The 7 element Vivitar has a much better reputation than the 4 element.
with teleconvertors the 7 element convertors are generally better. The
extra elements allow for better correction of various aberrations.
Jim Couch
William Clark wrote:
>
>
> Hey all,
>
> I just noticed that my 2 Vivitar MC teleconverters are a bit
> different. I have the Macro-focusing one (7 elements in 5 groups) and
> a non-macro one with 4 elements in 4 groups (both teleconverters are
> 2X). Which one is better? I am not sure what an extra group and more
> elements give you. Would the extra group impede light transfer in
> astrophotography? Thanks for any help....
>
> -Bill
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