JohnE wrote:
I follow the usual advice for cleaning both the front and rear surfaces of a lens.
Some dust is actually harder than glass and _will_ scratch the glass or coating it if it is rubbed in to the lens surface with a cloth, so I follow this cleaning procedure:
1) Use rocket blower to get rid of loose dust,
2) Use clean blower brush (i.e. a brush you have cleaned by wiping on a clean cloth to remove any dust from the brush) to very gently remove any stubborn particles and from around the edges. It is a good idea to blow air through the brush bristles (using bulb or a blower) to try to give them a charge to help pick up dust,
3) Then (and only if needed) it is a Calotherm cloth that has been kept in its protective bag.
However, I expect the level of care to increase with the cost of lens!

autumnlight wrote:
Thank you David, i couldn't find an update for the 100D either, but i'll definitely have a look at the Pentax Japan, thanks for taking the time to help, i'm on windows vista. I think i'll get my son on to it he's more computer savvy than me, thanks for the tip about the installation advise too, you've been a great help, i'm sorry i've only just seen your post.

ChrisA wrote:
On the K10D you can lock the mirror up and watch the sensor flopping about! Probably can with the K-5 too, at a guess.

davidtrout wrote:
Yes, I agree the tractor pix are just great. I'm with you Adrian when you say lens test reports can confuse. What's important to me is the result I get with the lens on my camera not what some magazine writer, probably with his or her own prejudices, writes.
David