Matt, Just fyi, there are several tradenames for FRP, including Glasbord, Marlite, Kemlite and more. You want the stuff that has the bumps arranged rather...
I have a 24" f/3.34 dob and I'm looking for a coma corrector. I have tested the paracorr, but there is still a bit of coma on the edge. Is there another coma...
I've heard of someone using a barlow to eliminate the coma with an 25" f3. You may want to try this. You obviously lose the FOV but it shoud get rid of much of...
Raphaël, ... The edge of a film or CCD frame, or an eyepiece FOV? If an eyepiece, there is no one that can handle a f/3.34 light cone faultlessly by the edge...
Hi Nils ... edge. ... It was the edge of an eyepiece FOV ... Hum hum, so maybe its not coma due the telescope optics+paracorr ... maybe! ... in ... You mean...
Raphaël, ... the ... maybe! The paracorr isn't perfect (and TeleVue doesn't say it is) but likely it is mostly eyepiece astigmatism that you see (with a...
You could use a 3- or 4-lens Wynne corrector. I don't know who sells them and how much they cost, but they must be quite expensive. Richard ... edge. ... for...
Dear Group, I hope my little dob question can find an audience here. I currently have an (older) 11" Starmaster ELT with the Zambuto f5.4 mirror. Although I...
... some ... and ... debate ... Bill, I would not waste time with moving from a 11" to 12.5" You will most likely not notice much difference. With a leap to...
Just a few thoughts on two of your considerations 1. A lot of observing is done with a dob in parts of the sky where it is easy to observe anyway. What I mean...
Thanks for all your feedback! To sum up so far: Get the larger Dob! Not much of a gain moving up to a 12.5"! Wheelbarrow handles can make the weight...
Two other things I would add to that is get an Argo Navis and a ServoCAT. Charlie ... From: Wm Wolff To: bigdob@yahoogroups.com Sent: Thursday, September 02,...
Something I haven't seen mentioned that to some might be worth adding. Even with the Wheelbarrow handles there might be times you'll need to lift the Scope (or...
I own an Obsession. I have never used the others so cannot compare. However, with the wheelbarrel handles, I have never had to lift it at all. (except if I...
Hello Bill, Have you considered Starstructure telescopes? From a mechanical point of view, I think these are the best truss Dobs available right now (because...
I have an 18"obsession. I never had to carry it without the wheel barrow handles. Going up a ramp with my 18" requires lifting about 40 pounds (only 20 while ...
... Because of the price, I think that folks overlook the that Tscopes are designed to be compact and lightweight... the 14" Tscope weighs less than all the...
In the lightweight vs. wheelbarrow debate, don't forget that when removing the mirror or carrying the box, it's always a possibility that you will drop it -...
I want to thank everyone for their feedback! Your advice is much appreciated. We are very fortunate to have so many wonderful instruments to reach the stars. ...
I am new here and am trying to make a telescope for some kids, my problem lies in the primary mirror I have no telescope making experience, I want to make a...
Jerry, You may be interested in the Amateur Telescope Making group at: http://astro.umsystem.edu/atm/ On that site you'll find a wealth of information...
Jerry, that is a very ambitious project, especially the mirror, for one who's never built a telescope before. As experienced as I am with things mechanical, my...
can I make a tool to the right depth and equal diameter to the blank hook it up to "a drill" or something, place it over the blank and drill it into shape...
Jerry, You want to reference some books on astronomical mirror making. Some examples include: How To Make A Telescope: 2nd Edition by Jean Texereau:...
Has anybody tested the (new?) filter Televue OIII 2", and especially compared it to what I think is the reference (Lumicon OIII) ??? Thank you in advance ...
Hi Everyone, I'm in the process of removing the Ebonystar from the base of my homemade 18" (that should be fun), and replacing it with glassboard. Does anyone...
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