I have a question (hence the message :p). I have polished now for 7.5 hours (after having to go back to grinding) and the polish is approaching completion....
I have a question (hence the message :p). I have polished now for 7.5 hours (after having to go back to grinding) and the polish is approaching completion....
You're picking up contamination from the cloth. After washing all the polishing agent off just give the mirror a quick rinse with distilled water and stand it...
Hi Mitchell, if you go on polishing you'll find easier to wash your mirror with simple neutral soap (better if it's not added with creamy components) and then...
Hi all, My name is Gabriel and this is my first post in this group. My question is: It is possible to make a mechanical mod on an old 60mm F/10 refractor so...
... refractor ... Hi Gabriel, WELCOME to the ATM_FREE Group! Unfortunately, the focal length of the scope is determined by the curves manufactured into the...
Thank you Ken for your kind welcome and answer. I would like to use the refractor as a guidescope but f/10 is too much to have a good images with short...
... As Ken said, you cannot change the length without changing the focal length; that requires changing the lens. There are other options too, but additional...
Hi, I´m very satisfied with a CeO dropper I built based on a mixer and a solenoid valve controled by a small PLC. The slurry falls by gravity after a...
... much I'm still a bit confused about whether you are going to use the optics as an imaging guidescope or as part of an autoguider setup. If guiding...
Thank you very much to all those that answered to me. Ken and all, I want to use a ST237A camera for autoguiding with the refractor as a guiderscope. To have...
Gabriel, I am no expert, and I can assure you Ken's ability is far superior in these matters, but you want a greater focal length for your guider then the main...
Thanks Rob, I understood what Ken explained to me and what you are telling me. What I will do is try again whit F/10 more concientiously nd deeply because the...
Hey everyone. I'm probably 95% of the way polished out now after around 8 hours. But no matter what i do i can't catch a break. Everytime my mirror goes under...
... after ... last. I ... huge ... tried 1/3 ... figured a ... worse. ... instead of TDE. ... a lot of ... developing a ... nearly the ... (or turned ... ...
Mitchell... You are experiencing an APPARENT TDE caused by working the center of the glass. As you work the glass, the center becomes deeper and the edge...
I've been working a 6" mirror all week trying to reduce a turned edge. I used a very short 1/6th COC stroke with the mirror on top. The basic result of the...
... edge. I ... mirror ... do ... the ... rid ... Tony... What you were seeing was NOT a FLAT but the appearance of a sphere at ROC under the Focault test. You...
2 Questions... 1. How to determine the material a lens is coated with. 2. How to safely remove the coating without disturbing the optical surface underneath...
... basic ... to ... and ... get ... at ... radius ... that ... edge ... like a ... would ... exactly ... Well i thought a 1/3 W was to parabolize, but i'll...
I understand that Ken. When I said flat I really meant it's appearance under test at the ROC where a sphere looks flat I do understand that it's actually a...
Thank you so much for your excellent advice and sppedy responses. I really wanted to have a "nice" ashtray mirror instead of just an ashtray to bring with me...
Ken, I'll try to write something about your second question. Two years ago a master optician told me that in case of removal, some coating could need...
... be a total ... If your helping me anyway through e-mail with the other stuff there is no need to "keep up appearances" here. This message just as pointless...
I use a wet, synthetic chamois cloth for this purpose. It gets most of the CEO residue, doesn't scratch the glass ( i would worry about a dry cloth doing...
Last year about this time I premiered a new 18" classical cassegrain using OMI optics and a Resource Intl frame (the so called CPT18). The scope gave some nice...
