Dovetail plates and saddles advice for Mach 1?
Posted 27 March 2009 - 09:02 AM
I realize an 8" saddle (such as the one AP sells) will handle the 13.5" and give me room to slide things back and forth for balance. However, I want to eliminate the possibility of flexure as much as possible (esp. with the 140 beast) and a 12" Robin Casady seems like it might be ideal in this regard (AP makes an 8 & 16 but no 12). I'll certainly have room to slide the OTA within the rings and it looks like the Casady plate can also be mounted off-center to help with balance if necessary.
So - any thoughts? Would I be making a mistake going with a 12" saddle or am I just making too much of this? Hard to imagine that a 13.5" plate is going to flex much in an 8" saddle.
BTW, I already own 3 8" Casady saddles (used in a tandem bar arrangement) so I don't plan to buy another 8" in any event so I guess I could always swap out the 12" saddle for some set-ups. My impression is that the Casady saddles are a little nicer and beefier than APs - would anyone disagree with that claim?
Posted 27 March 2009 - 09:51 AM
I have a 12 inch Casady saddle and it's a great piece of gear. It can be offset, if needed.
I cannot imagine you needing anything longer than an 8 inch for your scope. A 13 inch dovetail is going to have little overhang and I just don't see a 140 causing that to flex.
But if you want to swap for one of your 8 inchers, let me know.
Posted 28 March 2009 - 06:28 PM
Ron, I might take you up on that offer to trade the 8 Casady for your 12, but I'll try living with the 8 for a while and see what I think.... BTW, which part of cloudsville VA do you live in? I'm in cloudsville/c'ville and man, hasn't that been the truth for the past couple of weeks !!??
Posted 28 March 2009 - 08:34 PM
Posted 29 March 2009 - 07:39 AM
I'm up in Gainesville. This month started off great, but has been terrible since. I feel sorry for the Messier Marathon guys in my club. This is the second year in a row they have been defeated by weather.
I have downsized my scopes and could get by with the 8 incher, but I prefer the Casady saddle over anything else and will keep it for now.
Posted 29 March 2009 - 09:05 AM
12" cassady on both my Mach1 and 1200. I like that they are both tilt in aswell.
I've not seen an AP saddle for Losmandy D series - I assume it is tilt in as well, no? My DOVE8 is tilt in for sliding bars. Or maybe "drop in" is a better description.
Posted 30 March 2009 - 11:39 AM
I was worried about flex as well - a call to the great folks at AP convinced me that the 16" saddle was best for my reflector and a 14" DMM with Los. clamps should work well for refractors.
And..it's a really beautiful piece of work!
My 2 cents...
P.S. It's tilt-in as well and it uses wide blocks to clamp the plates as opposed to the 8"'s pins. I'm not familiar w/ Cassidy saddles...
Posted 30 March 2009 - 01:33 PM
Posted 30 March 2009 - 05:34 PM
The individual clamps on the Casady dovetail have 2 steel guide pins each, captive knobs and are "springed" - all nice touches, IMO.
The Casady 8" is more expensive than the AP version.
Posted 30 March 2009 - 08:55 PM
The only difference is that I'm using the TEC 12 inch plates (Losmandy compatable).