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Does Focal Ratio affect brightness or is it all about field of view. Will an f/5 scope show the Andromeda galaxy more brightly in the eyepiece than an f/12 scope, or is it just about fitting Andromeda in there and seeing more of the sky? Also does the Focal Ratio of a scope have any effect on the amount or length of exposures taken in astrophotography? Thanks.
I have just joined and have been looking around, and putting in various searches to find the answer to my question(s).
I have already found some valuable information, but i can't find a specific answer to a question i have relating to exposure times.
I have shot the milky way several times before, from a tripod and a wide angle lens. I am aware of and understand the "500 rule" and that worked fine for me at first when i was shooting with my Canon 6D Mark II. When i moved over to the Sony A7III i noticed significant trailing using the same rule and that led me to the NPF rule (Via the photopills app incase people dot know).
I am heading back to Tenerife once again in about 6 weeks time and want to buy a star tracker so i can get some really detailed images.
I have done a fair bit of research and in principle, the whole thing doesn't seem to be too daunting or difficult.
I have purchased the Polar Scope Align Pro app so i can align Polaris as accurately as possible, i will practise putting the unit together and familiarising myself with the different parts etc, but it is the exposure times that i do not understand.
My best glass is the Carl Ziess 50mm F/1.4 Planar, the 18mm F/2.8 Batis, the Sigma 35mm F/1.4 Art & the IRIX 15mm F/2.4 Blackstone.
I currently do not own, nor have i ever used a tracker, and I cannot find any information relating to which aperture, ISO and Shutter length any of these focal lengths should or could be shot at.
Is there anything similar to the 500 rule or NPF rule that relates to using a tracker with varied focal lengths? or is it just a case of stepping the lens down for sharpness and then trial and error?
Thanks in advance,
Had a quick search but not found much info, I've just 'transitioned' from DSLR to a CMOS (AA 183C pro)
Used to capture with APT or Backyard Nikon, save as RAW, DSS to stack and use autosave.tif to work on in Photoshop. Whats the general consensus on CMOS ?
So far trying APT or Sharpcap, saving as FITS, stacking in DSS still and using autosave.tif into Photoshop. I keep seeing fits liberator mentioned ?
Opinions gratefully received.
I'm working on a school capstone project and decided I would try branching into astrophotography as observational astronomy has always interested me, but not so much astrophotography. Since I'm mostly concerned with observational astronomy, I just have an 8" alt-az manuel dobsonian, and I got an orion starshoot 2 camera just to try things out and see what I could image. I was wondering if it would be possible to get any detail out of a DSO if I were to take exposures in increments and move my telescope to center the object between exposures. Any otherimaging methods or object suggestions that I could image for my school project would be greatly appreciated. Thanks!
This is my first post here and I wish to introduce a little program i wrote.
This is a RAW to FITS batch converter. Converter supports many cameras vendors: Canon, Nikon, Pentax, Fuji, Konica, Hasselblad and so on.
May be useful for someone who shooting space with DSLR and wanna do a real science, search for variable stars for example.
Program is very simple (see attached screenshot), you just set input directory, output directory and few conversion options.
You can choose how to process color channels from the RAW file.
Possible options is:
- convert RGB to avarage grayscale
- store all three channels as separate images in a one FITS.
- store all three channels in a separate FITS's
- store only one selected channel
Converter supports multithreading conversion, depending on your cpu/cores count.
All data you entered in UI will store in FITS header. Some data (like exposure, date and camera model) may be acquired from the RAW file, this is preferable.
This is a free software licensed under GPLv2 license.
You can get it on github: https://github.com/olegkutkov/Raw2Fits
Program uses libraw library and i highly recommend to get latest stable version of this library instead of using your distro version. If you have multiple LibRaw versions on your system - please carefully check which version you linking and using in runtime. Correct Makefile if needed.
Libraw version older than 0.17 may not correctly extract EXIF data from the RAW files.
Also you will need cfitsio, any version is Ok.
User interface is built with GTK3 toolkit and tested with Gnome 3, Mate and Cinnamon DE on different Mint, Debian and Fedora distributions.
After executing 'sudo make install' command this program should appear in your Applications menu
Hope this program will be useful for someone.
I will be glad to hear your feedback, propositions and bug reports