13 Aug
2010
13 Aug
'10
7:24 p.m.
Sorry about being so unclear, I thought you might be a member of the
group in question.
Actually, it is quite the opposite, he keeps saying that you shouldn't
take a lens apart without having sophisticated equipment to collimate
the lens when putting it together again, as well as considerable
experience using the equipment, unless you want to have a clean but
expensive paperweight. He thinks that if you just put it back together
again the optical performance will be terrible.
I wouldn't know, I haven't tried. I'm not sure I believe that
companies like Minolta who made thousands of lenses wouldn't have
worked out a way to make the optical elements self-aligning or
something. It sounds like a lot of expense for a manufacturing process
for consumer items. Anyway he claims to have years of experience
designing stuff for spy satellites or something, however that might
relate to commercial camera manufacturing.
/Jonas
On 8/13/2010, ard at p850ug1.demon.co.uk (Tony Duell) wrote:
Well, if he's suggesting spaying soemthing into the lens (yes, I have
seen that suggested!), I certainly disapprove. If he;'s suggesting
removing the optical elemenets and applyuing solvent/lubricantmix to the
mount, then that's slightly better, but IMHO that's a method used by
people who can't handle tools and small parts properly, and if you're not
careful, it simply shifts the gummy lubricant, etc, elsewhere where it
will cause toruble lateer. I really do prefer to clean each part separately.
-tony
14 Aug
14 Aug
7:44 p.m.
Sorry about being so unclear, I thought you might be a member of the
group in question.
I read vey few Yahoo groups...
Actually, it is quite the opposite, he keeps saying that you shouldn't
take a lens apart without having sophisticated equipment to collimate
the lens when putting it together again, as well as considerable
experience using the equipment, unless you want to have a clean but
expensive paperweight. He thinks that if you just put it back together
again the optical performance will be terrible.
I find that hard to believe. I asusme he's suggesting that the radial
position of each elementis very critical, and has to be idividually set
up when assembly the lens (the axial postion is set by accurately made
spacers in any lense I've had apart). My experience is that the
elements do self-align when you fit he clamping rings, and very few
lenses have any method of adjustign that positon. Just about the only
lens I cna think of that does have such an adjustment is the infamous
DOmiplan (and tweking the 3 locating screws for the rear lens cell cna
turn a terrile lens into a merely awful one :-))
I wouldn't know, I haven't tried. I'm not sure I believe that
companies like Minolta who made thousands of lenses wouldn't have
worked out a way to make the optical elements self-aligning or
something. It sounds like a lot of expense for a manufacturing process
I would agree.
-tony
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