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Miquel Casas
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PDX Bortle 8 - Astrophotography - Gathering photons from LP skies...

I started the AP journey on 4/29/09. This is my first ever AP shot:

This blog page demonstrates images taken from a light polluted sky. It's a humble attempt to provide samples of the type of photography that can be done from less than ideal sky conditions (Bortle 8).

Still, I believe it's worth the challenge, as I live in Portland Downtown, my telescope gets used very often...obviously, when it's raining, I do lots of processing.

I would say that the image acquisition is not as hard given that I have permanent automated setup. I have about 28lbs of equipment on a 30lbs mount (obviously, I'm not following all the rules) which sits on a 455lbs steel pier, which sits on a 800lbs concrete block. All of this inside a roll-off-roof (ROR) observatory surrounded by beautiful PDX craftsman style houses. My neighbors are sensitive to my hobby, and they turn off their lights when they see the roof off.

Although my HEQ5 Pro mount is heavily loaded is pretty well balanced, and PEMPRO does wonderful things when it comes to Polar Alignment and PEC creation which I use for guiding with EQMOD.

Most of my imaging is between 40 degrees of altitude (due to the buildings) & 90 degrees...obviously, the closer to the zenith, the better to avoid LP (light pollution).

My processing is complicated given all the gradients and reflections of the sky, but amazing software like Pixinsight, Photoshop with Astronomy tools, GradientXTerminator, Noise ninja, etc can help distill the good photons from the bad ones...most of the time...

If you have any questions about how to take and process images in high LP skies, please, feel free to drop a question...Cheers, M.

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To avoid Spam and Bots, to join we simply ask you to describe your primary telescope setup.
Location: Portland Downtown, OR (Bortle 8)
Narrow Field: Orion Mak 150mm with QHY8L+ LPS IDAS
Wide Field: WO Lomo 480mm + TV.85 (FL=320mm) + QHY9M (Luminance LPS IDAS)
Guiding: ST80+SSAG

Miquel Casas's Blog

Eastern Veil - NGC6992 - HaRGB - Portland, Downtown (Bortle 8)

Posted on November 11, 2012 at 3:30pm 0 Comments

Another shot from beautiful Portland, OR.  Bortle 8 sky.


This time using using Ha as Luminance.


Ha: 110 min.
Red: 30min.
Green: 30min.
Blue: 30min.…

NGC6992 (HaLRGB) - Eastern Veil from Portland, OR Downtown (Bortle 8)

Posted on November 9, 2012 at 10:05pm 0 Comments

Enjoy this shot of the Eastern Veil...

Ha: 110min.

Luminance: 60min.

Red: 30min.

Green: 30min.

Blue: 30min.…


M45 - Pleiades

Posted on October 14, 2012 at 1:30am 0 Comments

Total Exposure: 3 hours 38min.

Red: 6 X 150 sec

Blue: 9 x 150 sec

Green: 6 x 150 sec

Luminance (LPS IDAS): 66 x 150 sec

Pixinsight & Photoshop for processing

Mount: HEQ5 Pro


Telescope: WO Lomo + TV 0.85 reducer (FL=380mm)

Imaging: QHY9M + LPS IDAS (Luminance)

Sensor temp: -15c

Location: Portland Downtown (Bortle: 8)…


IC5146 - Cocoon Nebula (Bortle 8 Sky - Portland Downtown)

Posted on August 24, 2012 at 1:30am 0 Comments

IC5146 Cocoon Nebula

Location: Portland Downtown, Bortle 8

Sky Conditions: Clear with new moon

Total Exposure: 9.6 hours. 233subsx150seconds over 4 nights

Adquisition: MaximDL

Focus: FocusMax

Guiding: ST80+SSAG+MaximDL+EQMOD+PEC

Processing: Pixinsight + PS4 + Astrotools

Mount/Telescope Equipment: HEQ5 Pro + Orion Mak 1800mm

Imaging: QHY8L CCD…


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At 3:27pm on June 29, 2011, Trevor Woodrow said…
Welcome Miquel!

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