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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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

Search found 58 matches

by Rusted
Mon Nov 18, 2019 3:41 pm
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 2
Views: 26

Skywatcher DC Motor drive for PST etalon.

I don't want to hijack the present threads on motor driven, etalon tuning any more than I already have. Th builder's deserve the admiration of those of us who value their contribution to "hands-off" or remote imaging. My task is to drive the standard PST etalon adjustment band reliably using a Skywa...
by Rusted
Mon Nov 18, 2019 12:33 pm
Forum: Solar Scope Modifications
Topic: Motorized Etalon Tuners
Replies: 3
Views: 57

Re: Motorized Etalon Tuners

Congratulations on your neat execution. Being able to adjust these things without physically touching the telescope is a real boon. Probably one which is grossly underestimated by those who have never enjoyed such "remote control." With this facility, it often comes as a complete shock to discover h...
by Rusted
Sun Nov 17, 2019 3:16 pm
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 84

Re: Upgrade to the Vegemite etalon tuner

The mechanical advantage [ratio between the difference in diameters] should help.
If not, a larger radius is easily achievable by mounting a suitable ring on the PST Etalon band.
I'll be back! ;)
by Rusted
Sun Nov 17, 2019 7:27 am
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 84

Re: Upgrade to the Vegemite etalon tuner

Well done but, if you will forgive me for saying so, unnecessarily over-complicated. ;) This little motor happily drives my 3.5 FT focuser while vertical on my 180mm. It does so even with the hefty Lacerta 2" prism and ZWO camera attached. The toothed drive belt slips remarkably smoothly on the FT's...
by Rusted
Tue Nov 12, 2019 9:23 am
Forum: This is SolarChat !!
Topic: Sorry, another Mercury transit...
Replies: 15
Views: 167

Re: Sorry, another Mercury transit...

Your fine images nicely illustrate the sheer scale of the sun's surface texture compared with "tiny" Mercury.
From a similar viewpoint, the Earth would be just as utterly insignificant as [say] Venus in transit.
by Rusted
Tue Nov 05, 2019 10:55 am
Forum: This is SolarChat !!
Topic: PST no visual change when focusing
Replies: 3
Views: 138

Re: PST no visual change when focusing

Let's try to improve your chances of seeing something different. Other than a plain, blank, red disk: There's not much happening on the disk at the moment but that doesn't mean there is nothing at all to see: First step: Check Gong Ha [http://halpha.nso.edu/] website for clues as to where the main p...
by Rusted
Sun Nov 03, 2019 12:07 pm
Forum: Solar Scope Modifications
Topic: Common relectors for H-a?
Replies: 2
Views: 161

Re: Common relectors for H-a?

Thanks. I'd better cancel that order. ;-)
by Rusted
Sun Nov 03, 2019 7:12 am
Forum: Solar Scope Modifications
Topic: Common relectors for H-a?
Replies: 2
Views: 161

Common relectors for H-a?

I there was a specific solar filter foil, with slightly lower reflectivity than standard , we could routinely use much larger apertures for H-alpha at low cost . Our common reflectors could be used without the astronomical cost of full aperture D-ERFs. No need to strip our existing mirrors. With mos...
by Rusted
Sun Nov 03, 2019 6:40 am
Forum: This is SolarChat !!
Topic: Today's SUN (20190831) | QUARK Chromosphere
Replies: 31
Views: 802

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

Thank you for your useful responses.
by Rusted
Sat Nov 02, 2019 6:29 am
Forum: This is SolarChat !!
Topic: Today's SUN (20190831) | QUARK Chromosphere
Replies: 31
Views: 802

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

So the advantage of the higher quality of the APO lies mostly in its improved, spherical figure and more careful polish? Rather than its ability to bring more colours to the same focus.Which may not even include H-alpha in their prescription. It follows that a single, aspherical lens could replace t...
by Rusted
Fri Nov 01, 2019 6:23 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20190831) | QUARK Chromosphere
Replies: 31
Views: 802

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

Hi Pedro,

I greatly admire your images.

Some people say you don't need a high quality APO for solar H-alpha imaging because H-a is monochrome.

Even the camera is usually monochrome. So there is no chromatic aberration to spoil the image.

Would you agree?

Thanks
by Rusted
Sun Oct 27, 2019 3:57 pm
Forum: This is SolarChat !!
Topic: Interference eliminator and tilt adjuster
Replies: 23
Views: 413

Re: Interference eliminator and tilt adjuster

Apologies if your ZWO tilt plate adapter has socket head screws [like Pedro's top image]
Rather than the big thumbscrews shown in my image above.
I ordered ZWO but may have received a clone.

If this is the case then the system is identical but the screws just look different to mine.
by Rusted
Sun Oct 27, 2019 3:50 pm
Forum: This is SolarChat !!
Topic: Interference eliminator and tilt adjuster
Replies: 23
Views: 413

Re: Interference eliminator and tilt adjuster

I have the ZWO tilt adaptor and my brain physically cannot work out how to move it in any way. It always move the opposite way to what I want or is too tight to move, then you loosen it and you are back to square one. I have no idea in the slightest how to use it, I just don't understand the mechan...
by Rusted
Sun Oct 27, 2019 10:51 am
Forum: This is SolarChat !!
Topic: animation on our star on October 25
Replies: 11
Views: 199

Re: animation on our star on October 25

Superb animation!

The animations and images on your website are also amazing!
by Rusted
Sun Oct 27, 2019 10:44 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

The fire brigade has just left. <choke-cough> I'd left a cardboard stop ring in the dewshield of the 6". I had completely forgotten about it from Friday's battle with the clouds. The reflected return beam from the D-ERF had set it alight and acrid smoke had filled the observatory! Anyway, I fitted t...
by Rusted
Sat Oct 26, 2019 2:12 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Thanks Bart.

Sunny periods promised tomorrow.

I'll report back when I have compared the GPC x 160mm to the 120mm stop x 200mm.
by Rusted
Sat Oct 26, 2019 11:50 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

bart1805 wrote:
Sat Oct 26, 2019 11:25 am
If it it satisfies me is not so important, if it works is the question. Yes, this is perfect.
now find the minus 160mm spot and place the GP there. Good luck!
Thanks Bart.

How did we arrive at 160mm?
by Rusted
Sat Oct 26, 2019 11:12 am
Forum: This is SolarChat !!
Topic: Interference eliminator and tilt adjuster
Replies: 23
Views: 413

Re: Interference eliminator and tilt adjuster

The cheapest tilt plates with thumbscrews are awful IMO.
The push & pull thumbscrews are far too close together to allow easy adjustment.
I intended to fit mine with hex socket head screws so I can adjust the tilt with a long series hex key or hex driver.
by Rusted
Sat Oct 26, 2019 10:58 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

I hope the new GPC position satisfies Bart. First the AOK 2" nosepiece was bored to 28mm Ø in the lathe. This allowed the 'nose' of the GPC to pass through. The etalon now holds the GPC gently up against the inside of the AOK baffle using rubber washers for packing. Moving the washers under the GPC ...
by Rusted
Sat Oct 26, 2019 8:26 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Hi Whats the design back focal position of the Baader 1.25x Glasspath to give that magnification? Rod tested 2x Barlows at -200mm and they actually gave 4x. Have you measured the image size without and with the Glasspath? Andrew. Not yet. Heavy cloud for most of the afternoon made any real measurem...
by Rusted
Sat Oct 26, 2019 8:18 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Rusted, I don't understand what you are building. It is far more simple. Place the Glasspath really close to the front lens of the etalon. In a f/10 telescope you would place the front lens of the etalon 200mm before the focus point. In a f/8 with a 1.25x Glasspath you place it 160 mm before the or...
by Rusted
Fri Oct 25, 2019 5:06 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Meanwhile, back at the ranch: I tried the Baader 1:1.25 GPC in my 6" f/8 today. The focus was shifted 18cm away from its original position. I made no effort to move the etalon to match. But built instead a ridiculous and flexible length of multiple 2" Ø adapters to allow my ZWO 120MC to come to focu...
by Rusted
Fri Oct 25, 2019 4:47 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Hi Merlin, I had a good look but cant find it. Transmissions from memory were in the range 60-40%. Andrew Is it possible you are mistaken in thinking this was mentioned on CN? I am struggling to imagine any scenario where CN would tolerate such discussion. I was barred from the CN forum for daring ...
by Rusted
Thu Oct 24, 2019 2:46 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 587

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Hi Are you using a 2" red filter as an internal ERF? My friend used one and forgot to check after adding a Barlow and cracked a red filter. Still useable though as not at focus and seemed to have clear cover glass holding it together. There are various Solar discussions on CN. A review of front DER...
by Rusted
Wed Oct 23, 2019 5:24 pm
Forum: This is SolarChat !!
Topic: Importance of the image restoration in the solar imaging.
Replies: 41
Views: 1013

Re: Importance of the image restoration in the solar imaging.

But did you read the processing tutorial that goes with IMPPG? Solar imaging is the same as every form of astrophotography. The processing part is equally important as the actual gathering of raw images, some say it is more important. There is no absolute strategy, but with the pointers Alexandra g...