I think it's best not to discuss spammers on the forum, or what we might or might not be doing. They can read as well....

72ppi for projection and monitor (maybe 96ppi),300ppi for printing and publications such as books and magazines.

However, check the requirements from wherever you are sending the images to, as these may differ for optimum results.

Why not phone up a repair house and ask them?

I've never heard a squeak but if anyone has it will be someone who repairs lenses.

My eyes can clearly see the difference between 150ppi and 300ppi on a 6"x4" print. That's image resolution you're confusing ppi and dpi Nigel.

dpi refers to the printer resolution, how many dots of ink in an inch. Normally my printer prints at 2880dpi, but the original image is still 300ppi.

There are many questions and ifs and buts about it though. The first one is defining what we mean by "better".

For example, the crop factor means APS-C is better than FF for sports and nature shots. Our long lenses are even longer and if that's what we want, then APS-C is better.

Our cameras are more compact than FF, so for travel it could be argued that APS-C is better.

As for film, 35mm is much better than 6x9cm or half or full plate. More compact, more manageable, more versatile, faster to use, the list goes on.

Larger is not always better.

I'm sure you're right and I use it to clean my record stylus. A bottle has lasted me over 30 years for that purpose.

However, alcohols denature plastics and react in other ways also. What we don't know is what the special coatings are on the sensor, well strictly on the filter in front of the sensor. So I for one will be taking no chances with it.

Others will do as they see fit. I see this though as a potential pitfall in buying second hand DSLRs. We just don't know what the previous owner has been doing and it could be much worse than what we're talking about here. I'd rather hear "I've never cleaned the sensor" than "I've kept the sensor nice and clean" in this particular context.

There is no point in reporting them as we can see them very clearly when we log in.

They are removed as soon as seen.

There's no general pattern that suggests they are Algi, and we seem to have no problem with weather resistance in general.

This cover of AP is no different to any other and the K50 headlines, so that has to be positive, doesn't it?

But how do you know that iso-propyl alcohol doesn't damage the sensor coatings?

AP is also enthusiastic about the K-50. Next week it's the Q7.