Thanks for posting these. I wonder if the prime holds up any better. On Thu, Aug 14, 2014 at 8:36 PM, Mark C <pdml-m...@charter.net> 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 > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions.
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