Hi, I would like to get some experienced user opinions on whether my D90 has back focusing issues. BACKSTORY I got my D90 in Oct 2009 (first DSLR) and picked up a fair amount of knowledge in that short time IMO. I understand DoF concepts (where aperture, focal length, and subject distance affect DoF) and also having a fast enough shutter speed to avoid motion blur. I wanted to be able to shoot indoors in lower lighting conditions, so I picked up a Tamron 17-50mm f/2.8 Di II (non-VC model). Shooting people wide open (f2.8) I wasn't able to get very many shots in focus. It seemed to be focusing a little behind the subject, so I'd have their hair on the side of the head in focus with the eyes blurred. I even used single point focus and focused on the eyes without recomposing to eliminate the possibility of the plane of focus being shifted. I read about people having front/back focus issues with the Tamron 17-50, so I ended up returning it because of that and the 2/3 of a stop didn't really let in that much more light. I ended up getting a Nikon 35mm f/1.8G AF-S DX and discovered I was having the exact same back focus issues AGAIN while shooting wide open. I tried stopping down to 2.8 with no luck. Only when stopped down to about 3.5-5.6 was I able to get the subject's eyes in focus. My problem shots were even in the 1/60-1/80s shutter speed range for relatively still subjects (people). This led me to believe that it's not the two lenses with the back focus problem, but the D90 itself. I realize that each lens may not be perfectly calibrated with +/- variances (Ref: http://www.lensrentals.com/news/2008.12.22/this-lens-is-soft-and-other-myths). In comparing my printed photos with my relative's D40 with the 18-55mm f/3.5-5.6 kit lens and his photos were MUCH sharper around the edges of people and eyes compared to mine. TEST CHART SHOTS I printed out a focus chart (from here) and ran the test on the 35mm and 18-200mm lenses. Of course with the latter I can't get as shallow DoF. I mounted my camera on a tripod and set a 2sec countdown with the shutter delay on and flash fired. I tried my best to eyeball a 45 degree angle down towards the paper on the floor. I even did some shots hand held at varying angles and in those cases, I still had back focus problems. All shot with AF single point center, focused on the letter "h" in "Focus here"). Nikon AF-S 35mm F1.8G DX 35mm f/1.8, 1/80s, flash, tripod, Aperture Priority http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4311.jpg 35mm f/2.5, 1/80s, flash, tripod, Manual Mode http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4319.jpg 35mm f/3.5, 1/80s, flash, tripod, Manual Mode http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4322.jpg 35mm f/1.8, 1/80s, flash, handheld, Aperture Priority http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4342.jpg Nikon 18-200mm f/3.5-5.6G IF-ED AF-S VR DX 18mm f/3.5 1/30s flash, tripod, Aperture Priority http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4312.jpg 18mm f/3.5 1/30s flash, handheld, Aperture Priority http://i265.photobucket.com/albums/ii240/dialeleven/D90%20test%20chart/DSC_4333.jpg From the samples, do you think the D90 has back focus issues and should be sent into Nikon for calibration? P.S. I bounced back from Aperture Priority to Manual to see if I could get the 35mm shots brighter.