Can't remove secondary mirror '''

[Bobbyoutback]

I'm asking for help here as the scope I'm trying to get the secondary out of is new to me ' being a 12" GSO F/5 .

I can remove the plastic holder with the mirror but after then removing the one clip the mirror won't pop out ?

Hope they don't glue it in :rolleyes:

Bobby .

[Saturnine]

Hi Bobby

You will probably find that the secondary is held in the holder by a silicon adhesive. That being the case, they can be a bugger to unattach, why do you want to remove the secondary mirror anyway.

[Bobbyoutback]

Hi , I wanted to see if i could remove it when needed , also the stock size is to big for ultimate performance .

Bobby :)

[Ukastronomer]

Two things confuse me

1. Why would you want to see if you can remove it without needing to remove it
2. How can it be too big

[Bobbyoutback]

Hello ,
My calculations say the supplied secondary is oversized for a 12" F/5 system ,
I can drop down a bit ( secondary size ) to get less visual defects by going to 20% central obstruction .

Cheers
Bobby . :)

[xelasnave]

Gcc

Work out the area difference between the two and you will find it is a very very small percentage of total area. And I bet the difference between your current secondary and you envisioned reeplacement will make no practical difference.
Alex

Buy more silver with your savings
Alex

[Startrek]

No real benefit replacing the secondary unless it’s pitted, scratched or broken
More bother than its worth

[multiweb]

If you really want to remove it I'd get a little piano wire and try to cut the bond at the back this way. That's the only way I can think of doing it unless the baffle can somehow be removed. Sometime it's screwed on.

[bojan]

Oversized secondary is good for photohraphy.. especially with "full frame" (or larger) sensor. And, difference between "ideal" and 20% larger obstruction is negligeable.
Visibility will be your limiting factor, not the size of the secondary.


Leave it be.


BUT.. if you really want another one for whatever reason, why not replace the whole spider and keep original mirror as spare?

[Saturnine]

Some wise words here, if it ain't broke, don't fix it.
As has been said, the difference of a few percent in secondary obstruction in anything but perfect seeing conditions will be almost unnoticeable.

[Bobbyoutback]

Thanks guys for all the advice , I will have to reconsider going smaller now .

Cheers
Bobby .