Quark

[Peter Ward]

I've recently purchased a Quark to add to my H-alpha imaging system.

I'd appreciate feedback from quark owners who are also using 90mm or so aperture refractors....

Do you also use an energy rejection filter? or has heat build-up not been
a problem without one? (the manual says an 80mm limit...but who reads manuals :) )

[Merlin66]

Most users over on the SolarChat site add a UV-IR rejection filter for aperture less than 100mm...belt and braces.

[Marke]

Daystar says and most users follow the rule that you just need a uv/ir filter in front of the Quark up to 150mm . At 150 and over should use a front ERF
. I use mine with an 80 , 102 and 127 refactors with just a 2"uv/ir filter and no issues with heat at all.
I should add that if you have an oil spaced lens or rear elements thats a different matter.

[Peter Ward]

Thanks very much....UV/IR it is then :thumbsup:

[Marke]

Peter
The front ERF was more about reducing tube thermals in larger scopes rather than the risk of damage. :thumbsup:

[Merlin66]

Marke,
Just a correction...
ALL the manufactures of Petzval designed (rear element) scopes have confirmed in writing are 100% safe to use without an ERF.
They are all confirmed to be suitable for use with a Herschel wedge with no up front protection.

[Marke]

Thanks for that

[h0ughy]

Curious as to which one you got Peter?

[Peter Ward]

Ha prom Quark.

Interesting beastie...first light was late yesterday afternoon.

The field illumination is no where near as uniform as my front mounted etalons, but, that said I was impressed with the contrast...hence I'd pick one of these over a PST any day...sure a little more expensive, but better views IMHO.

It also double stacked well with the 90mm etalon...very contrasty! :thumbsup:

[FlashDrive]

I do hope you read your manuals .... ' checklist ' ....before departure and on finals ....:P

[Peter Ward]

:lol:

Have to say the A380 FCOM was a daunting document that familiarity with
was definitely required for continued employment ..but have to observe in retirement, I don't miss the hours of study before a Sim session in the slightest :)

[FlashDrive]

I'll bet .... when in doubt ... read the ' Manual ' ... again and again and again :rofl:
A Sim session ....I'll bet they throw up all sorts of ' scenarios ' at you ...!!:eyepop: ....little old lady walking down the runway right when your at v1 :lol:

[Peter Ward]

V1 cuts in the A380 were not too difficult......occasionally we had a little fun
in the Sim.... Such as flying a B747 under the Sydney Harbour bridge (it was a tight fit!). :whistle:

[FlashDrive]

Oh come on really...it's only a light twin ....;) ............. plenty of room..;)
I landed an ATR-72 on an Aircraft Carrier in FSX ...:thumbsup:

Sorry ...didn't mean to go off topic, I'll keep quiet now...!!:rolleyes:

[Peter Ward]

No probs....747 a light twin? Don't think so...but maybe if you had a double engine failure ;)

[Ukastronomer]

See my post here from a week back

http://www.iceinspace.com.au/forum/showthread.php?t=173759

[Ukastronomer]

http://www.iceinspace.com.au/forum/showthread.php?t=173759

And you don't need a front mounted ERF with an air spaced refractor of 120mm

-----------------------------------------------------------------------------------

Tiffany Messerschmidt <tiffany@daystarinstruments.com>
Wed, Feb 27, 10:46 PM (2 days ago)
to me

Jeremy,
It is correct to say a front mount ERF is not needed with a 120mm refractor.

It's difficult to figure out why you are not achieving focus without being there. What size/ style eyepiece are you using?

Tiffany

[Ukastronomer]

YOU are completely right

Daystar do NOT say you need a filter and you do not ONLY on oil spaced refractors Daystar clearly state this in leaflets and emails

----------------------------------------------------------------------------------

Tiffany Messerschmidt <tiffany@daystarinstruments.com>
Wed, Feb 27, 10:46 PM (2 days ago)
to me

Jeremy,
It is correct to say a front mount ERF is not needed with a 120mm refractor.

It's difficult to figure out why you are not achieving focus without being there. What size/ style eyepiece are you using?

Tiffany

[Ukastronomer]

:thumbsup::thumbsup::thumbsup: