OK, it's late in the thread but I'll chime in. Like most of the previous posters I've experienced little problem with dust in my lenses, even zooms but of course zooms do generally displace more air unless they are of the internal mech versions. What I have experienced problems with is haze forming on the internal lens surfaces (generally each side of the aperture mech) leading to overall reduced contrast, failed aperture lock mechanisms on some of the cheaper lenses, front elements becoming loose and focus helicoids becoming rough and noisy. As I'm fairly competent at repairs I generally do my own lens repairs, it's really not that difficult if you are thorough and patient and prepared to invest in a basic set of good tools.
On 25 March 2013 09:58, Mark C <pdml-m...@charter.net> wrote: > I have never had problems with dust accumulating in lenses, and I have > several old primes. I guess if I take the brightest LED flashlight I have > and shine it in the lens I will see some dust. MOre evidence that this > world is not perfect but nothing to get worried about. > > Lenses *do* wear out. I wore out a an A* 200mm macro - the mechanics just > plain wore out after hundreds of thousands of shots. Lenses are mechanical > devices and all mechanical devices wear out. Second law of thermodynamics. > Personally, I think that sending a lens out to be cleaned is both a waste of > money (the net reuslts of the cleaning is likely to be minimal) and probably > more damaging to the lens (the additional entropy introduced by taking the > lens apart and putting it back together is probably worse that the > accumulated entropy of the lens just gathering dust.) I clean my lenses > regularly with a microfiber cloth, lens pen, sometimes with lens cleaning > fluid. If I do something that causes concern - like dropping the lens a > significant distance - I will send it in to get checked out. Cmaera bodies > probably benefit more form CLA's than do lenses, but that rule applied more > to old film bodies that one could reasonably expect to use for many years. > Most digital bodies go obsolete and are replaced well before they need to be > CLA'd. > > but don't expect lenses to last forever. Mechanical components deteriorate. > Lens elements separate. The adhesives used in multi-elements fog or get > fungus, lots of things happen. When they go, toss em and get new ones. > > Mark C > > > On 3/23/2013 7:15 PM, Zos Xavius wrote: >> >> Ok, sorry this is turning into a long ramble. My question is that how >> do I deal with constant dust accumulating in my primes? Is this >> something that's just to be expected and I should look at sending >> lenses out every few years for cleanings? > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
