Improving a Tasco 11T
Posted 20 October 2006 - 12:42 PM
I have a an older red tube Tasco 11T that serves as my grab and go camping scope. The only problem is that the image tends to break down at around 150x. This after collimation with a 35mm film canister collimation gizmo.
Should I get a better collimation tool or should I replace the mirror? I'm thinking if I replace the mirror with one of the 114NT Newts from Meades' outlet I'll get better resolution. Seems like an inexpensive way to improve the mirror. Any thoughts?
Thanks for a reply,
Posted 20 October 2006 - 07:15 PM
I'd exhaust the collimation first. Borrow a laser collimator if possible and try it. I have the same scope in a Towa version and it's very sharp after collimation.
Try star testing to see if there are identifiable aberations.
Per John Siple's review:
Posted 20 October 2006 - 08:26 PM
I wish I could remember where that scope went.
Posted 20 October 2006 - 11:10 PM
Ain't it a drag living in cold places...gotta come back in because the glass is frosting....then go out again.
Posted 21 October 2006 - 08:10 AM
Posted 21 October 2006 - 10:30 AM
You didn't say - but, are you using the original (.965) eyepieces? If so, I would suggest that this is more of a contributor to your problem than the primary quality or collimation.
ALL of the old Tasco's benefit tremendously from higher quality eyepieces.
I'll never forget the first time I dropped some 1-1/4" Clave' Plossls into my 11T.
This was back in 1967.
The incredible improvement in image quality served to reignite my passion for astronomy!
Posted 22 October 2006 - 03:33 PM
Yes I have upgraded the focuser to accept 1.25 EP's. I too noticed quite a difference when I did that!