Adding an brightfield objective..20x or 25x?

[Scoper]

I am considering adding an additional objective to my assortment for observing pond life..either 20x or 25x.

Which would you recommend and why?

Thanks

[charlie g]

Either 20X, or 25X work for me...often you need more than 2X,m 4X, 10X with protists and meiofauna. charlie g

[Alexander]

Doesn't matter, just take what is available for your scope.

[apochronaut]

Your add on objective has to work in your system : have corrections that are equivalent to other objectives in your existing system, so I can't think of an instance where a company made both in the same optical family. You will have the choice of one or the other.

[deBult]

Your add on objective has to work in your system : have corrections that are equivalent to other objectives in your existing system, so I can't think of an instance where a company made both in the same optical family. You will have the choice of one or the other.

Meaning: you require an objective of the same brand and same era as the rest of your scope.

My Olympus 20* is by far my most used objective for pond dipping, and indeed 20 or 25* both are OK.