docmaas

docmaas

Lives in United States Fort Bragg, CA, United States
Works as a retired
Joined on May 10, 2001
About me:

sony nex, sigma dp2M, various lenses

docmaas' recent activity

  • With the DP2M you need to use spp 5.5.  spp 6 is for the DP2Q. Mike
  • Probably will not work with the 12-24 on SD1 because of the focal plane register. Also the Sigma image looks like it is shift only. A better solution is to buy a canon 17mm ts-e and either convert ...
  • I use this.  The side part blocks the sd card slot but I'm sure it can be safely removed and will probably do so when I return home.  I doubt a custom bracked will be available unless some sigma ...
  • Probably will not work with the 12-24 on SD1 because of the focal plane register.  Also the Sigma image looks like it is shift only. A better solution is to buy a canon 17mm ts-e and either convert ...
  • Replied in Thanks Kendall
    I do kind of like how it turned out too. Mike
  • I bought an RRS universal small L bracket years ago that has been on all of my Sigma cameras over the years.  It is currently on the quattro but gets moved to the SD1, DP2M and the Sony A7r.  It's ...
  • Yes I have a pano head consisting of an acratech head with a rotating base mounted upside down to serve as the horizontal rotator. On that is a sunway rail dmc-200L with a Hibu BWG M1 as the ...
  • Turn on the camera and change the focus to manual without touching the shutter button to cause it to af.  I think that is the same in the Merrill. Mike
  • Created discussions Quattro in Seattle at night
    First a pano of Seattle downtown. Shot at iso 125 f5.6 10 sec manual focus to infinity.  A little splotching here and there but overall not too bad.  Of particular interest is the difference in ...
  • A shot of my memory card on the mac when I got home tonight: Mike
  • Created discussions A few more from Seattle
    crop Quattro iso 125 f5.6 -- to get any lower I would have had to lay on my back crop quattro f5.6 Frank Gehry designed Paul Allen built EMP building crop quattro f5.6 Frank Gehry designed Paul ...
  • These are the goto guys in the professional area.  Most of these conversion lenses were designed for much smaller sensors but now that sony is offering both full frame and aps-c videocameras maybe ...
  • I seem to be addicted to accutance.  Bokeh is ok if it is intentional but I really like as much of an image to be in focus as possible for the most part. Just checked the 6db reference and it ...
  • I wasn't sure where to set sharpening for the Quattro so I left it at zero.  In this kind of test it doesn't really matter as the test is between apertures on the same lens.  In a multi lens test ...
  • You can check the mtf on these charts yourself if you are interested. Measure the highest amplitude wave on the far left divide by 2 and find the location on the right where the amplitude matches ...
  • There's more than one way to skin cat.:-)  Did you read the cited Koren article? But you make a good point without really making it at all.  My mtf is roughly at the center and the center only, but ...
  • Created discussions Quattro MTF Charts
    Disclaimer: These are relative MTF charts that show only the performance of this lens under the same conditions at different apertures. 50% MTF occurs where the contrast as determined by the ...
  • Both of these are highly respected converters. The Olympus has been used on lots of cameras including the M43s but the image circle is already too small on the M43 and would be even worse on the ...
  • Replied in speedbooster?
    Alas, you are right.  Too far out of the box on that one:-(
  • Replied in speedbooster?
    Like I said it all depends on the focal plane register.  If the dp2q register is less than the sony e mount it will physically work.  From there one would have to design a way to keep it aligned ...
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Total messages 4775
Threads started 733
Last post 1 day ago
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Total reviews 0
Entries 1
Votes cast 34
Last entry Sep 28, 2010
Photos uploaded 134
Last upload Dec 31, 2011