secondary mirror size

[Bluknghtv (Daniel)]

guys wondering if anyone knows what the size of the secondary mirror is on a Skywatcher 300 f4 quatrro? I need to get a split dew heater for it but there are a few sizes to choose. I rang skywatcher but they are not sure either.

[Startrek (Martin)]

Daniel
If you go to the Skywatcher USA website they have all the specs for the 300mm f4 Quattro
Secondary is 102mm diameter
All Skywatcher scopes and mounts are manufactured in China by Synta Taiwan and distributed to Skywatcher distributors around the world. I would assume it’s the same scope you buy from Skywatcher Australia ( Tasco Sales ) at Brookvale in Sydney
Cheers
Martin

[Bluknghtv (Daniel)]

thanks for that mate. I checked the web but not the u.s site. The ozy one didn't have a break down. The guys at synta didn't even know.

[billdan (Bill)]

Wow that's a big secondary (102mm), my 14in f4.65 Skywatcher only has an 80mm secondary in it.
I guess shorter focal lengths need larger secondaries.

[Paul Haese]

Originally Posted by billdan

Wow that's a big secondary (102mm), my 14in f4.65 Skywatcher only has an 80mm secondary in it.
I guess shorter focal lengths need larger secondaries.

Bill, viewing Newtonians don't need as large a secondary for that reason. Astrographs require a larger secondary for imaging. The secondaries on my AG12's are 110mm and but have focal lengths around 1180mm.