Explore Scientific 102ED Triplet Orion Sirius EQ-G Half Hitch FTX/Oberwerk Tripod. ES 100* 20mm, 14mm TV 3-6mm Zoom Baader 8-24 Zoom.
Matt in Oz Takahashi Mewlon 210 F11.5 = 2415mm Takahashi TSA120 F7.5 (out on loan) = 900mm Takahashi FC76CSV F7.5 = 570m Takahashi FS60CB F5.9 = 355mm
John H Visual astronomy on the Blue Ridge since 2004
Quote:I'm curious about your price comparisons...looking at the respective websites, the DSV-2b looks to be significantly more expensive than the other two.And speaking of price, the M2 is going to come in very close in cost to the FTQ after you add to the M2 a MEC column (mandatory, to clear tripod legs) and pay the upgrade for a Losmandy size saddle (IMHO a vixen style dovetail does not cut it for a 4" ED scope).I have owned mounts similar to the M2 and to the FTQ (an M1, and now a Nova Hitch). Assuming similar respective characteristics, the M2 and FTQ will both serve the purpose...but I'd quickly go for the FTQ as the more sophisticated and enjoyable mount--especially since the price difference is small.As for the DSV-2, that'll be a matter of personal choice and usage. Yes, the DSV is "more" mount...but as you've noted, that also means more weight & size, plus it will be more complex to balance during use.Your choice of tripod looks like a good one, whichever mount you decide on.
Quote: As for the DSV-2, that'll be a matter of personal choice and usage. Yes, the DSV is "more" mount...but as you've noted, that also means more weight & size, plus it will be more complex to balance during use.
Quote:Not sure if Losmandy saddle is required, my scope came with Vixen cradle rings and its working just fine on my Sirius Mount.
Quote:Yeah, but it doesn't have the up-down balancing at the saddle like the FTQ, which I've found on the Nova Hitch to greatly simplify achieving/maintaining perfect movement while staying-put when let go, regardless of altitude. Just a different design philosophy.
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
Quote:Stellarvue M2: 2014 model says re-designed and they have removed slo-mo since their new design is so good no slo-mo is required
Quote: Quote:Stellarvue M2: 2014 model says re-designed and they have removed slo-mo since their new design is so good no slo-mo is required The purpose of slow motion controls is to provide fine control of positioning. Regardless of how smooth the action is, slow motion controls are a big plus when using a small refractor at high magnifications. It's like the difference between single speed and a two speed focuser. No matter how smooth the single speed is, the two speed allows for finer control. 300x is within the capabilities of a 4 inch. Slow motion controls are quite wonderful.. Jon
Nova Hitch alt-az mount
Quote: Jon,Why do the manufacturers think the otherwise? Both Stellarvue and Hitch mount things slo-mo is not relevant with their upgraded technology.
Quote: In the old days, before the Vixen Portamount and others paved the way for the modern, alt-az mount complete with slow motion controls, folks like me often used equatorial mounts converted to alt-az use.. The Vixen Polaris and the similar-sized Mizar mount both were designed so they could be used either as equatorial or alt-az mounts. EQ-1 and EQ-2 class mounts also were alt-az capable without modification.It might seem paradoxical that someone such as myself who has manually tracks a Dobsonian at magnifications approaching 1000x finds the slow motion controls important for these small refractor mounts but there are good reasons for the need, it's inherent in the geometry.Consider a 4 inch refractor like my NP-101, there's maybe 8 inches, maybe even a foot as a lever.. At the other end of the spectrum is something like my large F/5 Dob, it has a focal length of over 10 feet, the OTA represents a 10 foot lever.What that means is that for equivalent angular motions, the refractor requires movements that are about 1/10th that of the dob.. with a 12 inch lever, 1mm motion represent about 11 arc-minutes, with a 10 foot lever, 1mm of motion represents 1.1 arc-minutes. In this manner, there is a 10:1 equivalence... In some sense, tracking the Dob at 500x requires the same fineness of muscle control as tracking the NP-101 at 50x... This is not so intuitive, I realized the importance of the lever one evening when a Newbie who had never seen a telescope was soon tracking the big scope at 300x-400x, I asked myself, how could that be? Mounts for small short scopes benefit from slow-motion controls, large scopes, not so much. Jon
Quote: Once balanced the movements are effortless, requiring next to no pressure, and it's easy to track the target.
Quote: Quote: Once balanced the movements are effortless, requiring next to no pressure, and it's easy to track the target.
So... do you find you are able to manually track at 300x without disturbing the image? An example would be tracking a tight double and the double is still cleanly split?
Quality slow motion controls allow continuous tracking if so desired. It does require a stable mount. Do you find this possible without slow motion controls?
Quote: Put another way, I've always found using alt-az mounts to be a bit of a compromise vs. an equatorial mount, but I don't feel the "degree of compromise" changes whether I move the scope manually vs. use slow motion controls.Best regards,Paul
Quote: Quote: Put another way, I've always found using alt-az mounts to be a bit of a compromise vs. an equatorial mount, but I don't feel the "degree of compromise" changes whether I move the scope manually vs. use slow motion controls.Best regards,Paul Paul:I find that I am able to track more precisely with slo-motion controls.. I think of a manual EQ mount, it's rare to see one without slow-motion controls..Jon
Celebrating the 30th anniversary of the USFL, when football was more than a game.
That's me in the avatar running back a pass I intercepted for a touchdown
Skywatcher 120ED Refractor Assorted Zhumell Planetary, Skywatcher and ES eyepieces, a 2x barlow and a few filters. iOptron MiniTower II Sony NEX 3 for astrophotography
Scopes: 12.5" dob w/Lightholder mirror, Astro Tech AT8RC, TPO 8" Imaging Newtonian, Intes MK-67 Deluxe, Takahashi FS-60CB, Tasco 10TE, Coronado PST
Best! Dave - 12" f/4.5 mod'ed to truss rod Dob with Telrad. - Explore Scientific ED152CF f/8 Triplet Apo - AP900 GTO mount on a PWT Pinnacle pier - Orion SkyView Pro 100ED f/9 - Celestron Advanced VX mount - Free Turn Q - TV Delos 6mm, HP SV 30mm; Baader Hyperion 8mm,17mm,21mm; Stratus 13mm; ES 82* 4.7mm & ES 70* 25mm EP's... HP 2" 2x Barlow. - Nikon D700 & D7000 DSLRs and lots of Nikon glass