art_major Posted December 31, 2013 Share Posted December 31, 2013 <p>Hey guys,<br>I have an old voigtlander petzval lens. I got it for a great price, because the front element on it was cracked through the center. the front element is a doublet and I managed to remove the cracked front element under a heat source. does anyone know of a Optical glass manufacturer that is able to make a Bi-Convex lens element? </p><p>THANKS!</p> Link to comment Share on other sites More sharing options...
john_shriver Posted December 31, 2013 Share Posted December 31, 2013 <p>Maybe http://www.jmloptical.com/<br> But it can't possibly be cost-effective. They will need to determine the glass type, measure the radius of both sides, and make a new element. Also, many old types of glass aren't available due to environmental regulations.<br> I'd say paint both sides of the crack black (perhaps even use the black paint as a simple glue), and then re-balsam the group.<br> In theory, given a blank of the right glass, this is a do-it-at-home project, just like folks make their own telescope mirrors. You need to cast lapping forms from the existing glass, and then use the proper array of grinding powders to grid down the lens. But finishing the edge and centering is challenging.</p> Link to comment Share on other sites More sharing options...
art_major Posted December 31, 2013 Author Share Posted December 31, 2013 <p>thank you for the response. have you used JML Optical before? </p> Link to comment Share on other sites More sharing options...
john_shriver Posted December 31, 2013 Share Posted December 31, 2013 <p>No experience with them at all. Just the second match for Google search for "custom optics". They're in Rochester, where there's a fine talent pool from the folks who used to work at the Kodak Hawkeye Lens Works.</p> Link to comment Share on other sites More sharing options...
Rick_van_Nooij Posted January 7, 2014 Share Posted January 7, 2014 <p>Surplus Shed offers a number of lenses at very reasonable prices. ( www.surplusshed.com )<br> I recently bought an old projector lens but it was missing the rear crown element of the Petzval formula. Ordered a couple bi-convex ones from them with a similar diameter. <br />Problem is I don't know the focal length of the missing element.</p> Link to comment Share on other sites More sharing options...
Jochepe Posted December 20, 2017 Share Posted December 20, 2017 Hello everyone, I wanted to ask art_major which serial number is the petzval lens that you have damaged? Thanks for your response, greetings. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now