 pm

Compatibility of a Zeiss 20x objective

#1 Post by andyman9277 » Tue Jul 27, 2021 11:32 pm

Im wondering if anyone would know if this Zeiss ACHROSTIGMAT 20x objective:

https://www.ebay.com/itm/265183549477?m ... nl%3Dmkcid

is compatible with this Zeiss AXIOLAB microscope?:

https://imgur.com/a/MOxF4IZ

The objectives on my microscope say ACHROMAT, not ACHROSTIGMAT like in the eBay link. Appreciate the responses.

apochronaut
Posts: 6272
Joined: Fri May 15, 2015 12:15 am

Re: Compatibility of a Zeiss 20x objective

#2 Post by apochronaut » Wed Jul 28, 2021 12:20 pm

Achrostigmats were similar to CP Achromats( clinical plan achromats). They are not as flat over as wide a field as plan achromats, something similar to Neoplan or semi-plan objectives.
They were a briefly sold budget line that Zeiss sold back in the early days of their entry into an infinity optical system.
They would not be as good an objective as what you already have.

andyman9277
Posts: 2
Joined: Tue Jul 27, 2021 11:27 pm

Re: Compatibility of a Zeiss 20x objective

#3 Post by andyman9277 » Thu Jul 29, 2021 12:44 am

Thanks for the response! But do you think it would fit?

apochronaut
Posts: 6272
Joined: Fri May 15, 2015 12:15 am

Re: Compatibility of a Zeiss 20x objective

#4 Post by apochronaut » Thu Jul 29, 2021 1:44 am

As long as the threads are good. It is R.M.S. and infinity corrected for the German made Zeiss system ( 165.4mm reference length). I can't comment about parfocality but since it is a 20X , it has a slightly longer w.d. than a high dry or oil immersion objective, so would not be too far off. Sometmes one has to focus down a bit ftom a 20X.

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