RGBOOH of the tadpoles and IC410

A place to share images that you have taken with SharpCap.
Forum rules
Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.

Please share the equipment used and if possible camera settings to help others.
Post Reply
timh
Posts: 515
Joined: Mon Aug 26, 2019 5:50 pm

RGBOOH of the tadpoles and IC410

#1

Post by timh »

SW200PDS Newtonian (f = 1000mm, F5.0) Baader MkIII coma corrector, CEM70 Ioptron mount, Baader steeltrack focuser, Pegasus Cube2 focus controller, PHD2 guiding using an ASI 120 mm guide camera and 80 mm SW startravel refractor at f = 400 mm.

ZWO AS1294 MC camera for RGB (UHC) captures or ZWO ASI294MM mono camera for HA and OIII , both 4.63 uM pixels cooled to -10C

ZWO IR/UV cut filter, Astronomik UHC filter , Astronomik 6.0 nm OIII filter, Optolong HA 7 nm filter

Most of the OIII and HA frames on 5 th and 7 th January 2022. RGB (UHC) frames 7 February 2021.

124 x 70s RGB (UHC) frames at gain 124 and 62 x 3min gain 151 OIII under moonless Bortle 6 skies. 66 x 3 min HA frames captured with the moon risen but low in the SW sky

All frames (0.95 AS/ pixel) pre-selected for quality using the FWHM and brightness filter within Sharpcap, darks and grayscale master flats (no bias) prepared using Sharpcap. 3.0 h HA and O3 images taken using a mono camera were combined into a narrowband OOHa image of IC410 at F 5.0, f = 1000 mm. The NB image was built using PI pixmath with red 100% HA, green 100% O3 and blue 10% HA plus 90% O3. RGB from a 2.3 h OSC camera image taken through a UHC filter was then added to the NB image using the PIxmath max function. With careful adjustment of coefficients mainly only the (correct colour) stars were carried over from the RGB into the combined image. To improve detail HA was then used as luminance for the combined NB and RGB image with curves and Affinity used to adjust the final stretch. The use of HA luminance also serves to reduce the impact of the stars. Capture was with Sharpcap and preprocessing plus processing (background removal, noise reduction, photometric colour calibration and curves) was carried out using PixInsight.

Lots of horrible problems with the Newt this Jan ..one night lost to poor guiding (RA wobble - fixed by increasing pierside weighting to keep RA enmeshed, frost and dew build up on the mirrors and then poor guiding due to wind) ..but managed to get this image so OK in the end.

Just the central part is shown here..I like the deep view of the centre/ tadpole area ....the full image is on Astrobin

https://www.astrobin.com/n9ouiy/0/

Tim
Attachments
aa_minitadpoles.jpg
aa_minitadpoles.jpg (904.13 KiB) Viewed 1135 times
Post Reply