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Lou took this great image of a prom with his Lunt152 double stacked with a Quark

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 26336 matches

by marktownley
Mon Nov 11, 2019 8:36 pm
Forum: Solar Scope Modifications
Topic: PST mod on a C14
Replies: 10
Views: 235

Re: PST mod on a C14

If you're happy with the results you're getting then all is good Andrew :)
by marktownley
Mon Nov 11, 2019 5:57 am
Forum: This is SolarChat !!
Topic: Sun in Ca II K - Bad seeing 20191110
Replies: 5
Views: 85

Re: Sun in Ca II K - Bad seeing 20191110

Some nice images there Stu. I'd consider stopping that big scope down this time of year, should sharpen things up a bit.
by marktownley
Sun Nov 10, 2019 6:22 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20191110) | Ha FD + Jet Transit
Replies: 4
Views: 170

Re: Today's SUN (20191110) | Ha FD + Jet Transit

You did well to get these Pedro
by marktownley
Sun Nov 10, 2019 12:15 pm
Forum: This is SolarChat !!
Topic: Enhancing filament detail
Replies: 8
Views: 145

Re: Enhancing filament detail

You're getting some nice results there Martin!
by marktownley
Sat Nov 09, 2019 12:36 pm
Forum: This is SolarChat !!
Topic: Mercury Transit 2016
Replies: 9
Views: 232

Re: Mercury Transit 2016

A nice record of the event Pedro
by marktownley
Fri Nov 08, 2019 9:52 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: large spectroheliograph - India
Replies: 5
Views: 127

Re: large spectroheliograph - India

I enjoyed the video JOhn
by marktownley
Fri Nov 08, 2019 9:50 pm
Forum: Solar Scope Modifications
Topic: PST mod on a C14
Replies: 10
Views: 235

Re: PST mod on a C14

f50 with air spaced etalons needs rather perfect seeing to say the least.
by marktownley
Thu Nov 07, 2019 6:27 am
Forum: This is SolarChat !!
Topic: Nov. 4,5,6 FD
Replies: 6
Views: 81

Re: Nov. 4,5,6 FD

Nice set of disks Phil!
by marktownley
Thu Nov 07, 2019 6:21 am
Forum: This is SolarChat !!
Topic: 2 Nov - 3-band FDs and zoom-ins
Replies: 10
Views: 166

Re: 2 Nov - 3-band FDs and zoom-ins

Nice shots Alfred!
by marktownley
Wed Nov 06, 2019 8:43 pm
Forum: Solar Scope Modifications
Topic: PST mod on a C14
Replies: 10
Views: 235

Re: PST mod on a C14

Hi At F28 you can remove the collimating lens from the front of the PST as its near enough to F-Infinity, or F40 for a air spaced etalon. The re-focusing lens will just about preserve the back focus from the PST. On a 127mm F7.5 with 2x ED Barlow element before PST with Collimating lens at the fron...
by marktownley
Wed Nov 06, 2019 8:30 pm
Forum: Solar Scope Modifications
Topic: PST mod on a C14
Replies: 10
Views: 235

Re: PST mod on a C14

You haven't got -200mm of back focus needed. Without using a larger ERF I would just use the setup on the 152 frac assuming it is f10.
by marktownley
Tue Nov 05, 2019 6:53 pm
Forum: This is SolarChat !!
Topic: Which etalon is better? Please, look, think and vote.
Replies: 12
Views: 375

Re: Which etalon is better? Please, look, think and vote.

How do you rate the etalons Valery?
by marktownley
Tue Nov 05, 2019 6:16 am
Forum: This is SolarChat !!
Topic: Anybody going to catch the Mercury Transit?
Replies: 22
Views: 330

Re: Anybody going to catch the Mercury Transit?

Incredibly unlikely...
by marktownley
Mon Nov 04, 2019 8:02 pm
Forum: This is SolarChat !!
Topic: 4th Nov Ha Sun
Replies: 6
Views: 115

Re: 4th Nov Ha Sun

That's great disk Robert! Glad the sun was shining in Skye for you!
by marktownley
Mon Nov 04, 2019 8:01 pm
Forum: This is SolarChat !!
Topic: Old school Solar observation | Clave' Helioscopes
Replies: 9
Views: 148

Re: Old school Solar observation | Clave' Helioscopes

Love all these old bits of kit you have Pedro!
by marktownley
Mon Nov 04, 2019 6:15 am
Forum: This is SolarChat !!
Topic: Sol from the 3rd of Novemaber 2019.
Replies: 7
Views: 118

Re: Sol from the 3rd of Novemaber 2019.

Nice disks Eric, especially with the volcano...
by marktownley
Mon Nov 04, 2019 6:13 am
Forum: This is SolarChat !!
Topic: Prom animation November 2nd
Replies: 8
Views: 136

Re: Prom animation November 2nd

Came out well and nice setup Franco!
by marktownley
Mon Nov 04, 2019 6:03 am
Forum: This is SolarChat !!
Topic: How to locate the Dust Bunnies
Replies: 6
Views: 130

Re: How to locate the Dust Bunnies

Those bunnies are on the chip Jack
by marktownley
Sun Nov 03, 2019 5:28 pm
Forum: This is SolarChat !!
Topic: 3rd November Images
Replies: 7
Views: 122

Re: 3rd November Images

Nice images Martin! Good capture of the active regions. That extra etalon is working well.
by marktownley
Sun Nov 03, 2019 2:15 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG caH cak
Replies: 17
Views: 309

Re: SHG caH cak

SHG is that's possible John?
by marktownley
Sun Nov 03, 2019 9:52 am
Forum: This is SolarChat !!
Topic: Sol from the 1st of November 2019.
Replies: 5
Views: 86

Re: Sol from the 1st of November 2019.

These turned out really well Eric.
by marktownley
Sun Nov 03, 2019 9:51 am
Forum: This is SolarChat !!
Topic: FDs and Highlights from Nov. 1st and 2nd
Replies: 6
Views: 103

Re: FDs and Highlights from Nov. 1st and 2nd

They're a great set of images there Phil, you're getting some cracking shots with the Lunt80.
by marktownley
Sun Nov 03, 2019 9:47 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG caH cak
Replies: 17
Views: 309

Re: SHG caH cak

Excellent addition. Do you have a Mg version John?
by marktownley
Sun Nov 03, 2019 7:46 am
Forum: Solar Scope Modifications
Topic: Common relectors for H-a?
Replies: 2
Views: 104

Re: Common relectors for H-a?

Sorry, it won't work. It will also cut transmission at the wavelength being observed. That's why erf's are needed for narrow band. Stripping the mirror only works for wide band observing in white light.
by marktownley
Sat Nov 02, 2019 10:10 am
Forum: This is SolarChat !!
Topic: Today's SUN (20190831) | QUARK Chromosphere
Replies: 31
Views: 714

Re: Today's SUN (20190831) | QUARK Chromosphere

It's not as straight forward as you think, a fraunhofer achro can often have better SA correction than a triplet, certainly so at shorter wavelengths. However, a triplet will have much higher Strehl at 540nm than an achro. Not all scopes are created equal either; a £8k TEC140 is going to be opticall...