I've tried the Q7 some more for stacks now, and noise doesn't seem to be
a problem at ISO 100. That's one of the pros.
Another pro is what I observed to begin with, that at the extreme end of
magnification, certainly at 10X, the low vibration and high pixel
density makes it possible to produce very detailed images. With the
extreme crop, however, it also means that one needs several stacks to
cover the surface of even a small subject, and then mount them like a
mosaic to a complete picture afterwards. Lots of work, but it's nice to
know that a method is workable for those smallest of critters when
vibration becomes a showstopper with SLR-style cameras.
A big con is that whatever chromatic aberrations are present in the
optics are spread over more pixels when pixel density is higher.
For more conventional macro stuff, I can only speculate yet. I suspect
there is a sweet spot in the tradeoffs between magnification, DOF and
focus range that justifies its use.
Jostein
Den 08.06.2017 21.55, skrev Mark C:
With the demise of my original series Q I ordered a Q7, so I might try
some macro work with it. The original Q was good for single shot macros
but not for focus stacks - too much noise compounding in the stack.
Since a 1x lifesized shot on the Q is more like a 5x shot on APS its
much easier to fill the frame with something small.
I was tempted to abandon the Q system but my Q lenses would not fetch
much on the market and Q7's seem to be pretty affordable. And it is a
fun system.
Mark
On 6/4/2017 4:48 PM, Jostein wrote:
Quick conclusion, it's quite a capable little beast, at least at low ISO.
What I've tested so far is to hook it up to a macro slider, and do
extreme macro tests with microscope optics in front of it.
At any given magnification it naturally produces a much tighter crop,
but the amount of detail preserved per surface area of critter is a
lot better than in images produced with eg. the K-3 and the same
optics. The tightly packed pixels of the small sensor is a good thing
from this perspective.
Vibration issues are, as expected, virtually nonexistent.
Am optimistic about this now. :-)
Jostein
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