Earl Posted October 9, 2014 Share Posted October 9, 2014 Been looking at the new Opticstar scopes and this looks intrestinghttp://www.opticstar.com/Run/Astronomy/Astro-Telescopes-Opticstar.asp?p=0_10_1_1_245Ignoring Colour imaging but as a Ha scope, this looks quiet interesting. Link to comment Share on other sites More sharing options...
Phillyo Posted October 9, 2014 Share Posted October 9, 2014 Very cheap too. Interesting but worrying, often get what you pay for? :/Phil Link to comment Share on other sites More sharing options...
Earl Posted October 9, 2014 Author Share Posted October 9, 2014 This is true, however cheapness in optics is normally related to colour correction, ignoring that this looks interesting im almost tempted to try one.I wonder what the imaging circle is. Link to comment Share on other sites More sharing options...
Mark at Beaufort Posted October 9, 2014 Share Posted October 9, 2014 Earl I looked at this new range of scopes when I visited their showroom in Sale a few weeks back. They look ok for the money but its the view through the scope that matters. Being a Quad I am not sure where all the lenses are situated. If some of the lenses are at the rear of the scope would this be a problem for Ha or Herschel Wedge solar work?? Link to comment Share on other sites More sharing options...
Zakalwe Posted October 9, 2014 Share Posted October 9, 2014 I'd be cautious of some of the claims in the advert relating to solar viewing, especially this piece "Being an air-spaced refractor with metal knife edge baffles the ARC-152 QUAD is also ideal for imaging and viewing the Sun when used with a specialist (H—alpha) Solar filter at the eyepiece end." Doesn't this cope have the second set of lenses mounted in the focuser? If so, then Quark state " For telescopes under approximately 120mm of aperture, a screw in UV/IR cut filter can be employed in front of the telescope diagonal. The UV/IR cut filter reflects UV and IR light back out the front of the telescope, reducing temperatures inside. Do not use a UV/IR cut filter with oil spaced objective telescopes, or any telescope with an integrated rear field flattener or Petzval lens"http://www.daystarfilters.com/downloads/QuarkManual.pdf Link to comment Share on other sites More sharing options...
Peter Drew Posted October 9, 2014 Share Posted October 9, 2014 +1 for Zakalwe's caution. Link to comment Share on other sites More sharing options...
Zakalwe Posted October 9, 2014 Share Posted October 9, 2014 To qualify my earlier post, I'm not saying that the scope wouldn't work with something like a Quark. You would need to use a front mounted or sub-aperture Energy Rejection Filter with it though. Link to comment Share on other sites More sharing options...
Earl Posted October 9, 2014 Author Share Posted October 9, 2014 Sorry I should be clearer, Ha DSO imaging, id not consider Solar with this at all. Link to comment Share on other sites More sharing options...
michael.h.f.wilkinson Posted October 9, 2014 Share Posted October 9, 2014 This scope looks very much like a clone of the Bresser Messier 152/760http://www.astroshop.eu/bresser-telescope-ac-152-760-messier-ota/p,14195This is a Petzval design scope so Zakalwe's warning is an important one. I gather the scope might even have difficulties with a quark with a front-mounted ERF, because the telecentric lens system in the Quark does not work well with a Petzval lens just in front. These scopes do have a nice flat field, and from what I hear have better chromatic correction than the ST150 and clones. Link to comment Share on other sites More sharing options...
pete_l Posted October 9, 2014 Share Posted October 9, 2014 The description says: four lenses in two groups of two, Low-Dispersion (LD) Crown/Flint glass is used ... with two additional near full aperture optical elements situated further down the optical path and later: reduced false colourNot what you'd expect to read about a true Quad, but it's only 1/10th the price of a comparable instrument too. Link to comment Share on other sites More sharing options...
Earl Posted October 9, 2014 Author Share Posted October 9, 2014 This scope looks very much like a clone of the Bresser Messier 152/760http://www.astroshop.eu/bresser-telescope-ac-152-760-messier-ota/p,14195This is a Petzval design scope so Zakalwe's warning is an important one. I gather the scope might even have difficulties with a quark with a front-mounted ERF, because the telecentric lens system in the Quark does not work well with a Petzval lens just in front. These scopes do have a nice flat field, and from what I hear have better chromatic correction than the ST150 and clones.That Bressier is even cheaper ! wow. Link to comment Share on other sites More sharing options...
Peter Drew Posted October 9, 2014 Share Posted October 9, 2014 Not sure if the Bresser model is a "quad", the specifications don't mention it. If not, it would be suitable for solar observation. Link to comment Share on other sites More sharing options...
michael.h.f.wilkinson Posted October 9, 2014 Share Posted October 9, 2014 Not sure if the Bresser model is a "quad", the specifications don't mention it. If not, it would be suitable for solar observation. It is mentioned that it is a Petzval in several places (perhaps not the link I sent). That is only suitable for solar with a front-mounted filter. Link to comment Share on other sites More sharing options...
Peter Drew Posted October 9, 2014 Share Posted October 9, 2014 Thanks Michael. Good value then. Link to comment Share on other sites More sharing options...
Earl Posted October 9, 2014 Author Share Posted October 9, 2014 im waiting on hearing what the imaging circle is on these Link to comment Share on other sites More sharing options...
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