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[OM] Re: Auto Tubes

Subject: [OM] Re: Auto Tubes
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
Date: Wed, 17 Nov 2004 13:11:40 -0500
While the Oly auto-tubes are great, and build quality is better than others 
I've seen (OEM or otherwise), their lengths are geared primarily for 50mm 
focal length.  I've also used them with the 85/2.

I not only have a set of the OM tubes, I also have a set of longer ones 
(Vivitar ??), also metal and also auto-tubes . . . although finish isn't 
quite as nice as the OM's, and IIRC the flanges are aluminum.  In use, they 
work just as well.  The shortest in the second set is 12mm and the longest 
is 36mm.  I've found them *very* useful for focal lengths of 100mm to 
200mm.  I DO NOT recommend stacking more than three tubes, most especially 
with longer lenses (with which one might need a fair amount of 
extension).  The static torque load on the multiple lens/tube/body matings 
from a larger lens greatly extended starts to get a bit excessive.

I am not suggesting that one set would displace or be an alternative to the 
other . . . that's why I have both . . . I mention this to suggest also 
eventually getting a set of the longer ones . . . gives an enormous amount 
of flexibility with focal length, standoff from subject and total lens 
extension.  I recommend first getting the OM's . . . they're what I reach 
for first most of the time.

-- John Lind


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