Re: Interior lense dust/dirt
One other thing to consider is that what passes for a large speck of dust or debris may, in fact, be very, very small. I've removed the front element group from several lenses in order to remove some large particles of debris, only to find them to be a lot smaller than they appeared. The lens clearly magnifies these particles, so, in most cases, I wouldn't worry about it much, although I used to. Here's a little test anyone can do that will show how little, if at all, these particles affect the final image. Grab your camera and the lens of your choice, except for super wides, and get thee to a chain link fence, or even a window or a door screen. Put the lens right up against a link, or up against the screen, and observe how little the image on the focusing screen is degraded. I'll bet in many instances you won't even be able to notice any degradation, especially with a 50mm lens or greater. Rob Studdert wrote: > > On 10 Jan 2002 at 11:18, Mike Gezing wrote: > > > After looking at all my lenses in > > this manner I found that particles of dirt were more prevalent in zoom > > lenses vs primes and appeared to a greater degree in size and number in > > older lenses vs new. In fact my three newest lenses all primes were clean. > > > > Has anyone one read any material on this matter or done any testing to see > > if this is a real problem. Again I was not seeing dust but what appeared to be > > small flects of paint. > If you have to use a halide light at a curious angle in order to see them isn't > probably not that big a deal. If however there are big noticeable chunks (often > flaked paint or the product of wear in older lenses) then maybe it should be > cleaned. However there really needs to be a lot of junk in a lens for it to > make a visible difference. -- Shel Belinkoff mailto:[EMAIL PROTECTED] http://home.earthlink.net/~belinkoff/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Interior lense dust/dirt
On 10 Jan 2002 at 11:18, Mike Gezing wrote: > After looking at all my lenses in > this manner I found that particles of dirt were more prevalent in zoom > lenses vs primes and appeared to a greater degree in size and number in > older lenses vs new. In fact my three newest lenses all primes were clean. > > Has anyone one read any material on this matter or done any testing to see > if this is a real problem. Again I was not seeing dust but what appeared to be > small flects of paint. Hi Mike, Zoom lenses collect more dust over time since as the lens is zoomed it's displacement changes hence air has to rush in to fill the new space, prime lenses are far less problematic in this instance and some IF lenses don't change their displacement during focussing at all. Many lenses including expensive Leica glass have dust in them on initial delivery, mostly it's not a problem. If you have to use a halide light at a curious angle in order to see them isn't probably not that big a deal. If however there are big noticeable chunks (often flaked paint or the product of wear in older lenses) then maybe it should be cleaned. However there really needs to be a lot of junk in a lens for it to make a visible difference. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Interior lense dust/dirt
I have begun to notice these fine speck of"paint" on my 35-80 4.5/5.6 but not some much on my main lens the 80-200. Dave Begin Original Message From: Mike Gezing <[EMAIL PROTECTED]> >Again I was not seeing dust but what appeared to >be small flects of paint. >Regards, Mike - Pentax User Stouffville Ontario Canada Sign up today for your Free E-mail at: http://www.canoe.ca/CanoeMail - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
