Noise, Open?

hey Amulet man,
Nice work!
I found an older post on the 85b filter that Barry uses, you might find it of interest, also more on the 5600k noise issue with the dvx. This threads starts out on HVX, but as you read on you will see its dvx relationship!

http://www.dvxuser.com/V6/showthread.php?t=43550&highlight=fire+sale

check out the cost of that polarizing 85b!! wow!
I read, the tiffens dont cut it unless you buy the big money ones

here's the filter
http://www.bhphotovideo.com/bnh/con...lSearch=yes&O=RootPage.jsp&A=search&Q=*&bhs=t
 
Thanks for the link; I guess that makes sense that the 85b helps but only a bit...I wonder if B Press is also the cleanest gamma setting on the DVX. I bet it is. And, of course, that filter is out of my price range...I've been using cokin resin filters--super cheap but they scratch easily.

TheComo, I shot some more tests for you regarding wide open adding noise. You may be on to something, but I think it's just that when things are out of focus they appear grainier, as you can see in these test grabs (shot wide open; you can tell by the chromatic abberation). These are shot with the 100a so your 100b should look much cleaner, too! I'll upload them in a minute; you can see that the deep focus shots look a lot cleaner than the shallow focus ones.
 
4.png


Shot wide open..still looks pretty clean. Ignore the god awful composition, I just wanted to get the right colors into the shot to test noise levels.
 
Could just be jpeg compression, but that shot seems a TINY little bit out of focus. Try shooting that exact shot at a higher f/stop like in the 3-4 range. (i dont remember which ones the dvx has) and let us compare. I would like to see if the difference is perceivable on the DVX.
 
It's probably focus (I didn't focus these carefully at all...) but the cheap filters don't do the lens any favors. It may just be my dvx, but it's DEFINITELY sharper even at f3.4 than wide open...which makes 35mm adapters even more of a pain.
 
All lens systems have a sweet spot in the middle, where you get the most accurate, crisp aimeg. That goes for iris, zoom, and focus. To get an ideal image, you'd probably shoot F5.6, Z50, 50 focus. Circumstances will often dictate otherwise, and you may make trade-offs to get shallower depth of field that may result in slightly higher noise or other problems.

Wide open iris will get you a gunky (my word) image, closed iris will get you diffraction (mungy).

Wide zoom will get you barrel distortion, and possibly chromatic abberation. Full zoom will you get you chromatic abberation and lower overall detail.

Focus doesn't get much attention, but you'd have to assume that with everything, it fails somewhat when pushed to either extreme.

The iris sweet spot for the DVX is between F4-F8. Usually, I shoot at F2.8 and with a long lens, to get shallower depth of field, and I'm comfortable with the image I get.
 
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