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The Horsehead Nebula in Orion. This is one of the first deep space objects I saw in a book as a child and it captured my imagination - I’ve been intrigued by this incredible Universe ever since. As a small child, I’d have been blown away to think that 40 years later, I’d capture this image from my own backyard. I've only been astroimaging for less than a year so would appreciate any constructive comments/ criticism. Higher resolution version at: https://astrob.in/393553/0/
I tried something different with this image as I was severely restricted by time and conditions - battling last months full moon and a small cloud free window of about two hours each evening where the Horsehead appeared between some large trees and the edge of our house!
I took mainly Ha because of the moonlight but then blended in some Lum and Blue data to one master image. This brought out more detail in some of the nebulosity. The resulting Master was then processed through the red channel only in PixInsight and Photoshop:
Ha 36 x 240s
Lum 25 x 60s
Blue 20 x 60s
Scope: Altair 130ED Triplet
Mount: Celestron CGX
I own a Vixen ED-80 refractor which is used with a custom focuser by Telescope Service.
A Celestron f/6 SCT reducer corrector did not provide decent images either because it is not appropriate or because I did not maintain the correct distance.
I am thinking of buying the Sky-Watcher .85x Reducer/Flattener instead, as it is made for similar ED80 telescopes.
I do not know what is the correct distance of the SkyWatcher reducer for my setup and more important, I do not know if it will focus with the custom TS focuser.
Do you have any similar setup that you have used successfully?
I have a 4 year old Skywatcher NEQ6 mount that I control with a Synscan hand controller. Recently I have had trouble with the goto command not slewing to and finding the targets despite properly following polar alignment with polar scope followed by 2 or 3 star alignment. I have eliminated cone error, so do not think this is the cause. The RA and DEC motors run smoothly with not much noise. In attempting to understand the cause I noticed that if via the hand controller I slew the telescope by 12 hours in RA; the setting circle indicates that the telescope has slewed by 12 hours 20 minutes, which I can imagine could be a possible cause.
Does anyone know if it is possible to perform some sort of re-calibration of the Synscan hand controller to adjust the slewing so that it corresponds with the actual physical movement around the RA axis. I cannot see anywhere how to do this or why it may be out of calibration.
Thanks very much for any advice.
Mike (SW France, equipped with Celestron C11)
I have an EQ5 telescope mount which i use for astrophotography. I have modified it with a motorised RA axis using a bipolar stepper motor - my thread for the build is here .
I want to expand the mount's tracking ability by motorising the DEC axis and using a guide scope/camera. I generally use the mount in fairly remote locations so would like to use a raspberry Pi for portability.
I understand that I'll need to use a Raspberry Pi Camera Module for the guide camera.
The capability I want is:
1. guide the mount along RA and DEC axes using a guide star as feedback
2. track the mount using the RA axis only, and if possible continuously take 20-30 second exposures on the guide camera (this functionality is optional, but would assist in polar alignment of the mount)
I don't want any GOTO capability. I am very new to RPi and need some help:
- do I need to write code for this, or is there existing programming available for what I want to do?
- is it possible to avoid the use of screens (in the field)? My preferred option would be to flick a switch to start and stop the guiding, with another switch for alignment mode (or something simple like this).
- do I need to use any particular stepper motors/drivers for raspberry Pi? I'm using a bipolar stepper motor running quarter steps, with an A4988 stepper driver
- is the RPi 3 Model B+ the unit I should buy?