![fokus test chart fokus test chart](http://regex.info/i/focus_chart_sm.jpg)
Try another lens and see if you get the same results. You can easily tell if the lens/camera is front or back focusing when you view the picture on your viewfinder magnified somewhat.īy the way, it looks like your camera/lens is front focusing based on the very small jpg photo you posted. I set the lens on maximum aperture, select single shot and center focus square then carefully focus on the label of the center beer bottle and snap a pic. I position the beer bottles exactly 12 inches on center and in a line that is at an angle to the camera's line of sight (so some beer bottles are closer than others to the camera). For a 50mm lens it would be maybe 15-20 feet for me. I put my camera on a tripod with MLU and shutter release and position the camera at a distance most likely to use in real life. What I do is set up some beer bottles (with labels attached) on a rail (or table, etc.) outdoors in good light. Primarily because (I believe) the photos are taken at a closer distance than the lens is normally used at. Mweddle, I've had mixed results with the test chart you're using. for some of us, it's imperative to be able to shoot wide open and not worry about focus issues.Īlan321 - so what would be a good test image to take? Would one of those test charts not do? I also need to test for front or back focus - but how is one to determine if it is the camera or the lens(es)? Thanks! That's why Canon recommend that you focus on targets that are flat and square-on to the camera, and also have an angled and graduated scale off to the side for measuring any front or back focus.Īnother flaw is that the AF can be out by different amounts at different focus distances but this chart is generally used at or near the minimum focus distance only. It would be far better if it just presented a single edge at a single distance so that the AF sensor could not get confused at all. The camera may pick one over the other or it may get confused and pick neither. That focus chart is inherently flawed because it presents two distinct edges at different distances. I still make lots of rookie mistakes, but at least i know they're my mistakes and not the camera. Eventually i sent it back to canon with a couple of pictures, and when it returned it was vastly improved. My 350D front focussed when i got it, and i thought for a while it was me expecting too much of the autofocus system. Those seem to be the only thing I'm good at.ĭon't chalk all of it up to rookie mistakes. Most of this stuff I can chalk up to rookie mistakes. Many times, that's a desired effect, but ot sounds like it's not what you're trying to do - try something else, i.e. Simply put, at f/1.4 the depth of field is just too narrow to get very much in focus.
#Fokus test chart iso
If it's too dark to shoot with a smaller aperture and still use a suitable shutter speed, increase the ISO setting, from 100 to 400, and so forth. Higher f-number (smaller aperture) = greater depth of field. If you want/need more than just someone's nose to be on focus, you need to use a smaller aperture. Oh, and dvarnav, I wish I had a MkIII to play with but, sadly, I don't.
![fokus test chart fokus test chart](http://blog.dojoklo.com/wp-content/uploads/2009/11/1357920792272-focus_test_chart.jpg)
Come to think of it, Sometimes her hir above her ears is in focus, so maybe I can chalk it up to her never stopping and me taking pictures for a total of 4 months now. How accurate is the focus on an XT? I have plenty of pictures of my daughters nose in focus but nothing else. Maybe I'm taking the wrong approach to it. I used their focus charts to test my 17-35/16-35 lenses and other eqpt. The best and by far more accurate way is the TFT (but I need a better way as this is TFT dependended) as described on that AF microadjustment proccedure
![fokus test chart fokus test chart](http://regex.info/i/JEF_024811.jpg)
I have tested a lot of lens with MarkIII with this type of procedure but the results was far from the accuracy needed for adjusting that type of camera. In some circumstances the shooting at 1.4 does fine if you can get an accurate focus.įirst of all this sheet of autofocus test is completely wrong idea for Mark III as this camera has more accurate system than the system that was this sheet designed for. Not only that, its pretty hard to tell anything from a 640x480 jpg for web.Ĭan't tell from you small photo. Sorry.Īnd, yes the 50 1.4 will be noticeably softer at f/1.4, you should see a pretty good improvement by f/2, and max sharpness at ~f/4 and above. First, how narrow do you think the DOF is with a 50 f/1.4 (and how accurate do you think the AF is on an XT)? Second, what happens when you take actual photos of things that aren't test charts? I cringe every time I see that test chart setup. Also, since apparently the 50mm is soft at 1.4, would another aperature be better?
![fokus test chart fokus test chart](https://qualitysafety.bmj.com/content/qhc/24/1/65/F1.large.jpg)
I shot it at 1.4 and it seems a little off. I tested my 50mm 1.4 lens today using the focus test chart on.