going to quark it up combo style...maybe

[sooot]

as the title suggests you quark hooligans have turned my head, but I'm looking at the combo styled one to use with my c9.25 and/or skymax 180, the only thing that is baffling me is the ERF, ive sent over some questions to daystar but it be nice to hear advice from you lot. Am I going to have to buy 2 ERFs or can I buy telescope cells where the ERF can change over from one to the other because those filters are not cheap also size is it going to be a case of the bigger the better?

[Davey-T]

Don't think you can use a quark in C9.25 or any kind of reflector.

Dave

[Moonshane]

I suspect you could use a smaller off axis erf in a reflector as long as the mask is light tight but even if it is possible (and I am not sure it is) I would not recommend it as a cheapish frac provides all the detail you need. I bought a 90mm derf for an old tal and created a pst mod stage two.

[sooot]

http://www.daystarfilters.com/COMBOQuark.shtml

the new quark designed for sct/mak telescopes but also can be used in refractors

[Moonshane]

Cool. Don't scrimp on the erf though you literally risk destroying your scope, your quark and naturally worst of all your eyes

[sooot]

I know, but buying one erf that could interchange on to two scope cells would be ideal, daystar sell off axis cells for the end of the scope but don't say if the erf is fixed, I await there response

[Luke]

I'm a bit confused by it Craig.

I have an 8 inch SCT but what ERF setup would I be looking at, this one with 75mm off axis?:

http://www.icstars.com/Store/daystar/accessories/energy-rejection-filters/off-axis-erf-for-8-sct.html

Am I missing something here, wouldn't a second hand ED100 outdo it for detail?

And if I could only use 75mm of the 200,  I think I'd rather buy the Skywatcher ED80 and standard Quark? Much smaller, lighter scope, a touch more aperture, I must have missed something?

[sooot]

am unsure luke, that's why ive posted on here for a bit of scrutiny, from what ive read a sct needs an off axis erf where as the maks can use full aperture, like you say whats the point of shoving big heavy expensive scope on the end when a cheaper refractor can give more aperture

[michael.h.f.wilkinson]

I tend to agree with Luke. The aperture on an off-axis system is roughly 1/3rd of the aperture, so just 67mm for a C8, and just a bit more for a C9.25. Not that big.

[Stu]

It does seem like a potentially interesting product, being able to get full disk views up to 1800mm focal length means I could use the Vixen with a sub aperture D-ERF and get full disk? Does that sound right?

I tend to agree though that the benefits of an aperture masked SCT or Mak are questionable vs a smaller 80 or 90mm refractor.

[sooot]

even if I used the skymax 180 and use the native f15 which apparently is allowed to use full aperture, then a baader d erf comes in at a whopping £1500, think ill stop looking

[sooot]

Hello Craig,

I am Andrea, the Customer Service and Media Specialist at Daystar. I will be more than happy to assist you with your questions.

To prevent damage, we strongly recommend using an Energy Rejection Filter. You have two choices for Energy Rejection Filters (ERFs). This can be a UV/IR cut filter mounted before the diagonal, or a full aperture red or yellow glass ERF mounted in front of the telescope.

The front mount would need to be custom made for your telescopes, but the UV/IR rear mount does not.

The QUARK Combo could be changed over from the Celestron and the Skymax, you would just need to remove the wedge adapter that comes with it, it is not needed for F/15 or greater refractors.

Please let us know if you have any further questions, or concerns.

Thank you,

[sooot]

So what do you make of that?

[Peter Drew]

I tried a 5" Celestron with a full aperture ERF as a PST mod, the results were disappointing compared to using a 5" F10 refractor. I'm not convinced (yet) that a SCT/Quark combo would be a better bet. 

[DrRobin]

Hi,

The only advantage I can see is if you only have one scope (a large SCT), but want to use it for solar Ha.  If you take a 8 ~ 11" SCT and use an off axis ERF then still only have a fairly small aperture.  Of course you get your nice focuser and fairly long focal length, but it doesn't look as though you are going to gain anything over a standard Quark and a 80mm refractor.

Plus the cost of the off axis ERF is probably more than the cost of a cheap refractor or a good second hand one.

I bought a second hand WO Zenithstar 80mm for my Quark (about the same price as the ERF), works great, I had a 2" Baader UV/IR filter so put that in, but it doesn't really need one.

Robin

[Pete Presland]

So what do you make of that?

Just for a second I thought you were Andrea