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Author Topic: The "What did you buy today (or recently)?" Thread Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 03-10-2010 12:57 PM                        Today I got a brand new Canon EOS 7D DSLR camera! Yay me! Yes, I had gotten another one last week, but you can never have too many! Actually the first one had a dead pixel in the sensor near the bottom right of the image. This, of course, was completely unacceptable. So I exchanged it. Canon also started a rebate thingy 3 days ago, so the store put $107 (rebate plus tax) back onto my card, so I am kind of glad I had to exchange it! I had to do this with my old Canon Rebel T1i as well. First camera had a dead pixel in the sensor. Back it went. I think Canon has a policy where you must always exchange their cameras because the first will always have a nice red dead pixel. What is interesting is that the dead pixel is removed if you shoot in RAW and open it with Photoshop CS4. You can see the dead pixel as Photoshop is opening the file and then suddenly it is GONE! That doesn't help for JPEG or video shooting, however. Oh and Julio, thanks for all of that info. We have a diffuser filter on the way.  |  IP: Logged Julio Roberto Jedi Master Film Handler Posts: 938 From: Madrid, Madrid, Spain Registered: Oct 2008 posted 03-10-2010 01:28 PM                    This one was a good match for the 5DMK2 for most circunstances. http://dark-stone.com/caprock/ Don't know about the 7D, though, but looks good: http://www.vimeo.com/7523222 It's not like a 100% solution, of course, but getting rid of some 70%+ of the moiré is a must for these cameras to do half-decent stuff. We lose a tiny bit of sharpness but these cameras are sharp enough plus the softer look helps conceal the video look. A fair tradeoff.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 03-11-2010 02:22 PM                        We got a $16 or so D2 diffuser and while it does look a bit better, my initial tests still show the rainbow moire in the rooftop shingles of my neighborhood at certain focal lengths (no more, no less). This was the only test I have done so far and it was very brief.  |  IP: Logged Julio Roberto Jedi Master Film Handler Posts: 938 From: Madrid, Madrid, Spain Registered: Oct 2008 posted 03-11-2010 02:56 PM                    Finding a good match in a filter that will difusse to a point on the pickup that is about the size of slightly under 3 lines (6 vertical pixels in the 5DMK2) is the fun part ... If it diffuses too little, you get little help getting rid of moiré. If it diffuses too much, you are "wasting" resolution. Oh well. It seems the Caprock 2.0 works well on the 7D. But it's about $100. Using small apertures and longer focal lengths also often help reduce the aliasing/moiré artifacts.  |  IP: Logged Bobby Henderson "Ask me about Trajan." Posts: 10973 From: Lawton, OK, USA Registered: Apr 2001 posted 03-11-2010 04:06 PM                     Don't you mean larger apertures and longer focal lengths? The smaller the f-stop number equates to a bigger aperture opening and increasingly narrow depth of field. F/2.8 on a medium to long telephoto zoom will blur away most of the background, especially at 200mm or longer. Canon's L-series 50mm and 85mm primes open up to a huge f/1.2 aperture. That makes for an extremely narrow depth of field. The narrow DOF look is arguably the primary reason why Canon DSLR cameras are getting any use by professional videographers. Most lens packages on semi-pro and professional quality video cameras don't have apertures large enough to achieve the artsy looking narrow DOF effect. You end up having to use a high end system or a motion picture film camera. It's just too bad Canon's video processing with this first generation of HD-capable DSLRs sucks in terms of moire prevention. Look for this to be THE angle Nikon uses in one-upping Canon in HD-SLR camera functions with newer cameras. Of course Canon will have to answer with moire-free HDSLR cameras of their own.  |  IP: Logged Robert Minichino Master Film Handler Posts: 350 From: Haskell, NJ, USA Registered: Dec 2005 posted 03-11-2010 05:28 PM                        At very small apertures your sharpness is limited by diffraction, which blurs everything. http://www.bobatkins.com/photography/technical/diffraction.html  |  IP: Logged Julio Roberto Jedi Master Film Handler Posts: 938 From: Madrid, Madrid, Spain Registered: Oct 2008 posted 03-11-2010 05:47 PM                    quote: Bobby Henderson Don't you mean larger apertures and longer focal lengths? No. In this case I did mean smaller apertures (aperture values of F16 and above) and longer focal lengths. Although the shallow depth of field of larger apertures may help conceal artifacts on objects with vertical lines crossing horizontal ones in some situations, mostly on objects in the background, I was talking about when you "must" have a subject "in focus" and relatively small focal lengths (i.e. you DO want to shoot Joe's neighbour tiles and they don't just happen to be in the background ) Then an aperture small enough (say F22) to introduce a bit of diffraction softening could remove it (may need to increase ISO or exposure, of course, which may lead to more noise or motion blur). Longer exposures often help with the moiré for obvious reasons, though, specially if you're not on a tripod Here are some examples I just googled: http://www.luminous-landscape.com/tutorials/understanding-series/u-diffraction.shtml Come to think about it, maybe Joe has a particularly bad combination with his lens and camera. Not that he is the only one or that the moiré problems are not common, which they are, just perhaps a tad worse in his case. He may want to try a back focus adjustment first if he is relying in AF. http://www.northlight-images.co.uk/article_pages/cameras/1ds3_af_micoadjustment.html Both, for maximun sharpness and slighty out-of-focus, in case one setting works better. Having the freedom to use interchangeable lenses is great but it also means you can't match the lens resolution/diffraction limit to the sensor optical block/lowpass filter. When paired with the right lenses, these cameras are great still performers. When paired with the right (probably different) lenses and diffuser filters, they are half-decent video performers with some situations when the aliasing/moiré artifacts are very hard to avoid. But a fixed lens (dedicated) video camera can easily avoid the problems that otherwise we have to deal with here.  |  IP: Logged Bobby Henderson "Ask me about Trajan." Posts: 10973 From: Lawton, OK, USA Registered: Apr 2001 posted 03-11-2010 06:47 PM                     Less expensive lenses will be more prone to issues like lens flare, fringing and chromatic abberation. I can certainly see how CA would dramatically worsen the moire issues in HD video shooting. Most of Canon's better quality lenses, particularly the L-series models, do much to reduce chromatic abberation. But it can still show up in very high contrast situations, like if you're shooting outdoors in bright sunlight early in the afternoon. I've seen that happen when over-exposing some shots using my 24-70 lens. Chromatic abberation is fairly easy to correct in RAW-based still images. Canon's Digital Photo Professional software and Adobe Camera RAW both have filters to reduce color fringing and CA. But those filters don't help you when the imagery is MP4-compressed HD video with a nasty dose of moire cooked into the image. If I remember right, Joe has the Canon EF-S 15-85mm f/3.5-5.6 IS USM zoom lens. It's not a L-series lens (and doesn't have a consistent aperture either), but the lens generally gets good reviews thanks to its three aspherical elements and ultra density element -features that usually come in a L-series model.  |  IP: Logged Steven J Hart Master Film Handler Posts: 282 From: WALES, ND, USA Registered: Mar 2004 posted 03-11-2010 08:01 PM                        Macbook Pro 13" for my Wife. This will replace her much hated Toshiba notebook. The new "unibody" design is pretty cool. Makes my older 15" Macbook Pro look kinda clunky. I purchased it from a seller on eBay who I've bought several macs from - used the "Bing.com" cash rebate and got about $120.00 off the price. I hope Wife likes this better than what she refers to as the "Crapshiba"  |  IP: Logged Manny Montes Master Film Handler Posts: 270 From: United States Registered: Feb 2010 posted 03-12-2010 12:27 AM                     Just bought some more dress shirts for work from express. About to order a custom suit from indochino, if anyone has any suits from them i'd love to hear how they are. I've read rave reviews online, but never seen one in person. I figured that hopefully I need to start looking nice if I'm ever going to get promoted They are pretty cheap though for a custom suit, I've been wearing walmart brand or similar the entire time i've been floor managing.  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 03-13-2010 02:47 AM                     Went on a binge: Photoshop Elements 8 Belkin 7 port USB2 hub HP 1tb SimpleSave external hard drive.  |  IP: Logged Alastair Comrie Film Handler Posts: 28 From: Auckland, New Zealand Registered: May 2007 posted 03-24-2010 05:47 PM                     My latest unnecessary but awesome purchase : 1996 Mitsubishi Lancer Evolution IV 280 BHP, 0 - 60 4.8sec  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 03-24-2010 07:13 PM                        Film-Tech needs a "Like" button!  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 03-25-2010 08:45 AM                        Just bought a new Guest Pager System for the drive-in. We bought the 20 pager system to help alleviate the long waiting lines in the lobby for people waiting for kitchen food. Since our place is all "cooked to order", now our patrons can take a pager, go back to their car and we'll BUZZZZZZZ them where their dinner is ready. Since people tend to bring EVERYONE in the car to the concessions building when ordering their food, this will help clear out the building quicker and let us serve the other customers more efficiently.  |  IP: Logged Damien Taylor Master Film Handler Posts: 493 From: Perth, Western Australia Registered: Apr 2007 posted 03-25-2010 09:29 AM                     quote: Barry Floyd Just bought a new Guest Pager System for the drive-in. We bought the 20 pager system to help alleviate the long waiting lines in the lobby for people waiting for kitchen food. Since our place is all "cooked to order", now our patrons can take a pager, go back to their car and we'll BUZZZZZZZ them where their dinner is ready. Since people tend to bring EVERYONE in the car to the concessions building when ordering their food, this will help clear out the building quicker and let us serve the other customers more efficiently. This is an amazing idea, and a great integration of new technology the old drive-ins probably wish existed. I wonder if other DIs have thought of this yet.  |  IP: Logged

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