Quote:Here's how I cool my 7" Mak......
Rob 15" Obsession
Orion 180 Mak/Celestron ASGT
Towa 339 80mm f/13 Towa 312 80mm f/11
Quote:Quote:Here's how I cool my 7" Mak...... David, did you drill a hole in the diagonal and just attached the fan to it? Is there some kind of filter at the eyepiece end of the diagonal? Thanks for sharing!Rob
Quote:hi bob, it´s just a crude variation of a commercial cat cooler.http://www.lymax.com/sct/photos.phphttp://www.lymax.com/sct/how.phpthe air duct on mine is not centered but the concept is exactly the same.
7 X 50 Binoculars 102mm f/9.8 Refractor 14" SCT w/ CGE Pro 6" SCT 180mm f/15 Mak Atlas EQ-G GEM Pentax, ES, Baader Ortho & Sterling EPs.
Norme 150mm MCT f/13, 31% CO Yellow Zone "People say I'm in denial. I disagree."
Quote:does anyone know what the prime focus for the Orion 180mm is? I mean how far beyond the rear of the rear cell it focuses? I'm trying to figure out if I order the adapter to schmidt-cass ring, and add a 2 speed focuser, if it'll have enough in-focus with a 1.5" focuser body and 90* diagonal......ThanksBob
Quote:The hole is quite narrow. I use a moonlite dualmspeed on the back of mine with a 2" diagonal. You can get away with 2" fit EPs so long as the field lens is no bigger than the hole in the back. I will be able to measure mine tomoz if no one else has answered by then. I have yet to have a 2" EP fail tomcome to focus. Theres a lot of focuser distance in the Mak 180, well mine has at any rate.Widefield EPs ? Some are tolerable in the Mak some less so. The ES14mm 100' works ok ish. The 30mm 82' less so.Mostly I use a 2" diagonal and 1.25 orthos in the scope.Hope tha answers some questions at least.
Quote: OK, then why does Orion sell an adapter to 2" SCT like accessories for it? Ug.
The exit hole on the back of a Skymax 180 is 25mm in diameter (I have an older version of tyhe scope but I would think its safe to assume the newer ones are no different in this respect although the external fitting is different I believe) the exit port with the threads on acts as a field stop as far as I can tell as the light baffle is slightly wider inside the scope.
The field lens is the bit of the eyepiece nearest the telescope and furthest from your eyeball. ie the one at the bottom of the EP.
I find some EPs with wider field lenses work ok so long as your happy with the vignetting prodiced by the telescopes small rear aperture of 25mm. The widest bit of glass I have used iss an ES 30mm 82' and its horrible - the scope induces the EP into the 'ring of fire' syndrome where the edge of the EP glows with a bright ring. Its very distracting and generally very undesirable. On the other hand the ES 14mm 100' works ok(ish). it vignettes but the view on the centre of the FOV is perfectly fine. Lets face it if you want mega wide views of things then a Mak isnst really the ideal instrument to be using. Thats not a genative againts the Mak - all telescopes have their downsides (Newts are fussy with collimation and create coma, Achromatics produce CA and APOs are hellish expensive so nothings ever perfect - its always a compromise to some degree).
If you want a full on hit/review of my own experiences with a Skymax I wrote it all up here http://www.astro-baby.com/reviews/Skymax%20180/Skymax%20180%20Review.htm
The article covers my own personal journey with the scope and you may find it of interest.
Astro-Tech AT65EDQ 65mm f/6.5 ED Quadruplet Astrograph Stellarvue 50mm Finder Celestron Advanced VX Mount Lumicon 2" Deep Sky Filter CAMERA??
Quote:Hello.Looking at the Orion 180mm for imaging moon and planets using Mallincam Signature Video Camera. I understand that these scopes provide nice views of solar system objects due to its high f/15. Seems like a challenge is the cooling down, I live in northern California.. very warm in summer.. 100 F during daylight, high 70's low 80's at night. so do you think the cool down will be long. Again, Im looking to use this OTA for lunar and planetart video imaging. Thanks for any input.. I havnt ordered one yet, but have a few interested sellers..
Quote:I can keep it out in the garage.. garage is in the shade... I was thinking the 180mm Mak because of the feedback on its excellent performance with lunar and planetary.. so I was assuming it would be best for video imaging.. from what I get from your post, maybe not??
Quote:Well I should have my Mak-Cass by June 4th. Which 1.25" EPs (plossls I would assume?) would you guys suggest over 25mm?ThanksBob
Quote:Why you want lower power? Use refractor or dobsonian. Mak-Cass is great for between 100 and 250 power. Yes, you cam use 40mm eyepiece and I have 40mm eyepiece. Its about 67 power but I use Mak-Cass for planets and Moon. At least 100 power for best view! I rare use as high as 400 power because the view is blur and depends on how good night is.
Vixen AX103S Orion 180mm Mak-Cass Zhumell Z10 IOptron IEQ45 AT 72ED
Quote:After owning my Orion Mak-Cass for about 6 months, I am very much impressed. In the winter months it took some time to cool down, but now that it's summer time it is not much of a deal anymore. I took my first photos two nights ago under poor imaging conditions and to my surprise it pulled out many fine details from Saturn including Enke's division. It outperformed my buddy's 11" SCT in planetary imaging even in the poor conditions. I may have gotten a very good scope, but from what it sounds like this scope being very good is the norm. For visual observing, I use Celestron Plossls. The standard plossls outperform all my other eyepieces on this scope. As for a dual speed focuser, I would stay away from the Zhumell bargain dual speed SCT focuser. They are practically useless. I'd spend the extra $100-200 and get a better one.
Skywatcher BD 180mm f/15 Mak Intes M703 180mm f/10 Mak ED102 f/7 refractor Vixen LVW42, 22,13,8,5 and Vixen LV50
Ophiuchus Observatory - http://ophiuchus.com.br/
Carl Zeiss 10x50W JenoptemOrion WorldView 10x50WPSky-Watcher Equinox 66EDSky-Watcher Achromat 102mm(f/4.9)Sky-Watcher Maksutov-Cassegrain 180mmCelestron C9.25 XLT Carbon Fiber(mod)Sky-Watcher AllView + Celestron CG5-GT + Sky-Watcher HEQ-5 Pro