are dust spots at high f stops just normal?

Started May 12, 2005 | Discussions thread
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PeterF
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are dust spots at high f stops just normal?
May 12, 2005

on both my 300D and 350D, I get dust spots on my pictures at high f stops, say stops above 20. Doesn't seem to matter which lens I use which I assume is dust on the sensor. The spots don't show up at normal f stops, say 8.

So my two questions are:

1. Is this dust on my sensor,

2. If so, is it reasonable to expect perfectly clean pics with really high f stops without cleaning my sensor continuously?

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