You're a very brave man! B
On 18 Jul 2013, at 08:00, Rob Studdert <[email protected]> wrote: > Hi Team, > > I've been shooting a bit lately but I've had little time to post > process the images or even check my PDML mail. School holidays, kids > birthdays and a big burst of work came my way, the additional cash has > allowed me to clean up a lot of loose ends. I have been doing repairs > for work so I'm in repair and restore mode currently. I just finished > fixing a few things in my car that had failed and I did some toy > repairs, a phone touch screen replacement (a nightmare even for me) > and a few computer repairs too. More car repairs to go but I'm much > happier that the half dozen icons and messages have disappeared from > my view whilst driving. > > After testing my 77ltd for flare performance against my old A50/1.2 a > few months back and being totally disgusted with its contrast > performance I decided to finally determine what is actually causing > the problem. > > Contrast comparison: > > https://dl.dropboxusercontent.com/u/9304908/temp/77LTD%20contrast%20test%20IMG503059.jpg > > Test shot (jpg out of camera), still sharp just no blacks whatsoever: > > https://dl.dropboxusercontent.com/u/9304908/temp/IMG503052.JPG > > So I embarked on the task of pulling my 77 apart, not something that I > had great enthusiasm for I must say. The last/rear element is fixed > and comes away with the rear mount, that left me staring at the rear > group, which I then unscrewed from the lens body. In this assembly the > first two elements are cemented and the rear element of the group with > an internal air-gap. Looking at the external surfaces there was no > noticeable haze and looking into the group from the concave element > that sits closest to the aperture it appeared very clear. > > https://dl.dropboxusercontent.com/u/9304908/temp/13488_pentax_77_bud.jpg > > However it was a very different story looking into the lens set from > the rear, there was a definite haze visible and tilting the lens with > a light shining through it was plain to see where the contrast was > being lost. Not good, this means that the considerable haze is locked > inside the sealed and aligned 5th and 6th elements, damn. So I now > have to trek down a path that I was hoping not to have to and of > course I can't locate my lens wrench so as soon as the shiny new one > that I just ordered arrives I will set about setting free delicate > glass elements in my currently expensive paperweight. I will let you > know how it pans out, hopefully for the better. > > Curiously the chassis of the 77LTD is high density polymer :) > > https://dl.dropboxusercontent.com/u/9304908/temp/IMAG3228.jpg > > Cheers, > > -- > 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 > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
