Originally posted by txshooter Thanks guys. I have couple examples of MF primes. They are great no doubt. And a very valid point about SR in body, vs those inexpensive primes without IS or VR.
And note - the only stabilized Canon and Nikon primes are telephotos, and as far as I know, the only one under $1000 is the Nikon 105 micro.
Quote: I've just been frustrated at what I feel is loss of some good shots due to having to focus manually in lower light situations or for specific shots where I want the sharpness of these primes over the kit lens. Also, with the K100D I've had shots that the view finder has led me to believe are in focus and the result is an out of focus shot. Frustrating. Maybe it's just me needing more practice with these lenses.
Practice does help. So do other focusing aids, such as the O-ME53 viewfinder magnifier or a split prism focus screen. And do be sure to check your diopter adjustment periodically to make sure neither it, nor your eyes, have changed recently.
But the main thing is practice, and in particular, realizing that at large apertures with shallow DOF, the viewfinder *does* lie. It shows too much in focus. Meaning it *will* be the case that some things will look in focus but turn out not to be, and this is unfortunately normal. Once you learn to anticipate and quantify this, though, you can improve markedly. I would recommend practicing on a sheet of paper with relatively small printing on it - a newspaper, CD booklet, etc. Lay it down flat, point your camera at it on an angle, try to focus on a line of text, make a mental note of how many lines above and below the chosen line *also* look in focus, then snap the picture. For apertures larger than f/2.8, you will find *fewer* lines in focus in the picture than the viewfinder. Learn *how* the focus zone constricts - on my camera, it changes such that objects toward the front of the apparently-in-focus zone stay in focus, but objects to the rear do not.
So focusing for me changes from just just trying to get the subject in focus to trying to place it at the front of the apparently-in-focus zone. That's the part that takes practice, but it can be done. Learn to actually see the whole focus zone forward and backward as you turn the focus ring, and stop when it sits so that your subject is at the front edge. At least, that's how it works on my camera. Yours might differ slightly in the position of the focus screen, so that's why you practice first on printed material, where you can easily see the effect.
Anyhow, I think it's worth it, because there are so many good and relatively MF lenses out there, it would be a shame to not to be able to use them. Also, it's not like AF is a panacea at large apertures either - with the shallow DOF even the slightest BF/FF discrepancy can lead to errors, as can the fact that you can't really control exactly where the camera focuses. For example, in a portrait, you might want focus on the eye and not the nose, but try telling an AF system that. Unless it's a very tight shot tha puts the nose and eye far enough apart in the viewfinder, chances are both the eye and nose will be range of the same AF sensor, so it will be difficult if not impossible to force the camera to focus on the eye. And again with the shallow DOF you get at large apertures, that could the difference between success and failure. So good MF skills are important even with AF lenses, I find.