Speedbird128 From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 5 months 4 weeks 1 day 23 hours ago) and read 5219 times:
Quoting QANTAS077 (Reply 1): it's usually the dust on your camera sensor that's the problem when you review your images, my lens has a bit of dust on it and i have recently cleaned my sensor and i have no dust spots.
It's the same scenario for me wrt the sensor - obviously because the dust blocks light reaching the sensor and thus causing spots it's more critical to keep clean.
I was just wondering at what point do I send my lense off for a cleaning?
DerekF From United Kingdom, joined Feb 2001, 920 posts, RR: 0
Reply 3, posted (10 years 5 months 4 weeks 1 day 13 hours ago) and read 5131 times:
I had some interior dust on my Sigma 170-500 and was told it was fairly common on lenses like that and that it would make very little difference to the photos. I certainly didn't see any difference.
Sigma were going to charge around £80 plus postage to clean it so I didn't bother.
Zooming out in dusty conditions causes suction apparently.
I did find some useful info by searching Google though.
Hope this helps
Petertenthije From Netherlands, joined Jul 2001, 3560 posts, RR: 10
Reply 4, posted (10 years 5 months 4 weeks 1 day 12 hours ago) and read 5105 times:
If you put your longer lenses against a chain link fence, the fence will be largely (or even totally if the zoom is long enough) filtered out. Same goes with the dust spots on the lense. The reason the spots on a film/sensor show is because they are at the end point. The sensor can not "look around" it, and will therefor show it.
If you use a very low aperture (or high, whatever, i keep mixing them up) the spots might show up though. But only the larger ones. I'd be surprised if a grain of sand would show.