C10NGT, Z8, 150 Rumak, XLT 150, C6, C5, SW5 Newt, 4.5 Ball, C102GT, C90, ST80, A70LF; 15x70, 25x100; Burgess BV; Paracorr II; T6 2.5, XO 2.58/5.1, Ethos-SX 3.7, Delos 4.5, TV Plossl 7.4-26, BCO 10, Hutech HC 12.5, Sterling 12.5-25, ES100 14, CZJ H 16/25, CZJ O 16, M5k UWA 24, T5 31, Ultrascopic 35, Titan-II 40; Bino Pairs M5k UWA 6.7, Baader Zoom 8-24, M5k SWA 24, TV Plossl 26, RKE 28.7; Zooms NZ 2-4, NZ 3-6, Leica ASPH 8.9-17.8, Baader 8-24; Baader Zoom Barlow, VIP Barlow
15" f/5 Tectron
Mallincam Junior Pro
TMB 40mm Paragon,Leica ASPH zoom,
WO binoviewer w/assorted pairs
"Yeah, well, you know,that's just, like, your opinion, man."
Quote:I don't think Telrads are perfect... The length could easily be cut in half. Which brings up another fault of this finder: it is too low to the OTA. Without a riser, it can be uncomfortable to get close enough to the OTA to sight through the Telrad, and you risk bumping the scope...Some Telrad owners use the three concentric circles to help them star hop to objects. This always seemed more trouble than it's worth.Do I really want to put this much effort into planning and executing a star hop? No, not really. So I don't. I like to "plan" my star hops on-the-fly. I find the naked-eye star nearest to the object, sight on that star with the Telrad, and then star hop with my 15x70 optical finder, referencing a good printed atlas or StarSafari on my tablet. IME, this is much easier than trying to star hop with a naked-eye, 1x finder.
Tom Polakis Tempe, AZ Visual observing, DSLR photography, lunar & planetary imaging http://www.pbase.com/polakis/
Time spent looking at the stars is added to your life
Bashful, Misty, and little Ralphie - my heavenly stars
A-P 105 Traveler ~ TEC 140 ED ~ TEC 6 MCT
A-P Mach1 GTO ~ Losmandy GM-8 ~ TV Gibraltar
Quote:They are bigger and bulkier than they need to be.
Quote:The length could easily be cut in half. Some users have actually done this - cut their in Telrad in half to save space on the OTA. Sounds like a good project to me.
Quote:Without a riser, it can be uncomfortable to get close enough to the OTA to sight through the Telrad, and you risk bumping the scope.
Quote:Also, Telrads dew too easily. The Telrad is the first thing to dew over on my scopes. There is no good solution to the Telrad's dew problem - I've tried them all, I believe
Orion ED80 - AT Voyager with TNT,pier ext.,Vixon steel tray and Manny's mod.
Omni 120 cg4 with Orion pier ext. and RA drive, Binotron-27 (25mm & 17mm Sterlings)
Orion XT10(Original F/5) SkyStopper Equatorial Platform
Jason Constellation Model 311(Modified with 1.25"Crawford Machine focuser & rings)
Quote:I use a Telrad on both of my dobs, and a Rigel Quickfinder on my refractor. In all honesty, I have always felt that the Telrad is just about the most useless tool for starhopping ever created, for the reasons that you already laid out.
12 Skywatcher Collapsible Dobsonian (coming soon, two more days, be here Tuesday)
Celestron C102 HD " Carl"
Scope brand 60mmx 700mm " widger scope"
Celestron Comet catcher(orange tube)"Scott"
60mm Telescope Club
Celestron C11+EQ6, skywatcher /Zambuto 12"dob,watchhouse tracking platform, 16"/Zambuto lightbridge , Ethos's 6,8,10,13,17,21. Naglers 31,26. Lieca ash zoom, televue 2.5 powermate,2"2x powermate .Paracorr type2. Howie glatter 2" laser & Tublug. Lumicon 2" UHC, 03, H-Beta,Televue smoothies ( all of em) , Meade 4000 smoothies ( all of em). That'll do for now.
Celestron Nexstar 8SE, C6, TV Geniesis, Orion 4.5 Starblaster, Coranado PST, Discovery 8" DHQ, Orion 90mm F10.1 Binoculars:Nikon 7x35,Canon 8XIS, EP's 8 to 24 Hyperion, 2 TV zooms 55,32, TV plossel. 24,19,35 Panoptic, 16T5,11T6,7T6 and 5T6 Nagler CG5GT,TeleVue systems mount on ash tripod.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Kmart 40mm-Thanks Mom|Jason60mm-Thanks Dad|C80SS-Thanks Wife|C90|C102|C6XLT|AP130EDFGT|C-11XLT EQ-2|EQ-3|CG5GT|Mach 1 & Eagle "For once you have tasted flight, you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return".-Leonardo da Vinci "We're all in the gutter, but some of us are looking at the stars."-Oscar Wilde ~RIP Dad, you were my best friend...Godspeed!~
Quote:Sorry for chopping up your post.
Quote:Agreed that Telrads are anything but perfect. As you point out, they are too long and too low. If you don't care for the three rings, the high-profile Rigel Quickfinder seems like it would be the preferred option.
Quote: I don't plan star hops, either, but I would defend the bullseye circles as being much more useful than a single circle. If the bullseye rings had an arbitrary size, they would have limited usefulness, but the 1/2, 2, and 4 degree diameters are great for comparing to a chart with a grid. I have a pretty good feel for angles on the sky by now, and those diameters are just about perfectly designed.
Quote: I agree that a combination of a 1x and a low-power finder is the way to go. It will be interesting to learn how you fare using a finderscope with very low magnification. Something with a 15-degree field (4x or so?) that goes to magnitude 8 or 9 under a dark sky might be enough to really improve matters.
Quote:I use both a Telrad and a RACI finder for star-hopping. The Telrad is faster to get me to the 'hood, then the RACI takes over.
Quote: If you are good enough working with plastic to shorten your Telrad, shortening the riser should not be an issue. I haven't shortened my Telrad, but I have disassembled my risers and rebuilt them to better suit my needs. They are plastic and glue or epoxy works fine.
Quote:I use Rigel finders now, but must acknowledge Telrad as the original classic!
Quote:The Telrad isn't perfect--just better than anything else.
Quote:I hate the Telrad! I have turned down the purchase of used scopes because it was mounted to them. In my mind it devalues them. I think for dobs they may be the right choice, but when I see these slapped on top other scope types...I cringe!!!
Quote:For my dob I prefer the telrad. Yes there are some negatives but it is the one I use the most. I do like GLP's but when its anywhere near cold or light they do not work. All IMO; Don t.
Quote:Man, you'll really cringe when you learn that there's a Telrad on the 48" UK Schmidt at Siding Spring Observatory, and on the 60" at Mount Wilson, shown below. I have seen Telrads on other observatory scopes, and they are only installed for the case when the pointing is not established or working correctly.
Quote:I hate the Telrad! I have turned down the purchase of used scopes because it was mounted to them. In my mind it devalues them. I think for dobs they may be the right choice, but when I see these slapped on top other scope types...I cringe!!! Just me and my own hang-up!
Quote:Rod,Quote:The Telrad isn't perfect--just better than anything else. Give me time ... I'm working on that.Mike
Quote:I wouldn't be surprised if someone hasn't mounted a Telrad on an ST80 or binoculars!
Quote:Man, you'll really cringe when you learn that there's a Telrad on the 48" UK Schmidt at Siding Spring Observatory, and on the 60" at Mount Wilson
15" Obsession #1603 AstroTech AT66
Quote: If you don't care for the three rings, the high-profile Rigel Quickfinder seems like it would be the preferred option.
NP-101 on a DM-6
Teeter 11" STS/Waite Mirror
Zeiss, Fujinon, Nikon, Vixen binoculars
Quote:I tried to love the Telrad; I failed. The mounting plate is still on my Dob because when it is really cold, below zero, it keeps on working like a champ when everything else gets too sluggish (Sky Commander) or fails (GLP). I do use lithium batteries.Dark skies.Jack
Quote: Quote:I wouldn't be surprised if someone hasn't mounted a Telrad on an ST80 or binoculars! Guilty, I am a 'Telradista' Eric
Quote:As you may know Mike I use the Telrad exclusively on my Dob,no optical finder for me. Having to add two more dew heaters and more battery power for the optical is the only reason I don't use one. FYI I have no issues finding objects/star hopping, red dots are all I ever used. I do use the Rigel finder on small refractor.
• Celestron Ultima 8, f/10 • Zhumell Z12, f/4.9 • Intes MK-67, f/12 • Celestron C5 Orange Tube, f/10 • WO 80mm Fluorite APO, f/6.9 • Carton 60mm ATM, f/16.7 • a few Plössls, a few Orthos, a few Königs, an Erfle or two, a few SWA, a few UWA, a couple SUWA... • CG-5 ASGT, CG-5, & AT Voyager "It's amazing what you can see if you look... " Yogi Berra
Quote:Yes I use Sky Safari on a smartphone, with its telrad circles it makes finding things easy. The longest focal length EP I have is 22mm and it hasn't been used in but made 3-4 times last year. One night I was finding objects at 380x because I was too lazy to remove the barlow under the 14mm, it was cold that night. My 14mm is my finder EP.
Quote: when it is really cold, below zero, it keeps on working like a champ when everything else gets too sluggish (Sky Commander) or fails (GLP)
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote:I suspect the ES finder won't be a replacement for the Telrad. The TFoV of the Telrad is huge.
17.5" f4.1 Manual Discovery Split Tube Dobsonian (Love 100 AFOV and wide TFOVs).
Denk II Dual Power Switch 3x3=9 powers x3 OCS = 27 power options per eyepiece pair.
2.3x40 to 25x100 Binos (and many in between).