Tuesday, December 1, 2009

50mm autofocus fail


320/365
320/365 by timcaynes
It has been a little while since I acquired my new Minolta 50mm lens for my Sony A300 and I'm steadfastly refusing to take any photos where the thing I was expecting to be in focus is in fact in focus. I'm am now quite adept at getting most of my nose quite sharp but since there is a significant surface area to work with there I'm not counting it as a result. The thing I'm really trying to grapple with is while I'm still locked in to my 365 project and consequently taking far too many photos of my own face every day just how do I get my new lens to focus on one of my eyes. Either one, I'm not bothered. Just focus, pin sharp, like I know you can. On that blue bit in the middle where I'm trying to look all angsty. Yes, there. No. That's my nose again. Grrr.

I am probably making the proverbial rod for my own primordial back being firmly clamped at f1.7 until I get this right, but then, that's not about focus is it, its just about depth of field. I could have a depth of field like f0.3 or something and still get one of my bloody (for they are, after about 10 hours of trying) eyes in focus notwithstanding the fact that at that aperture I'd probably get eyelash bokeh but that's not the point. The point is, I haven't mastered this lens yet. And I'm running out of time. Kind of. This year's 365 project concludes neatly on December 31st, after which I shall probably treat myself to the flickr equivalent of a 3-week Norwegian cruise, that is to say, I might not post anything for a day or so. Without my 365 project, I'll not nearly be so inclined to invest the hours it will apparently take to crack this self-portrait focus failure which would be troublesome as I rather like the lens. I guess I have 30 days to sort it out.

3 comments:

Nick said...

Problem is, if it were a photo of someone else, you can focus lock it (it'll be on the camera somewhere) and then move back or forwards to get your focal plane right, or, god forbid, manually focus it, I can never be bothered. because you can't see what you look like through it while it's pointing at you, you've got a problem. Unless you can either; shoot remote, using a computer to trigger it via some software or other from the screen, that might let you focus it, Canon does give it's DSLR users such a thing, it's a bit rubbish, maybe Sony do too. Second method is to try and get focus lock to work, or focus on a manual plane and then try and be there rather than an inch behind it when you hit the button.

The third way, is to put it on burst and then just rock backwards and forwards in front of it, I do that without the camera sometimes.

Tim Caynes said...

I use a remote and tend to focus lock and them move myself across the focus plane, but while I'm messing about at f1.7, that plane is pretty tight, if that's the expression, so moving an inch forward or back throws things out. I centre-weight the AF, because its the strongest on the Sony - using a different focus point is quite unreliable.

The main problem is due to it being self portraits. And that I also do that rocking thing. And my eyebrows get in the way.

Nick said...

I 'm with you on the eyebrows, mine stop me watching TV sometimes.