Working distance for the normal prime even with the shortest tube is
pretty tight, and the magnification is pretty high. I have the "toy"
telephoto but that's not a patch on the tele zoom - I might try it for
fun but I doubt it would be very good. I think think the tele zoom will
be quite excellent with the shorter tubes, though.
Mark
On 8/14/2014 9:09 PM, Zos Xavius wrote:
Thanks for posting these. I wonder if the prime holds up any better.
On Thu, Aug 14, 2014 at 8:36 PM, Mark C <[email protected]> wrote:
I ordered a set of the Opteka tubes for the Q last week and they arrived
today.
First impressions: They work as advertised retaining full AF and aperture
control etc. They have full contacts so everything functions as you'd
expect. But - the AF gets somewhat unreliable at higher magnifications.
Build quality seems to be good.
The only issue I note is that 10, 16 and 21mm tubes are quite long for the
focal lengths and small sensor size. With the 10mm tube the 8.5mm is already
over 1:1 lifesized. Given the sensor size, lifesized = a subject frame with
a 6-7mm diagonal.
The shorter tubes seem to work very well on the 15-45 f2.8 tele zoom and it
retains usable AF as well. Some quick grab shots of a dime using the 10mm
and 16mm tube and that lens. These are uncropped frames and as close as I
could get to maximum magnification. Working room was about 8 inches from the
front of the lens for the first shot and about 5 inches for the 2nd. Flash
was done using a DIY diffuser on the built in flash (the design that Tione
shared some time ago.)
http://www.markcassino.com/b2evolution/index.php?blog=9
I hope to run this setup through its paces in the next week or so.
I also picked up a Case Logic DCB 304 for the Q kit for about $10. Finally
the right size bag - comfortably holds the Q, batteries, cards, 4 lenses,
tubes and other bits and bobs - just big enough but still dang small...
Mark
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