Archive for the “Writing” Category

Peter Rusling has also used one of the Amazon supplied light panels for taking flats.  He says:

“I’ve bought one of these excellent panels and thought I’d share that the light USB L4S version will mount safely on a £15 articulated TV arm in an obsy using Velcro. This allows me to position it up against either of my scopes and has the added bonus of providing an observatory light (albeit white) when stowed against the wall.”

A picture of Peter’s setup is shown below.

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I have decided that the image for this month is the one you can see below – the very deep Canon 200mm prime lens single-framer of Cassiopeia from the Gamma Cass nebula (IC59/63) all the way down to the PacMan nebula.  Although the nebulosity is nothing to write home about – the star field came out very nicely.  And this got me thinking (always bad) – I now need to see how narrowband filters perform on this rig, so it is possible (if I get the weather) that this Image of the Month will also appear as a couple more images of the month as I add in some narrowband data.

I have incorporated narrowband data into earlier RGB work using the Sky 90 and M25C camera.  Images include, the whole of the Veil nebula, the Horsehead nebula region, the M42 region, the Jellyfish nebula region, the IC1396 region, and finally I added some H-alpha data to the M31 image to bring out the emission nebula regions in that galaxy.

 

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From two  nights ago here is a single-framer using the 200mm lenses and the Trius M26Cs of the region in Cassiopeia running from the star Navi all the way down to the PacMan nebula.  This is 21 subs at 15-minutes per sub.

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This is just 10 x 15-minute subs using the Canon 200mm prime lenses and the Trius M26C 10-megapixel OSC CCDs from last night (30/08/2016).

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Last night I got the top 2 frames of an image I started last year.  This is the central region of Lyra taken using the Canon 200mm prime lenses and Trius M26C OSC CCDs.  I have deliberately accentuated the contrast showing the “dark lanes” running through the region and I am in the process of checking that they correspond to the dark lanes seen by other imagers who have taken wide fields of the same region.

This is the first 4-frame mosaic taken with the Canon 200mm lenses.

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A while back I asked for submissions to run a deep-sky image of the week from this site. The response was not good. In which case I will post up a deep-sky image of the week from my own collection. I’ll kick off with this recent very wide field of the Cocoon region taken with the 2 x Canon 200mm lenses and the Trius M26C OSC CCDs.

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Another clear night last night – what is going on??  Fired up the miniWASP array, this time using the 2 x Canon 200mm prime lenses and the Trius M26C 10-Megapixel OSC CCDs.  Target – the rich Milky Way region in Lacerta.  I was originally going to take a 2-framer of this region JUST showing a huge star density, but when I looked at the region on a planetarium program I saw that this was not a good choice.  If I took the frame to the right, rather than to the left – then instead of just having a mass of stars, I would also get a pile of dark nebulosity as well as the Cocoon nebula.  So I took the right hand frame.  Left hand frame was 16 x 10-minute subs and right hand frame was 14 x 10-minute subs, so a total exposure time of 5-hours but with only 2 and a half hours of actual (real) imaging time.  Registar says there are 250,000 stars in this image.

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Having swapped out the Master Computer and mucked around a bit with Sky 90(1) I had some clear sky last night to take some test shots to see what needs fine tuning.  This image is just 12 x 5-minute subs with the array.  I now know that I need to very slightly flatten the Sky 90(1) chip and I need to re-align Sky 90(2) and Sky 90(3) to Sky 90(1).  Then the Sky 90 array will be ready for the new season.  The Canon 200mm DSLR array is of course fine and needs no attention!!  I wish now that I had built the whole array out of Canon 200mm lenses – live and learn 🙂

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Most of the 6-minute pass at 11:11 p.m. last night.

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I have recently finished the Second Edition of the Springer publication “Making Beautiful Deep-Sky Images” and it has been sent off to them to make bookworthy.  Springer then sends me back the draft (with all the page numbers) and I then have the final (mind-destroying) job of putting the Index together.  You will see the new 2nd Edition in the shops next year (I’ll let you know when) and if you have the 1st Edition, there’s enough new stuff in the 2nd Edition (including completely new chapters, and completely re-written old chapters) to warrant raiding your wallets for a second time.  The biggest change you will see on the front cover is the removal of the sub-title “Astrophotography with Affordable Equipment and Software” – with a chapter dedicated to the New Forest Observatory mini-WASP Array – some of the equipment is now anything but affordable.

 

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