Just tried out another feature with the ServoCat that I had never used until last night. It is the Easy Track with my Gen 2 SC and it allows tracking without...
Today after cleaning my 17.5 inch mirror (Discovery 17.5 f5) for the first time in two years I was walking it through a room and bumped it against the back of...
Ouch, thats a bummer. I really doubt you will ever notice a difference at the EP. In one of my scopes I have a chip out of the secondary, about 5% is missing....
I know that over the years I have heard several folks mention that in this case they would blacken the area of the scratch so there would be no light scatter....
You know it may only have the coating scratched and not into the glass. So when you get the mirror re-coated it will be as good as new. Anyway for now, I...
I just finished a 16 inch f/5 Dobsonian following the Kriege design in his book. Its my second dob and this time I have a balancing problem. The cage end is...
You could shift the altitude bearings down a little, but I often trim my big scopes a couple pounds light at the top end and use a small counterweight. That ...
Hi Karl, The easiest way is to add a small, or a couple of small counterweights to the cage in an out of the way place. You can take it/them off if needed in ...
Thanks for all your input. I does appear to be more of a scuff than a scratch so you're probably right that it will disappear when I eventually get the mirror...
Thanks guys. I've thought about moving the bearings, but how do you calculate how much to move them. I definitely don't want to overshoot and have a top heavy...
Karl, if you don't have a shroud around your truss tubes try making one. My 18" dob came out a bit light in the secondary cage. I made a shroud out of a...
Karl, You might try some ankle weights. In each ankle weight, there are 4 or 5 individual packets filled with BBs. They measure around 2” x 6”. You can add...
The suggestion to use ankle weights is a good one.Most of us have problems getting enough weight on the lower end!On my 20" NightSky I have a Televue Ranger...
That's what I use on my Discovery 17.5" Truss Tube. Except I attach them to my Mirror Box. Works fine! I bring 20 Lbs. of Ankle Weights with me. Clear, Dark...
On the cage end of my home built truss Dob I used a left over piece of the plastic covered thin wall steel tubing from $1 brooms at a dollar store that I used...
Very true, the longer leverage of the cage end means much less weight needed to adjust the balance then if trying to do it from the rocker box end! Bruce...
Sounds like the scope might be a hair tail (rocker box) heavy, but not enough to be a problem if it stays positioned with an eyepiece in the focuser. Try...
Right! Meant mirror box handle to attach ankle weights. Paul ... attach them to my Mirror Box. Works fine! I bring 20 Lbs. of Ankle Weights with me. ... I ... ...
John Hall of Pegasus Optics made my 18" f4.3 mirror- gives exquisite views. Others such as Galaxy and Intermountain Optics are also other great choices for ...
What I did was buy a used Coulter 17.5 mirror cheap and built my Dob around it using Krieges book. After completion I used it for a couple months and sent the...
Thank you Mike, This is a great start. I have not built a dob before so this will be a slow process. If you have any pieces of wisdom to share I would be more...
http://www.astromart.com/classifieds/details.asp?classified_id=450541 Have seen Meade 16 inch F4.5 mirrors out of Starfinder GEMs and Dobs on the used market. ...
Meade made some good 16" mirrors and Jim Nadeau of Night Sky Scopes use to build his 16" scopes with the Meade mirror option. One of our club members has a...
HI, Ive been reading this group for a couple of weeks - this is the first time I've piped in. I converted a Starfuinder dob 16" F4.5 to truss tube. What I...
... check out Jim Mulherin's group http://groups.yahoo.com/group/Torusmirrorgroup/?yguid=90811424 he has a couple, ready to polish that are a GREAT price, you...
i have a 16 inch mirror that i was going to build into a telescope started building the box with baffles in it and now either want to sell the mirror or get...
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