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Re: [OM] Long Focus vs. Mirror Lens

Subject: Re: [OM] Long Focus vs. Mirror Lens
From: "M. Lloyd" <royer007@xxxxxxxxx>
Date: Thu, 31 Jan 2002 12:27:47 -0800 (PST)
A mirror lens is usually cheaper, easier to focus,
always a lot lighter (allowing it to be handheld) and
easier to construct so it might be sharper (big might
there though).

Cons are that it almost always has a fixed apeture
(usually at f8 or so). Might not have a tripod mount
so its tougher on the camera when mounted on a tripod.
The biggest drawback though is that it'll always have
doughnut out of focus highlights which can look simply
horrible so it has bad bokeh.

A glass lens at that length is usually very
substantial meaning its a tripod or bust, however
there are advantages. Variable apeture which is almost
always faster. Much better out of focus highlights.
This comes with a big weight/expense penalty though.
If you buy a long faster telephoto the price
skyrockets.

Basically if you are just rarely going to use a long
tele like that a cheaper mirror lens will probably
suffice. If you are going to be using long lenses a
lot though a glass lens would be a better match.

Mark Lloyd

--- Charles Monroe <chasmnro@xxxxxxxxxxx> wrote:
>    What are the pros and cons of a long focus versus
> a mirror lens of
> the same effective mm length?
> 
> Charles Monroe


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