Quoting Mark C <[email protected]>:
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...
Thanks for the report. I had no idea that these extension tubes
existed. The fact that they retain AF makes them doubly interesting.
Opteka comes up with some useful items from time to time.
--
Cheers
Brian
++++++++++++++++++++++++++++++++++
Brian Walters
Western Sydney Australia
http://lyons-ryan.org/southernlight/
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