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Looking for scope to use with a quark for visual

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#1 NorthernlatAK



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Posted 22 September 2019 - 10:25 PM

I'd like to get into solar using a quark as it seems the best option with a budget to dip into solar. I'm looking for a reasonably priced scope in the 80mm-100mm range with an f ratio between f7-f10. My budget is around 400$-600$ for scope and decent mount. Any suggestions out there?

#2 MalVeauX



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Posted 23 September 2019 - 06:42 AM



I would make sure you're looking at scopes with pretty good focusers while at it. Lots of great achromats and ED scopes can be had that have pretty poor focusers to handle the weight and torque of a large imaging train like a diagonal, quark and eyepiece (especially with binoviewers, which I suggest highly for solar viewing!). Plus, it's nice if the scope is nice to begin with and useful for other things as well. So I would actually look more towards an ED refractor for this because you'll get a good focuser and good machined/mechanics with good glass without paying a huge price. In these smaller 80~102mm apertures, there's a lot of competition so there's great prices. Bigger ones, well, that's where an achromat starts to become more attractive for cost. Because again I cannot stress enough having a good focuser for this.


Also keep in mind, with a Quark, to maintain a full disc FOV, you will need a focal length around the 400mm length. That's a short scope. I wouldn't try to do "both" so it's beneficial to have a short scope for full disc viewing and a larger aperture scope with longer focal-ratio for high resolution viewing. I would not suggest larger aperture than 102mm for visual for the most part due to seeing limits.


Here's what I'd look at for best in class for your budget with great focusers:


From T.S.:





From Astronomics (same scopes, rebrands, just the AT80ED isn't available just yet, but it's excellent for this for cost):





If the scope & mount have to fit into that budget, you will have to compromise a lot some where, so I would then point you towards an Omni XLT 102 F10 on a CG4 (this can be used as EQ or AltAz). Good mount. Good scope. The compromise is the focuser. It's "okay" but I would replace it with a GSO 2" Crayford (96mm flange).





Other mounts to consider would be things like the SkyView Deluxe, Porta II and Twilight I perhaps.


And these are great binos (highly suggest binos for solar viewing, it's a game changer!)




No matter what you go with, I would suggest 32mm plossls as your primary eyepiece(s) to 25mm. The effective focal length with a Quark is quite long. So you'll want to use wider, longer focal eyepieces to keep the magnification down and a bright image.


Very best,

Edited by MalVeauX, 23 September 2019 - 07:25 AM.

#3 Doug Culbertson

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Posted 23 September 2019 - 07:13 AM

Marty always gives good advice here, but I am using this 102 f/5 achromatic refractor  with this GSO focuser, atop this alt/az mount  with my Quark with great results. In my case, the refractor does double duty with a night vision device at night, so I wanted a faster focal ratio. 


FWIW, the price on the FLO website includes the VAT which is removed when you add it to your cart. 

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