Funny - this guy mus be VERY honest! And perhaps not too carefull with his lenses ;-). They are probably great anyway. I use very little deturgent (for dishes - sulfo), preferably demineralized water, and later (naturally) lens paper. I clean lenses only once or twice in it's lifetime. That is NOT too often, I believe. And I use a blower without a brush. I prefere not to touch the elements at all.
I alwasy keep them in a cupbaord, a camera bag or in use on the camera. I try not top leave a lens on the camera (will ruin the aperture action) and always stoped down, naturally - and standing rear elemenet up with protecting filer (UW or Sky) and caps - at lest the rear cap on. That's all. Jens Bladt http://www.jensbladt.dk -----Oprindelig meddelelse----- Fra: Bob Sullivan [mailto:[EMAIL PROTECTED] Sendt: 8. marts 2006 00:42 Til: [email protected] Emne: Re: bright spot on rear lens element? Jens, We are not pulling your leg. Read the listings that Igor references. The guy TALKS about bright spots on the rear element of his lenses. He is not referencing bright spots in his ebay listing photos. Regards, Bob S. On 3/7/06, Jens Bladt <[EMAIL PROTECTED]> wrote: > The bright spot is a reflection of the light source used to make the > photograph. Isn't it? > Are you pulling mye leg...???? > Regards > > Jens Bladt > http://www.jensbladt.dk > > -----Oprindelig meddelelse----- > Fra: Bob Sullivan [mailto:[EMAIL PROTECTED] > Sendt: 6. marts 2006 02:20 > Til: [email protected] > Emne: Re: bright spot on rear lens element? > > > Does the guy know how to clean a lens. > Are his lenses clean, or are his bright spots residual oil? > I wish we knew if he used residual oil remover (ROR). > A film of oil (grease) about one molecule thick will change reflections. > Regards, Bob S. > > On 3/5/06, Igor Roshchin <[EMAIL PROTECTED]> wrote: > > > > > > Hello! > > > > While watching a few e-Bay auctions for SMC-P lenses, I noticed > > that all lenses from this seller have > > "a bright spot on the rear lense element": > > > > > http://cgi.ebay.com/Pentax-zoom-28-70mm-f-4-0-SMCP-FA-Autofocus-Lens-Extra_W > 0QQitemZ7594561955QQcategoryZ48558QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > http://cgi.ebay.com/Pentax-Telephoto-SMCP-FA-100mm-f-2-8-Macro-AF-lens-NR_W0 > QQitemZ7594559450QQcategoryZ48558QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > http://cgi.ebay.com/Pentax-Normal-SMCP-FA-50mm-f-1-4-Autofocus-Lens-NR_W0QQi > temZ7594556499QQcategoryZ48558QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > http://cgi.ebay.com/Pentax-Wide-Angle-FA-24mm-f-2-0-AL-IF-AF-EX-rare-NR_W0QQ > itemZ7594551547QQcategoryZ48558QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > http://cgi.ebay.com/Pentax-Telephoto-SMCP-FA-300mm-f-4-5-ED-IF-AF-lens-NR_W0 > QQitemZ7594569810QQcategoryZ48558QQssPageNameZWDVWQQrdZ1QQcmdZViewItem > > > > http://tinyurl.com/q29el > > http://tinyurl.com/rdyp6 > > http://tinyurl.com/lmp5v > > http://tinyurl.com/rtxb5 > > http://tinyurl.com/s5j9b > > > > So, I am curious, what could be possible causes of this? > > > > The guy mentioned notorious cleaning of the lenses, so my > > guess was that it could've been caused by using some wrong solvents > > for cleaning, so that the SMC is removed, but I am not sure if > > there is any coating on the rear element. > > Moreover, if I had to guess, I'd say there is none. > > > > Any ideas? > > > > Thank you, > > > > Igor > > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 03/03/2006 > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.2.0/276 - Release Date: 03/07/2006 > > -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.2.0/276 - Release Date: 03/07/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.2.1/277 - Release Date: 03/08/2006
