No calibration needed. Take it apart in a methodical way and put it back in the reverse order. Work on sheets of clean laser printer paper on top of a couple of pieces of paper towel. Can you remove and replace a camera body screw without changing the shape or appearance of the screw-head? If this is true you can probably dismantle and reassemble a lens.
And I said before it is wise to avoid scrubbing the glass with lens cleaning tissue soaked in 'optical cleaning fluids' such as those made by Kaiser and other photo companies. They will spread any oily residue evenly all over the glass surface. Just use soap and water then get rid of it. Of course if you are a stone-mason, or a cello player, your hands might be a bit rough and then you'd have to be careful about cleaning the elements with fingers. The coating is rather delicate and can easily be scratched. But, believe it or not, it would take a lot of scratching to degrade the performance of the lens so you'd notice. Keep tools and fingers away from the diaphragm. In Africa fungi grow on camera lenses like crazy. After cleaning them I put the lens barrel and all the other metal parts in a lab dissector in which there was a small beaker containing a solution of formaldehyde. The vapour killed any remains spores and hyphae lurking there and ready to start growing as soon as the lens was put back together. I don't recommend formalin. It's nasty stuff and we know a lot more about it now than we did in those days. D Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002 ----- Original Message ----- From: "Kristian Walsh" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, August 02, 2002 1:27 AM Subject: Re: M50/1.4 fungus remedies? > Hi Don, > > That's just about possible for me to do -- I might even be able to talk > my way into getting use of a lab.. > > Problem is that I couldn't calibrate the lens afterwards :-( > > ... I'll just have to look for one without fungus, I think. > > -- > Kristian > > > On Thursday, August 1, 2002, at 01:52 pm, Don Williams Finland wrote: > > > Dismantle the lens. Clean all glass parts in hot soapy water with the > > fingers - Fairy Liquid is good. Dry glass components, on edge, on a > > clean > > surface in a dust free place - after rinsing off all traces of soap > > with tap > > water, followed by distilled water. Don't be tempted by solvents like > > alcohol. When dry put in microwave for a few seconds to evaporate the > > adsorbed water molecules. Blow off all dust that attaches itself to > > glass as > > you reassemble the lens. When lens is all nicely back together put it > > in a > > container that can be tightly sealed with a few packets of fresh or > > regenerated desiccant bags. Keep that way for a day or two. If the > > fungus > > reappears follow instructions given by Bob. Ideally this should be done > > is a > > dust free environment - a microbiology laboratory glove box perhaps? Of > > course if you don't have the tools needed for this job you'll need to > > borrow > > or buy them. > > > > D > > > > Dr E D F Williams > > > > http://personal.inet.fi/cool/don.williams > > Author's Web Site and Photo Gallery > > Updated: March 30, 2002 > > > > > > ----- Original Message ----- > > From: "Bob Blakely" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, July 31, 2002 1:36 AM > > Subject: Re: M50/1.4 fungus remedies? > > > > > >> Yup! > >> > >> Bet that in my younger days I could have gotten 92 mph out of a 50/1.4! > >> > >> (that's 148 km for you Canucks, Brits, Frenchies, Spaniards, Italians > >> and > > others who bowed > >> to the metric gods...) > >> > >> Perfection is 90 feet between bases! > >> > >> Har! > >> > >> Regards, > >> Bob... > >> ------------------------------- > >> "In the carboniferous epoch > >> we were promised perpetual peace. > >> They swore if we gave up our weapons > >> that the wars of the tribes would cease. > >> But when we disarmed they sold us, > >> and delivered us, bound, to our foe. > >> And the gods of the copybook headings said, > >> 'Stick to the devil you know.' " > >> --Rudyard Kipling > >> > >> From: "frank theriault" <[EMAIL PROTECTED]> > >> > >> > >>> Hi, Bob, > >>> > >>> Did you go to the "Nolan Ryan School of Photography"? <g> > >>> > >>> -frank > >>> > >>> Bob Blakely wrote: > >>> > >>>> Fungus remedy: > >>>> > >>>> 1. Find a brick or concrete wall. > >>>> 2. Place yourself approximately 7 meters from the wall. > >>>> 3. Hold the lens in your hand with the first two fingers of your > > hand on top of the > >>>> lens barrel and the "pocket" formed by your thumb and curled third > >>>> and > > forth fingers. > >>>> 4. Turn so that you are "3/4" facing the wall, keep your eye on > >>>> the > > wall. > >>>> 5. Lean back, placing your weight on your rear foot, lifting your > > forward foot. > >> Stretch > >>>> your forward arm out toward the wall. > >>>> 6. Begin to push forward toward the wall with your rear foot while > > at the same time > >>>> propelling the lens forward with your two fingers. > >>>> 7. As your forward foot nears the ground and your (was) rear arm > > whips rapidly > >> forward > >>>> with the lens, give that extra push forward with those two fingers > > thereby imparting > >> more > >>>> speed and a reverse spin which will add "lift" to the lens. > >>>> 8. Pick up lens and extract the excess glass fragments. > >>>> 9. Place on desk as paper weight. > >> - > >> 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 . > > - > > 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 . > - > 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 . - 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 .
