Swansea Astronomical Society Blog

Saturday, July 13, 2013

28% full, waxing, crescent Moon

A Pentax K-x DSLR was directly connected via a T ring at the prime focus of an f/5, 6" Newtonian.
The camera was set to ISO 100 and 1/100s exposure and 25 exposures were made in RAW format. The images were stacked in Registax 5 to produce the final image. Click on the image to get a larger view:

Steve Wainwright

posted by astroimager  # 11:33 PM 0 Comments

Friday, July 12, 2013

A setting 19% waxing, crescent Moon

A Tripod mounted Pentax K-x DSLR fitted with an f/8, 500mm mirror lens was set to ISO 400 and 1.3s exposure and the setting Mon was imaged. Click on the image to get a larger view:

Steve Wainwright

posted by astroimager  # 11:11 PM 0 Comments

Saturn

This image was taken through an 11” Celestron SCT, using a DBK21 camera and a 1.5x barlow. The 4000 frames were processed in Registax 5, and the best 1250 were stacked. Andrew Sprott’s CAP program was used to align the three colour channels, removing atmospheric dispersion.

 

 

Keith Davies

posted by astroimager  # 8:20 AM 0 Comments

Thursday, July 11, 2013

Moonset

A tripod mounted Pentax K-x DSLR fitted with a 500mm mirror lens was used to image the setting 12% full, waxing crescent Moon. The camera was set to ISO100 and 0.5s exposure. Click on the image to get a larger view.

Steve Wainwright

posted by astroimager  # 11:23 PM 1 Comments

The Sun in H-alpha and Ca K-line light

A DMK21AS camera fitted with a 2.5x Barlow was attached to a Solarmax ll 60 BF15 H-alpha scope. A 10,000 frame AVI was captured of the AR1785 - AR1787 regieon of the solar disk. The AVI was processed in Registax 6 and the best 20% of the frames were stacked to produce the final image. Click on an image to get a larger view.

The region was crackling with activity
Four, 5,000 frame AVIs were captured at prime focus, of overlapping quadrants of the solar disk and were processed in Registax. The resulting images were combined into a single image of the whole disk:

Four, 5,000 frame AVIs were captured at prime focus, of overlapping quadrants of the solar disk using a CaK PST solar scope and were processed in Registax. The resulting images were combined into a single image of the whole disk:

Thge H-alpha and the Ca K-line images were registered and merged into a single image that shows the structures visible at both wavelengths:

Steve Wainwright

posted by astroimager  # 8:42 PM 0 Comments

Solar imaging with DSLR AVI capture

A Pentax K-x was placed at the prime focus of a 127mm, f/10 Maksutov fitted with a photographic grade Baader solar filter. The camera was set to live mode and the live image was zoomed to facilitate focusing on the sunspots. The camera was set to video capture at a resolution of 1280 x 720 at the highest quality settings. Three AVIs were captured, joined together in VirtualDub and saved as a single AVI. The AVI was processed in Registax 6, using about 6000 frames. Click on the image to get a larger view.



This proved to be a rapid and convenient way of recording most of the solar disk.
It should be noted that Photographic grade Baader filter is NOT SAFE for visual use. The Sun was positioned using an eyepiece fitted with double stacked 13% ND filters in addition to the Baader filter.

Steve Wainwright

posted by astroimager  # 12:17 PM 0 Comments

Wednesday, July 10, 2013

M13 and M27 with a little tracking error

The globular cluster, M13 and the planetary nebula, M27 were imaged through a wedge-mounted 6" SCT using an Orion Starshoot camera.

M13

M27

 

 

Colin Miles

posted by astroimager  # 2:11 AM 0 Comments

Tuesday, July 9, 2013

More DSLR experiments with the Sun and an 8" SCT

A Pentax K-x DSLR set to ISO 400 and 1/2500s was placed at the prime focus of an f/10, 8" SCT fitted with a Kendrick Baader solar filter. Twenty RAW images were captured in rapid succession and were processed in Registax 5. South is top-right in the image. Click on an image to get a larger view:

Look back through the blog and the blog archive to see other examples of solar imaging by other techniques.

Steve Wainwright

posted by astroimager  # 10:33 AM 0 Comments

Saturn with the SAS 8" SCT

A DFK21AS camera was fitted with a 2.5x Barlow was attached to the SAS 8" SCT and a 4000 frame AVI was captured of Saturn at 15fps. The AVI was processed in Registax to produce the final image:

Steve Wainwright

posted by astroimager  # 12:38 AM 0 Comments

Monday, July 8, 2013

Sunspots, an 8" SCT and a DSLR

Experimenting today with the Swansea Astronomical Society's f/10, 8" SCT fitted with a Kendrick Baader solar filter and a Pentax K-x DSLR. The experiment was to compare a single image of the Sun taken at prime focus, with a stack of 31 images. The stacked images were 21 at 1/1250s, ISO 400 and 10 at 1/1250s, ISO 2002. The Single image was at 1/1250s and ISO400. Click on an image to get a larger view. In these images, south is at the top:

Single image:

Stacked images

 

 

The stacked images show a little more detail, but the single frames show a surprising amount of detail by comparison.

 

Steve Wainwright

posted by astroimager  # 6:38 PM 0 Comments

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