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When Is It "Too Much" Dust In Your Lense...  
User currently offlineSpeedbird128 From Pitcairn Islands, joined Oct 2003, 1648 posts, RR: 2
Posted (8 years 9 months 3 weeks 2 days 19 hours ago) and read 3980 times:

Hi happy people,

I have a Sigma 80-400EX Optical Stabalised lense, and it's around 6 months old now.

I was giving all my gear a thorough cleaning the other day, and I have noticed a couple of dust specks inside the lense.

They are not visible on the photographs I take - or at least I can't see them  Wink.

At what point does it become too much dust- is that when you see the specks on the shots??

Thanks for any info

Cheers
Bryan


A306, A313, A319, A320, A321, A332, A343, A345, A346 A388, AC90, B06, B722, B732, B733, B735, B738, B744, B762, B772, B7
5 replies: All unread, jump to last
 
User currently offlineQANTAS077 From Australia, joined Jan 2004, 5855 posts, RR: 39
Reply 1, posted (8 years 9 months 3 weeks 2 days 19 hours ago) and read 3979 times:

Quoting Speedbird128 (Thread starter):
At what point does it become too much dust- is that when you see the specks on the shots??

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.



a true friend is someone who sees the pain in your eyes, while everyone else believes the smile on your face.
User currently offlineSpeedbird128 From Pitcairn Islands, joined Oct 2003, 1648 posts, RR: 2
Reply 2, posted (8 years 9 months 3 weeks 2 days 19 hours ago) and read 3971 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?



A306, A313, A319, A320, A321, A332, A343, A345, A346 A388, AC90, B06, B722, B732, B733, B735, B738, B744, B762, B772, B7
User currently offlineDerekF From United Kingdom, joined Feb 2001, 912 posts, RR: 0
Reply 3, posted (8 years 9 months 3 weeks 2 days 8 hours ago) and read 3883 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

Derek



Whatever.......
User currently offlinePetertenthije From Netherlands, joined Jul 2001, 3369 posts, RR: 12
Reply 4, posted (8 years 9 months 3 weeks 2 days 8 hours ago) and read 3857 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.



Attamottamotta!
User currently offlineSpeedbird128 From Pitcairn Islands, joined Oct 2003, 1648 posts, RR: 2
Reply 5, posted (8 years 9 months 3 weeks 23 hours ago) and read 3770 times:

Quoting Petertenthije (Reply 4):
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.

Correct - I use the blue sky at f22 technique to check for CMOS dust spots...

So I guess the few litte dust specks in the lense aren't critical. Goodie  Smile

Thanks for the input

Cheers
Bryan



A306, A313, A319, A320, A321, A332, A343, A345, A346 A388, AC90, B06, B722, B732, B733, B735, B738, B744, B762, B772, B7
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