| Object : | M101, Pinwheel galaxy |
| Coordinates/Direction : | RA: 14h03m, DEC: +54o20' |
| Object size : | 28.8' x 26.9' |
| Object magnitude : | 7.8 |
| More to know : |
Wikipedia:
https://en.wikipedia.org/ wiki/ Pinwheel Galaxy |
| Date : | 2023-02-27 |
| Time (UT) : | 20:25 to 21:04 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and KStars Ekos/Indi |
| Guide : | Ekos internal guider in dithering mode, QHY5 camera with 200 mm f/3.5 lens |
| Lens/telescope : | Pentax 645 300 mm ED f/4, external focus motor,
Pentax 645 project page |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D, controlled byKStars Ekos/Indi |
| Film/CCD : | Raw |
| Exp. time : | 30x60 seconds, iso1600 |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | resize, level, cal dark&flat |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
In February there are not so many exiting objects to observe from our balcony.
It's the old friend M101 who is in focus again. |
| Date : | 2023-02-27 |
| Time (UT) : | 20:25 to 21:04 |
| Comment : |
What to say, I need a bigger telescope and lot of exposure times. |
| Date : | 2021-02-15 |
| Time (UT) : | 21:31 to 23:14 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and APT |
| Guide : | PHD2in dithering mode and guide telescope 400 mm f/6.3 QHY5 |
| Lens/telescope : | Pentax 645 300 mm ED f/4, external focus motor,
Pentax 645 project page |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D, controlled by APT |
| Film/CCD : | Raw |
| Exp. time : | 92x30 seconds, iso800 |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | resize, level, cal dark&bias, no flat cal |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
This is first light with my new Pentax medium format 300 mm lens.
To be that old it's relative advanced with its ED lenses and have a good reputation of quality.
The galaxy isn't easy to see.
Click on the image to get a full size image of it.
Look at the corners and how it focus the stars.
Looks very good but at the upper left corner the stars are a bit elongated.
The galaxy is the little weak blob at center. At f/4 it collect photons much quicker than my f/7 telescope.
About three times, 45 minutes exposure with this lens correspond to140 minutes with the telescope.
This time I didn't flat filed correct the image.
It takes some time for me to make a correct master Flat for this new lens.
But this lens has very low vignetting even when used on a full frame camera, that is the idea behind to use medium format lenses.
This old lens is a wonderful set of glasses, this will be my standard lens in the future at the 300 mm range. |
| Date : | 2019-01-18 |
| Time (UT) : | 23:38 to 00:18 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and APT |
| Guide : | PHD2in dithering mode and guide telescope 400 mm f/6.3 QHY5 |
| Lens/telescope : | TS130, 910mm f/7 |
| Corrector/Barlow : | Field flattener 3" x1 |
| Field (FOV) : | 2.25x1.5 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D, controlled by APT |
| Film/CCD : | Raw |
| Exp. time : | 60x30 seconds, iso1600 |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | resize, level, cal dark&bias |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
Little bit better but still need a lot more exposure. The problem the limited free view from my balcony don't let me take enough photos. |
| Date : | 2018-02-05 |
| Time (UT) : | 21:29 to 22:25 |
| Mount : | EQ6 controlled by EQMOD |
| Guide : | PHD2 in dithering mode and QHY5 camera, guide telescope 400 mm f/6.3 |
| Lens/telescope : | TS130, 910mm f/7 |
| Corrector/Barlow : | Field flattener 3" x1 |
| Field (FOV) : | 2.25x1.5 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D |
| Film/CCD : | Raw |
| Exp. time : | 57x30 seconds, iso800 |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | resize, level, cal dark&bias |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
This photo has to much noise because it's only a 7.8 magnitude galaxy.
More exposure next time needed. |
| Date : | 2018-01-07 |
| Time (UT) : | 00:33 to 01:40 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and APT |
| Guide : | PHD2in dithering mode and guide telescope 400 mm f/6.3 QHY5 |
| Lens/telescope : | TS130, 910mm f/7 |
| Corrector/Barlow : | Field flattener 3" x1 |
| Field (FOV) : | 2.25x1.5 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D |
| Film/CCD : | Raw |
| Exp. time : | 46x60 seconds, iso800 |
| Image process tool : | AstroImageJ, Fitswork, Irfanview |
| Processing : | resize, level, cal dark&bias |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
This photo has to much noise because it's only a 7.8 magnitude galaxy.
More exposure next time needed. |
| Date : | 2015-12-08 |
| Time (UT) : | 00:17 to 01:25 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and APT |
| Guide : | PHD2in dithering mode and off axis guide QHY5 |
| Lens/telescope : | TS130, 910mm f/7 (682mm, f/5.3) |
| Corrector/Barlow : | Riccardi flat field corrector 2.5" x0.75 |
| Field (FOV) : | 3x2 degree, before cropping |
| Filter : | none |
| camera : | Canon 6D |
| Film/CCD : | Raw |
| Exp. time : | 31x120 seconds, iso800 |
| Image process tool : | DSS, Fitswork, Irfanview |
| Processing : | resize, level, cal dark&bias flat |
| Weather : | clear |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
This photo has to much noise because it's only a 7.8 magnitude galaxy.
More exposure next time needed. |
| Object : | M101
|
| Comment : |
Here is a zoom in on the M101, FOV about 25'x25'. |
English
(click on the image to get a full resolution photo in a new window)
(click on the image to get a full resolution photo in a new window)
