Oldfield's Observation Log and Astronomy Topics
Welcome to my astronomy blog. I dedicate myself to the simplest form of amateur astronomy which requires only portable equipments. I have small refractors, small binoculars, a small mount, and a small H-alpha solar filter. Originally from a city where the people were proud of their light pollution, that is Hong Kong where I loved. Relocated to the UK since 2021.
Thursday, October 08, 2026
20261007 The Double Cluster NGC 869 + NGC 884 and Comet 161P
Wednesday, October 07, 2026
20261006 IC 5146 Cocoon Nebula (again ) and also Coat Hanger
The sky was no good for the whole day, but it's clearing up so why not give it a run?
Let's try again and hopefully got more photons this time:
Stacking failed after around 1.5 hours.
So I switched to the coat hanger for a small mosaic, this one is interesting visually and the S30 could capture it via stitching:
Lovely, 46 minutes of total exposure.
Tuesday, October 06, 2026
New solar observation tool
I ordered a pair of 58mm solar filter for my Canon 18x50mm IS.
I choose glass filters instead of Baader film, since I want them to last longer.
My thousand oaks solar filter still survive after nearly 30 years of services!
I'm glad to have a chance to test them out this morning. Despite there are quite many clouds floating around, I got some really nice views. Sunspots were clear, with quite a lot of detail within!
The nice optics of the Canon 18x50 IS definitely shows a lot. With two eyes, it certainly helps, too. The image stablisation works wonder at 18x, it's just so convenient and powerful.
I've also ordered a herschel wedge for my refractor.
I shall test it later, and if it is good, I might import some more to the local market.
Saturday, October 03, 2026
20261002 IC 5146 Cocoon Nebula
It has been raining crazily.
The floor is still wet but the sky clear up suddenly.
Setting up the S30 is no brainer, the best part of this little piece of equipment.
It's 20:56 now, and exposure should begin before 21:00, I still have 1.5 hour of exposure hopefully.
After around 30 minutes of exposure, it rains. I didn't realise until stacking failure was reported. I pulled the S30 inside and use a fan to dry it, hopefully it's not soaked yet.
I should try this target again later.
Friday, October 02, 2026
20261001 IC1318 with NGC 6910
Will be spending the whole session on it, hopefully get more than an hour of exposure.
Finally more than two hours, 2:14 to be exact:
Quite many nebulosity. I'm going to do more of these, I mean to work on a single target per session.
I shall also bring out my 6D with my 200mm lens to take even wider field of view. Time to explore the potential of non-cooled imaging.
Thursday, October 01, 2026
20260930 The Elephant's Trunk Nebula (IC 1396A) by S30
I am doing mosaic with 2x to maximise the field of view, started at around 9:00pm.
Transparency maybe 5-6/10.
See how long exposure I could get.
Total for 46 minutes, failed to finish the whole mosaic, the nebula is not very visible:
Thursday, September 24, 2026
20260923 Messier Hunting Pause, Capturing Best targets of the night
No more new target could be acquired tonight.
C27 will be my first target, the Crescent Nebula:
40 minutes of exposure.
I also setup my 85mm refractor looking at the moon and also scan around with my daughter Almy.








