Airplanenut From United States of America, joined Sep 2001, 660 posts, RR: 1 Posted (8 years 10 months 3 weeks 5 days 20 hours ago) and read 5840 times:
While taking some shots today, I ran into a problem that I also had earlier in the week... on just some of the pictures, the quality completely dies, while other shots are sharp and really nice. Here's one example:
Also, there's a black speck in the middle of the shot... I can't tell why it's there, since I've seen it with two lenses, and I thought I wiped the camera's mirror, as well. Depending on the focus, it becomes stronger or weaker, so I think it's somewhere on the camera... any ideas where to look?
Hopefully in the next few days I'll be able to show some of the better shots from the day
Seems like it. You wouldn't be able to remove it by cleaning the mirror. Your mirror flips up when exposing. If it was on the mirror, you'd only see it in the viewfinder, and not on the picture, not the other way around as here.
It would become weaker or stronger depending on the aperture used.
You'll find quite a few posts around the site, with info on how to clean it.
Question about the shot you posted: is it full-size, max-quality? JPG or RAW?
It also seems to be taken with a tele lens, and with a lot of heat haze (caused by temperature differences in the air through which you shoot). Very little you can do about that...
I would not clean the sensor. Simply blowing it with a quality blower (non-powered/non-can type) air blower should do the trick. Remove the lens, activate the mirror-lock up (in the menu), point the camera down and blow the dust away. Be careful not to hit the sensor with the blower (ie don't stick it too far in).
As for the quality, it has nothing to do the with camera. It's the conditions as mentioned above plus long tele and no sun.
Mikephotos From United States of America, joined Oct 2000, 2923 posts, RR: 53
Reply 7, posted (8 years 10 months 3 weeks 4 days 9 hours ago) and read 5749 times:
Quoting Airplanenut (Reply 6): I looked up in the camera manual (I know... shame on me for using the manual) how to clean the sensor, and it also said canned air (with no propellant... so now I just need to find some to buy).
I would recommend this (or something like it) instead of canned air...