On 19/06/2013 04:01, peternew wrote:
On 6/18/2013 4:44 PM, Savageduck wrote:

Then as recommended above a microfiber cloth or Pec Pads are the way to
go. Also for persistent spots a non-water fluid should be used. I
recommend Eclipse Optical Cleaner.

http://photosol.com/


Unflavored vodka or denatured alcohol will work.Just dapen part of the
cloth, and use the other part for drying. The trick is not to rub, just
pat.

I'd be surprised if either were pure enough although it depends exactly
what they were flavoured or denatured with. Isopropanol that has been
stored in a glass bottle is one of the better lens cleaners.

I am old school and prefer a strip of lens tissue for cleaning lenses.

You can buy lens cleaner from any photodealer, but you should be *very*
gentle when cleaning and leave as little residual solvent on the surface
as possible. Under no circumstances scour the surface or rub hard as
every tiny scratch diminishes the contrast of the image.

Paradoxically a "dirty" lens still works pretty well unless you are
facing into the sun with the front surface illuminated! You can easily
make things permanently worse by too frequent or aggressive cleaning.

--
Regards,
Martin Brown