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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.

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August 8 full disk with new toy

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Astrophil
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August 8 full disk with new toy

Post by Astrophil » Thu Aug 08, 2019 7:09 pm

Hi All,

A new toy arrived from Lunt Solar yesterday. An LS 80THa. I wanted a way to capture full disks easily and think this scope will suffice. The folks at Lunt were nice and very accommodating when I asked about a brighter blocking filter for photography. I ordered the B1800s straight through filter and they made two exchangeable tubes that attach to the main blocking filter. One for visual and a brighter one strictly for imaging. The single stacked LS80 needs the darker one but when double stacked the brighter one might be better. I haven't tried double stacking yet, but soon.

To my surprise, the morning after receiving the scope was clear and a chance for first light. Pressure tuning is new to me and will take time to get it right but it seems to produce a nicely illuminated disk. Today's images are more of a test and a chance to acquaint myself with the equipment. The setup included a PGR Grasshopper GX 6.0Mp camera (1" chip) and a 1.5x Barlow was used to fill the sensor. No mosaic, yea!

Phil
20190808_083053_LS80_ac.jpg
20190808_083053_LS80_ac.jpg (463.36 KiB) Viewed 377 times
20190808_081845_LS80_cd.jpg
20190808_081845_LS80_cd.jpg (493.55 KiB) Viewed 377 times
20190808_083053_LS80_invc.jpg
20190808_083053_LS80_invc.jpg (486.61 KiB) Viewed 377 times

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MAURITS
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Re: August 8 full disk with new toy

Post by MAURITS » Thu Aug 08, 2019 8:24 pm

Very nice and clean captures Phil.
Regards,
Maurits

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Re: August 8 full disk with new toy

Post by marktownley » Thu Aug 08, 2019 8:44 pm

Looks a winner to me!
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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: August 8 full disk with new toy

Post by ffellah » Thu Aug 08, 2019 9:19 pm

These are great, Phil.

Franco

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Re: August 8 full disk with new toy

Post by eroel » Thu Aug 08, 2019 9:36 pm

Phil:
Nice and clean even FD´s.
Regards,
Eric.

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Re: August 8 full disk with new toy

Post by Carbon60 » Fri Aug 09, 2019 7:29 am

Looks like a winning combination, Phil. Very nice FDs.

Some tips, if you are unfamiliar with the PT.

With my Lunt 60 PT I often boost gamma to max in order to produce a high contrast image and then tweak the pressure tuner to centralise the bright core of the image within the centre of the solar disk. I then reduce gamma to its normal level and check the image. A final tweak may be required just to ensure that the image is on-band across the entire disk.

When double stacking, often I find it better to get on-band first and the add the DS module and adjust that, ensuring that the ‘ghost’ image often seen is adjusted off to the side. It can be a bit of a juggling act between the PT, DS module and focus to get everything spot on.

Finally (maybe I should have started with this) owing to atmospheric pressure variation, I almost always start by unscrewing the PT (don’t remove it), just until I hear the slight hiss as the pressures are equalised. I then screw it fully in and work backwards to reach optimal tuning.

I’m sure others do things differently. :)

Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
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Re: August 8 full disk with new toy

Post by Montana » Fri Aug 09, 2019 9:27 am

These are fabulous full discs, looks like you have a very good full disc imaging kit :hamster: :bow

Alexandra

Astrophil
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Re: August 8 full disk with new toy

Post by Astrophil » Fri Aug 09, 2019 5:02 pm

Thank you all for the kind comments and the encouragement it brings. I do feel as if I'm late to the FD party but I have enjoyed the superb full disk images you all have posted.

Stu, thanks for the tips on pressure tuning. The decreasing pressure tuning is very helpful and more controllable. I'm holding off double stacking for as long as I can while gaining a little experience and hopefully by then there will be more solar activity to image. We'll see how long that lasts! I will try your other suggestions then.

Phil

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