Keyboard Shortcuts
Likes
Search
Re: C14 Edge secondary
|
Gary Jarrette
I would think that yes you are registering on one side of the secondary holder against glass, this in a perfect world should be sufficient to collimate the Telescope but because the primary might be at a slight angle to the axis of the scope the three collimation adjusting screws on the secondary are necessary to tilt the secondary in order to achieve perfect collimation. I would be concerned if there was not a washer under the nut as turning the nut against glass would make me nervous. Because the secondary is now setting at an angle rotating the housing will cause the collimation to be off. Think of it like procession. Rotating the secondary causes the axis of the secondary to wobble. So the rubber washer keeps the secondary from rotating and voil¨¢ collimation is preserved. I do not have the cooler fan but am sure it does a good job of equalizing the temperature. I do have a Hyperstar secondary holder so I must be careful to not turn too hard when reinstalling the secondary mirror nut. On Nov 2, 2015 5:53 PM, "Lee Gordon jleegordon@... [C14_EdgeHD]" <C14_EdgeHD@...> wrote:
> > ? > > Gary, if the secondary housing turns, it could compromise collimation in a "situational" sense, yes? In other words, tightening the housing and using the secondary outer ring should be sufficient; then recollimate and confirm during observation. > > The Cool Edge doesn't use washers; it's a metal device looking exactly an automotive carburetor. The key is that it not be tightened too significantly. It's actually a somewhat delicate operation. It's brilliant and saves for C14 users... > > > > However a loose secondary housing can complicate things... > > Carpe Noctem > > > > On Mon, Nov 2, 2015 at 1:57 PM, Gary Jarrette garyjarrette@... [C14_EdgeHD] <C14_EdgeHD@...> wrote: >> >> ? >> >> If the secondary is loose or has turned it is more likely than not that you have compromised your collimation. The amount that you normally have to turn the collimation screws when you are doing your final tweaks to the screws is infinitesimal so it follows that if you rotate the secondary or worse yet it is loose in all likelihood you will have to recollimate once you take care of problem number one. >> >> Some washers on the SCTs are fiber and therefore mire prone to slippage. They may over time even dry out a bit. I believe Dean down at Starizona has washers that are more rubberized in their composition and therefore less likely to slip. Starizona has them for all size of scopes. The material they are made of is Zorbathane. It is slightly tacky to the feel. >> >> Call Dean and order them and tell him Gary sent you. With that referal and five bucks you can get an over priced cup of coffee at Starbucks. LOL >> >> Gary >> >> Carpe Noctem >> >> Sent from my space ship via my LG V10. >> >> ? >> >> Hi Don. >> >> I'm a visual observer at this stage, and the same thing happens on my non-Hyperstar C14 EdgeHD secondary. I have a Cool Edge OTA cooling unit from Starizona that screws into the Fastar secondary just like a Hyperstar. At times while installing/de-installing there has seemed to occur reverse direction play in the entire secondary assembly. It is disturbing, but my sense is that it's likely common. >> >> Nevertheless, I too will be very interested in user comments. >> >> Lee >> >> On Mon, Nov 2, 2015 at 11:49 AM, don@... [C14_EdgeHD] <C14_EdgeHD@...> wrote: >>> >>> ? >>> >>> Hi All, >>> >>> >>> I have recently had the opportunity to work with the Mauna Kea Visitor Center here on the Big Island of Hawaii.? They have a C14 Edge equipped with Hyperstar that we use for live viewing of DSO's using a Lodestar X2c and Lodestar Live software.? We only do this two nights a week, so we install and uninstall the Hyperstar each night.? I noticed the other night that the secondary lens mount is loose on the corrector plate.? When installing the Hyperstar unit, it continues to turn even though it is seated in it's mounting ring.? I also noticed that there is a bit of play relative to the corrector plate.? I suspect this is not right.? Is there a threaded retaining ring that holds the secondary mount to the corrector plate?? Is it as simple as holding the outside ring and tightening the inside retaining ring.? Also, is it important to have the secondary rotated in a certain position relative to the corrector plate? ? >>> >>> >>> Thanks for any help on this. >>> >>> >>> Don >> >> >> >> >> -- >> >> >> >> Lee Gordon >> +55 (21) 3942-3430 (Skype) >> +1 (206) 200-9916 (c) >> +1 (206) 653-0019 (h) > > > > > -- > > > > Lee Gordon > +55 (21) 3942-3430 (Skype) > +1 (206) 200-9916 (c) > +1 (206) 653-0019 (h) > > |