This is the type of question that interests me as well. Given that the blemish that I see in your image is more or less one pixel large, have you considered the possibility that this may be a lazy pixel? Does it disappear under wider aperture? Could it have been just a small ICBM in the sky?
What spot of dust?
I think you're seeing something else. The spot circled has a diameter of about 40 pixels. Try adjusting the contrast in Photoshop to 100% and then adjust the brightness until you can see it.
OK, I do see it. It is only barely visible under normal contrast.
It could be dust or it could be a stain. If normal sensor cleaning methods don't remove it, that doesn't mean it's not dust, by the way. At the size particle we're looking at, and with the smoothness of the glass, the van der Waals forces can become very significant. Think of a gecko climbing a sheet of glass. The same forces are involved. Of course it could also be a chemical adhesion or something else. The point is, I don't think you can rule out dust based upon this picture.
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
"Ruling out" is too strong a modality for what I am saying - of course I don't really know.
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
No, I don't think so. We're looking at an effect that is circular and relatively uniform in brightness, but that doesn't mean that what's on the sensor is round, flat, and uniform in thickness. It's more likely to be a shadow of a speck. What you're seeing is the penumbra of the dust particle. The penumbra is larger than the dust particle. This is why stopping down is recommended to reveal the dust -- it reduces the size of the penumbra, thus increasing the contrast.
You're the one who said they were squashed, not me.
I had asked myself whether it could be something like that. I have some reservations with respect to the plausibility of this scenario.
On the other hand, Glenn Barber's recent posting seems to support your theory.
But several tries with the rocket gotto blaster got rid of them.
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
Question: Which camera was being cleaned? I'm curious if the 20D,
because of the smaller mirror chamber, is any harder to clean than
the other DSLRs. Thanks.
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
The real question is "does it show up in a print?" If not, forget it. Even if you spend the next several days fretting and cleaning and manage to get rid of it (assuming it is actually a single pixel dust spot), the next time you change lenses something else will be be back.
Yes, that is more or less it.
This is an abbreviation for Inter-Continental Ballistic Missile
--
But several tries with the rocket gotto blaster got rid of them.
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
Any other recommendations? What do you use and how frequently?
I did my first sensor cleaning today and noticed that there is a
small spot I cannot get rid of. It is really small and barely
noticeable. I took a shot of the sky and here is a 100% crop. Am I
being unreasonable that I try to perform perfect cleaning? Is there
no such thing as a perfectly clean sensor?
