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Re: [OM] Tamron 90mm 2.5 lens

Subject: Re: [OM] Tamron 90mm 2.5 lens
From: "Terry and Tracey" <foxcroft@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 21 Jan 2000 19:34:11 +1100
> Can any Olympians on the list help with information on the Tamron 90mm 2.5
> macro adaptall 2 lens (early version with 49mm filter thread) I want to
use
> it at 1:1.

I have this lens. I use it as much as all my other lenses put together.

> 1/Does the 2x flat field converter use a lens in its  construction?

Yes

> 2/Would I get just as good a result with a 45mm extension tube?

Probably better.

> 3/Am I correct in assuming 45mm extension added to the 45mm rack of  the
> lens will give me 1:1?

Yes. I put my 25mm tube on the 90mm often. And nowadays also screw in a IS
series diopter sometimes too.

> 4/What about using a Vivitar 2x converter to get 1:1?

What about the quality with more glass in the light path?

Foxy




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