Peter,
I agree.... if your seeing conditions can support the larger aperture.
Send me a 100mm H alpha scope and I’d love to test in the conditions down here at St Leonards on the Bay.....I’m 21 meters above the sea, 500mtr away.
The Meade/Coronado 90mm etalons look to be around $USD2500 each...but I can not recommend them.
My original Coronado (made in USA) etalon has significantly better performance (darker background and narrower bandpass) compared to my since added on Meade-Coronado (made in Mexico) Double Stack unit that came later.
DS with a BF30 you'd be looking at $USD6500 ...well over $10,000 Pacific Pesos with GST and shipping....
I suspect however that the days of $USD hegemony are coming to an end,
hence should the $AUD get beyond parity again, I'd be buying the Lunt 100mm in a heartbeat.
Peter,
Hmmm
I can't find any SME-90 filters in the US - In the UK they are shown as 2720bgp ($5400) - to get a DS double this cost!! Plus say a BF15 at us699 ($1000) Brings it in at around $11,800 http://www.meadeuk.com/Coronado-Etalon-Units.html
Thanks Ken, reading that thread it looks as if the Scout is not a good imaging choice. Am I right in that the Quark can be used on any decent achromat? I have a very nice 127mm iStar R30 f12 (which is an open tube TCR design, so likely no heat issues as long as you don't stick your finger in the Light path).
Thanks Ken, reading that thread it looks as if the Scout is not a good imaging choice. Am I right in that the Quark can be used on any decent achromat? I have a very nice 127mm iStar R30 f12 (which is an open tube TCR design, so likely no heat issues as long as you don't stick your finger in the Light path).
Yes you can use it on any scope you just need to add an uv filter on the diag nothing needed on the front
The Chromo Quark (the most popular version) has a built in x4 telecentric to provide the necessary f25/ f30 beam in "normal" telescopes.
Used in an f12 system the resulting f48 is OK optically but would limit the FOV dramatically.
An f5 to f8 scope is probably preferred.
By adding a x2 teleconvertor in front of the quark, you get around f24 which would be OK.
A minimum of a UV-IR cut filter as an ERF is recommended for apertures above 80mm and less than 120mm
See page 4: http://www.sunfield.ne.jp/~oshima/da...uarkManual.pdf
Above that aperture a full aperture ERF is recommended.
(Many of us use the Baader 35nm CCD filter as a sub-diameter ERF, gives superior energy reduction than the UV-IR cut and is optically identical to the highly recommended Baader D-ERF)
Hope this helps.
The Chromo Quark (the most popular version) has a built in x4 telecentric to provide the necessary f25/ f30 beam in "normal" telescopes.
Used in an f12 system the resulting f48 is OK optically but would limit the FOV dramatically.
An f5 to f8 scope is probably preferred.
By adding a x2 teleconvertor in front of the quark, you get around f24 which would be OK.
A minimum of a UV-IR cut filter as an ERF is recommended for apertures above 80mm and less than 120mm
See page 4: http://www.sunfield.ne.jp/~oshima/da...uarkManual.pdf
Above that aperture a full aperture ERF is recommended.
(Many of us use the Baader 35nm CCD filter as a sub-diameter ERF, gives superior energy reduction than the UV-IR cut and is optically identical to the highly recommended Baader D-ERF)
Hope this helps.
Yes Ken that does help. So a 2x Barlow (which I have) on my f12, is the go, along with an ERF (like the Baader). FOV would be limited I understand. Quark on the back, with camera. Thanks guys.
Glen,
Hmmmm, no.
You need a telecentric like the TV Powermates, or the ES/ Meade tele-extender. A conventional barlow will give possible problems with the back focus distance.
The Baader 35nm should be mounted on the front of the telecentric...
You bet mate I just pulled the trigger on a Daystar
and an asi290mm I don't even have to be outside now I can go inside with the ac running and image away happily in comfort
Does the Daystar quark need a front end filter on the telescope? If not I would be a bit worried about the sun's powerful rays wreaking havoc with the innards of the scope, no? I'm very ignorant with respect to solar stuff
Francisco,
The Quark is designed to work with all refractors.
No need for a front mounted ERF, but the use of an internal UV/IR is recommended for larger apertures.
I just pulled the trigger on a Daystar 
