Orion Atlas with EQMOD
QSI 683wsg-8, Astrodon Gen II LRGB, Ha
Money can't buy happiness, but it sure makes living with misery a lot easier!
Quote:(Certain) Meade SC-scopes can also be used with Hyperstar.http://www.hyperstarimaging.com/compatibility.php
Telescopes are instruments of hope and faith. Hope that a better, clearer and brighter universe can be observed. Faith that we can bring these discoveries back to our small planet and create positive changes for all of it's inhabitants.
Quote:Here are some thoughts where I am coming from:•SCTs inherently are herky-jerky design (here we go again with another not so optimal word) from collimation to mirror flop to focusers, etc.•Corrector plate is not a rigid structure in itself and was originally designed to house just the light weight secondary•HyperStar's fit, i.e., misfit, within the corrector plate gets mentioned quite often; stressing/flexing imparted by HyperStar is another cause for concern•Nothing against Starizona, but I have my doubts about Starizona's HyperStar design, workmanship, & glass quality... expertise (e.g., consider a “hypothetical” HyperStar offering form Takahashi on top of a corrected Mewlon for a "hypothetical" comparison)•HyperStar is limited to Celestron ONLY if I understand it correctly; not an SCT-wide acceptance as far as I know (in other word a proprietary offering, not an industry standard)•Obstructed design of SCT further gets compromised by cumbersome and further obstructing by imaging devices used with HyperStar•Spiking/obstruction caused by traversing connections•Rigidity of other designs, e.g., refractors, is just not possible in SCTs and HyperStar makes it even less rigid and more prone to stressing built-in tolerances of the SCT system•Fastness or short circuiting of optical path ramifications of HyperStar are whole another subject that has been discussed at length in another thread...•Uncorrected optics/folded design of SCTsI could go on but I think you get the idea... what I am trying to get at is that we have not so optimal/rigid original design of SCT that gets further compromised by HyperStar and that's what makes it NOT so solid and/or sophisticated. HyperStar may suit video or casual still astro imagery, but high quality/high resolution still astro photography remains the domain of un-obstructed and corrected optics. Regards
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
LX850 blog: www.LX-850.com
personal website: www.wadsworthobservatory.com
Quote: Not sure where you are going with Takahashi, but they don't offer anything like Hyperstar for the Mewlon.
I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Quote:The original design came from the 60" scope on Mount Lemmon. The scope was originally a cassegrain and got a new front end built to allow deep sky searches for asteroids.
Quote:As an astroimager who has a very satisfactory Hyperstar experience of almost 3+ years I cannot agree with your statement that HS is a crude platform.
Quote: I see only beginners using the Hyperstar.
Quote:How about alignment? Do you expect everybody to go through the same process as you did?
Quote:Quote:The original design came from the 60" scope on Mount Lemmon. The scope was originally a cassegrain and got a new front end built to allow deep sky searches for asteroids.To be fair, that was a classical Cass with a paraboloid mirror at F/4 or thereabouts. All that would be required to switch to prime focus would be removal of the secondary and addition of a coma corrector. Takahashi offered a convertable classical Cass/Newt for years. Converting an SCT with a spherical F/2 primary is much more of a compromise and definitely not the same design.It's OK to like Hyperstar but let's remain realistic.
Quote:My shooting or not shooting with Hyperstar has no relevance in this
Quote:I have bought a multipoint laser collimation tool from Hotech after discussing the possibilty to use this device to optically align all the components of a SCT+Hyperstar system with David. David is willing to invest into this area. The result will be more elegant and we will be sure of aligning the optical axis rather than having to rely on some mechanical properties to support my previous method. Of course, this laser is not cheap but still justifiable.
Quote:No idea what "fastness or short circuiting" means... sorry.
Others may disagree. Your millage may vary. Void where prohibited by law.
So most of you DO understand what I meant by short circuiting? Simple... regular SCT has three folds of light path, in HyperStar last one gets clipped. Consensus I would like to have is that HyperStar is condensing light of the last fold onto the sensor hence giving the appearance of fastness with some loss of resolution/image detail for a given sensor. Do you all agree? If yes, then we are all on the same page with this (whether it is good or bad is a different story).
Quote:Rod,I thought the SCT corrector plate is what is correcting for the spherical mirror and that the Hyperstar lens is correcting for other abberations such as coma and flattening the field. I don't think the Hyperstar is correcting spherical abberation.
Celestron Nexstar 8SE with 6.3 focal reducer SV 90mm SVT Raptor APO Triplet Refractor Celestron AS-GT (Hypertuned) Orion SSAG/Mini-guider Canon T3i DSLR modded with Baader UV/IR filter Backyard EOS/Deep Sky Stacker/Photoshop CS5
Chris"Where the senses fail us, reason must step in." - Galileo Galilei11" EdgeHDCGEM (w/ ADM Accessories)Ethos (21mm, 17mm, 13mm, 10mm), ES (30mm, 40mm)Baader clicklock diagonal w/ SCT clampOrion Ultrablock, Orion Skyglow, Celestron O-IIIDewBuster w/ Dew-NotOrion StarSseek WiFi w/ IPad2 (SkySafari 3)Hyperstar, QHY5 guider, Nightscape CCDStarbound Observers Chair
Quote:The Schmidt telescope was a modification of this concept where a secondary mirror was added to make a multi-purpose telescope.
Quote: I am a total amateur with no other imaging experience. It's easy to use and it works, and in my opinion relatively inexpensive. Oh, and don't forget, it's tons of fun.I'm moving to norther California soon, I can't wait to get out to some dark skies, away from the clouds and light pollution here, and try my hand at some more imaging.
Quote:Quote:The Schmidt telescope was a modification of this concept where a secondary mirror was added to make a multi-purpose telescope....and the corrector was relocated to about 1/2 the ideal distance from the primary. That's where SCT coma comes from.