Since both lenses go 1:2 on their own they need 1/2 of their focal
length in additional extension to reach 1:1. For the 50mm that means
the 25mm tube. For the 90mm it means the 25+14+7mm tubes for a total of
45mm additional extension.
Chuck Norcutt
Wayne Culberson wrote:
> I think a 25mm extension tube will take the 50/3.5 to 1:1. I'm not sure how
> much extension is needed for the 90/2, but I would guess about 50mm of
> extension. A 25mm extension tube can be made from a basic 2x converter by
> removing the glass. They are practically free. Extension tubes produce light
> loss only.
> I have the Vivitar 55/2.8 which goes to 1:1 by itself, and the Vivitar
> 90/2.5 which goes to 1:1 with the matched extension adapter. Also, the
> vivitar 2x macro takes the normal 50/1.8 to 1:1.
> Wayne
>
> ----- Original Message -----
> From: "John Hudson" <OM4T@xxxxxxxxxxx>
> To: <olympus@xxxxxxxxxx>
> Sent: Saturday, July 16, 2005 9:14 PM
> Subject: [OM] adding to macro
>
>
>
>>This question may have been addressed in the recent past and if it has I
>
> apologise for raising it again.
>
>>As I understand it, both the 50/3.5 and 90/2 Zuiko lenses produce nothing
>
> larger than a 1 : 2 life size image on 35mm film.
>
>>Is there a ring or attachment for use with either lens that will increase
>
> the life size image on film to a 1 : 1 ratio?
>
>>If so, can anyone advise on the cost, specifications and availability of
>
> the required rings or attachments?
>
>>Also, is there any advice on the loss of definition experienced when
>
> adding the ring or attachment to either lens as compared to using them
> without?
>
>>Thanks
>>
>>John Hudson
>>Nova Scotia, Canada
>>
>>
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>
>
>
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