no white wall you can use ceiling, or a piece of paper, or anything is plain,I understand that I can check for dust using a small aperture like f22 shooting at a white background but thats more for like at home right? What I'm asking is how to verify on the spot at the service center after they've cleaned my sensor.
Small aperture around f/16 with a clean white or light-coloured background should be gd enough. On monday I brought my 5D for sensor, viewfinder and focusing screen cleaning. After an hr when collecting, I checked again and the usual dust spot is still there so I requested on the spot to clean again. 10mins later, was done by another technician and my focusing screen replaced with a new one.
Hi,
Read in one of the photography books, you can point the camera at a light source, and shoot with lens wide open. Any dust on the sensor will show up immediately.
Frankly, never tried before but good if you do not have any white wall around. Surely we can find a direct light source.
wow thats value for money there~ =P
anyway, i usually turn to manual mode, set to the smalleset aperture you can, then take a long long exposure, and direct it towards the ceiling and point it around. the idea is to disgustingly overexpose the whole screen/image, then check for black spots in the resultant image. generally it works for me.
Small aperture around f/16 with a clean white or light-coloured background should be gd enough. On monday I brought my 5D for sensor, viewfinder and focusing screen cleaning. After an hr when collecting, I checked again and the usual dust spot is still there so I requested on the spot to clean again. 10mins later, was done by another technician and my focusing screen replaced with a new one.
Wow they replaced the focusing screen FOC?
Haha u wait long long ah, it costs $11. I suppose they didn't clean it as the focusing screen is easily scratched, so they replace it instead.
I see, coz I am thinking of changing my 5D focusing screen, and CSC asked me to go to the showroom at Vivo instead...