IS there a source that says you can use the PST filter with the DayStar?
The DayStar is .5 A bandpass which is what PST claims the double stack achieves. I do doubt that it can be threaded on. It is supposed to be attached to the objective lens? I can say that the 50mm objective that SLAS has used with the Daystar has no way to attach anything to the objective. Hi Kurt,
There's a double stack Coronado and the DayStar at SPOC. Maybe next time you're out there for a star party we could see how to fit things together.
patrick
On 26 Jun 2010, at 17:54, Canopus56 wrote:
I understand any solarscope can be double stacked assuming you can match the thread and aperture sizes on the objective of SLAS daystar scope. By pre-filtering the light, you can a narrower angstrom bandpass.
I have a Coronado double-stack add on filter for the PST 40mm scope. If it matches the SLAS daystar objective, you are welcomed to borrow it. I'll have to measure the thread size and get back to you.
I suggest finding and posting the thread and aperture size measurements taken from the daystar scope objective. Someone in the club is likely to have a match.
http://www.slas.us/gallery2/main.php?g2_itemId=3298 http://www.optcorp.com/product.aspx?pid=6665 http://www.coronadofilters.com/doublestack/doublestack.html
with respect to the performance, I have only preliminarily used the PST in double stack mode. My initial impression was that it significantly increased the ability of telescope to resolve Ha detail on the Sun's disk. It seemed to reduce the small PST's ability to focus in prominence's on the solar limb.
After the double stack lens is attached to the scope, by turning the brass dial knob on the lens's body, several offset images of the Sun are seen the in eyepiece. The main solar scope tuning knob, the tuning knob on the double stack, and the offset of the parafocal disk of the objective are then played with until all the multiple solar images "register" with each other. Then the image will have maximum resolved detail. There is considerably more "tweaking" time in using a double stacked scope as compared to a single stack. But my setup is at a low-end price point. Other club members with the "real" $3-$5K double stacked 90mm+ SolarMax and Lundt scopes may have other perspectives to contribute.
Regards, Kurt
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com