Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon Lenses

Thread Tools Search this Thread
Old Jul 13, 2009, 2:07 PM   #11
Join Date: Jun 2003
Location: Savannah, GA (USA)
Posts: 22,371

I'm confident the OP meant the 70-200mm f/4L. ;-)
JimC is offline   Reply With Quote
Old Jul 13, 2009, 4:22 PM   #12
Super Moderator
Mark1616's Avatar
Join Date: Oct 2005
Posts: 7,396

I agree, although I'm liking the thought of 20-700mm f4...... can you imagine how large that would be though LOL.
Mark1616 is offline   Reply With Quote
Old Jul 13, 2009, 6:06 PM   #13
Senior Member
pj1974's Avatar
Join Date: Jun 2005
Location: Adelaide, South Australia
Posts: 2,913

Actually, I'm sure it is the 20-700mm F4 IS L lens that's the culprit. But I'm willing to be kind and buy it off you for $20 (if you could pay postage costs.... how large is that lens by the way!) The zoom range is handy, but you don't want a lens that produces dark spots. (this is a joke!)

Ok seriously now, all jokes aside, I'm also 90% sure those spots are dust on the sensor. As Mark and Jim have suggested (and I agree) - you might need to use the "swipe" method of cleaning the sensor.

My trusty Canon 350D (Rebel XT) has taken over 60,000 photos in all sorts of climates and conditions in many countries over the last 4 years. From the tropics of SE Asia to snow capped mountains in Europe, from beaches near my home to wet rainforest to Australia's arid outback.

Over this time I have cleaned the sensor using the blower about 12 - 15 times. The blower method usually dislodges most of the dust. Then when some stubborn dust particles remained I used the wet / swipe method on 3 occasions only. Each time the sensor came out almost perfectly clean after the swipe method.

While I do change lenses frequently even outdoors, I am careful when I do this - e.g. never doing it on a windy day at the beach, nor say after I have just sat down on a couch (sofa) or bed, as this will release dust particles into the air. Do be careful cleaning the sensor, a soft and methodical approach is needed - but is effective!

All the best. Do let us know how you go.

pj1974 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 12:28 PM.