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car mirror

(18)
ok it work whit the cleaner see phoito about 20mmX 50mm A- now do a 20x20 is ok or i need a bigger secondary the computation said bigger but whit a
savardjacques@ymail.com
18
posts
Aug 27

howt verify the focal of a lens

(4)
photo lens If you illuminate the lens with a beam of plane parallel light (bright) and can look into the lens from the front you can see if the entire entrance
jacot
4
posts
Aug 13

Re: howt (sic!) verify the focal of a lens

(3)
Ok Mark Christensen Jeremy Royston I probably setup a kind of optic bench whit my old mecano kit and made the mesure you sugges Hello Jack, Is there any
jacot
3
posts
Aug 13

Stripping chromium

(10)
There is no question in my mind, that the most productive engineers who ignore statements like "you can't do that, it was already tried". That was told to one
paul valleli
10
posts
Aug 10

crayford focusser

(17)
Theoretically, Charles, a point contact will cause a great attraction force called the "VanDer Waal's Force". If the contact area is clean, the molecules lock
paul valleli
17
posts
Aug 2

stuck pitch lap

(15)
Hi Rick, Your welcome and very glad this method worked for you. Good luck in completing your mirror once your able to resume working on it. John From:
John Vogt
15
posts
Jul 22
radicell2
10
posts
Jul 20

Identifying Glass Types for a Doublet

(22)
... Peter, It might also be noted that the N-BaK2 and N-BaSF64 combination can be used as the secondary doublet glasses to get a relatively short (<25%
Richard Snashall
22
posts
Jul 11
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