Astrofriend's homepage

www.astrofriend.eu
Share: Twitter Reddit Facebook Gmail Gmail Email
Search Astrofriend's homepage:

Valid CSS!

All pages shall now have been validated

Info Cookies (Kakor) / GDPR

Navigation

Advertisement /
Annons:

Advertisement / Annons:

Galaxy
Messier 101, Pinwheel Galaxy


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

M101 2021-02-15

M101 Pinwheel Galaxy, 2021 (click on the image to get a full resolution photo in a new window)
Date : 2021-02-15
Time (UT) : 21:31 to 23:14
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera off-axis
Lens/telescope : Pentax 645 300 mm ED f/4, external focus motor, Pentax 645 project page
Corrector/Barlow : -
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.

M101 2019-01-18

M101 Pinwheel Galaxy, 2019
Date : 2019-01-18
Time (UT) : 23:38 to 00:18
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera off-axis
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Field flattener 3" x1
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.

M101 2018-02-05

M101 Pinwheel Galaxy, 2018
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
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.

M101 2018-01-06, new setup with longer focal length

M101 Pinwheel Galaxy, 2018
Date : 2018-01-07
Time (UT) : 00:33 to 01:40
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera off-axis
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Field flattener 3" x1
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.

M101 2015-12-08

M101 Pinwheel Galaxy 2016
Date : 2015-12-08
Time (UT) : 00:17 to 01:25
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera off-axis
Lens/telescope : TS130, 910mm f/7 (682mm, f/5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
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.

M101 close up

M101 close up
Object : M101
Comment : Here is a zoom in on the M101, FOV about 25'x25'.
Go Back to content

Go Back

Advertisement / Annons: