Originally posted by jatrax Dust removal procedure in order:
1) Use the camera dust removal system. There is a menu setting to turn on/off. If you have dust run this several times in a row and then check for dust again. I leave mine on "run on startup" and I think that is best so you don't have to worry about it.
2) Use a 'rocket blower' or equivalent to blow off anything the shaker will not get rid of. Do not use compressed air or canned air. Some folks report it is OK to use canned air if you are careful, personally I'm not taking any chances but YMMV. You have to use the menu item to lift the mirror to see the sensor. Spraying air without lifting the mirror does not help clean the sensor.
3) Use a wet cleaning kit. This is the last resort, and on two cameras with over 25,000 actuations in all kinds of environments I've never had to use one yet. Get this if all else fails but don't go there unless you are sure you need it.
4) Send in for professional cleaning. Pentax extended warranty (in the US) includes one 'free' cleaning. Not sure about anywhere else.
Easiest way to check for dust is to set your aperture to f/22 or so and take an image of the sky. Dust on the sensor is more visible at smaller apertures.
Dust on the sensor is a fact of life for interchangeable lens cameras. You will get dust no matter how careful you are. Generally it goes unnoticeable unless the aperture is high (f/22 for example) or you are shooting plain walls or plain skies. A professional cleaning can be necessary but in my experience only very rarely. Most important is to set the camera's dust removal system to 'on startup' and leave it that way.
Thank you so much I have done 1 and 2 I have the clean function set for when I turn off as the birds seem to not like it when I had it on start up
Mine is not noticeable unless I take a shot of the blue sky so found your comment interesting, as to test it in store the white wall didn't show it up but the shot wasn't that clear that they took either
I had some sky shots on Saturday on which I have gone back and not seen them. I am wondering if when I changed my lens on Sat night to take a shot of the super moon the only time my lens has not been changed indoors may have done it.
Your comment has given me a few things to try and a comparison so thank you so very much. I haven't heard of a wet clean I will have to go look it up but think I would send it to pentax instead of attempting it, it sounds tricky and while still under warranty would rather let them take care of it.
---------- Post added 07-13-14 at 08:13 PM ----------
Originally posted by kiwi_jono We would need to see a photo of black marks to say if it looks like sensor dust (as opposed to dead pixels or something else).
Normally you don't notice most sensor dust until you stop down to f11+. If its visible at f8 then the sensor is getting pretty dirty and you need to do something.
If its a dirty sensor then you a bit unlucky to have to deal with it already but the steps jatrax suggests are the way to go. Except I usually use a lens with a smaller aperture than f22 available (The 18-138 does f38 at the right focal length) because the dust is easier to see.
I tend to be careful where I change lenses and also make sure I'm quick and efficient about it. Even so I have had to do 3 wet cleans so far - twice on my k-x and once on my k-5 (which seems to have a better dust removal system and probably the WR helps too).
Yes I am very careful too the lens or the camera are never left exposed for more than a few seconds at a time I too mostly use the WRs it is why I initially got the pentax to start with
. I probably am not a general user either though I shoot everyday.
Thank you so much for replying it is great to hear other experiences
---------- Post added 07-13-14 at 08:15 PM ----------
Originally posted by jatrax Agree 100% on that the k-5 is far ahead of the k-x as far as dust removal, and the k-3 appears to be even better. I'm not sure which system the k-50 has but if it is nearly silent then it should be the 'ultrasonic' one rather than the mechanical shaker in the k-x. Either way, if it is not on then it will not work. And IMHO the dust removal system is not something you activate after you have dust, it should be on all the time to keep the inevitable dust cleaned up.
I think the k50 is what I call the bone shaker definately not silent but I wouldn't call it loud either
thank you for your reply greatly appreciated.