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Thread: Celestron 4SE Photography with Canon 500D

  1. #11
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    Default Re: Celestron 4SE Photography with Canon 500D



    Quote Originally Posted by goldstar View Post
    G'day Redbeard. There are two effects happening in the image. The occasional colored dots are "hot" pixels. They exist with any camera sensor these days. Nothing you can do about them except to process out using "dark" frames. The (free) DeepSkyStacker (DSS) software can do this job.
    The other effect looks to be the background wash of noise, the reddish cast seen. This is probably caused by the temperature of the camera.
    I guess it is wonderfully warm in Melbourne in late summer. Lucky you!
    There isn't much to be done about this either except to cool the camera which is not easy in itself.
    Nice first effort though.
    Hi!
    Cheers for that - that makes sense. Dam here I was thinking that the camera and scope had picked up what my eye couldn't see haha.
    The staked image tool - I've tried that and Deepsky staker tool. Never used anything like it before. Looks pretty cool - so it basically combines multiple images to create a single better image and then removes the various 'hot pixels' and what not? Thanks for the tip! Very helpful.

    Haha yeah it's still very warm in Melbourne at the moment - well it was last night anyway. I do look forward to winter where the sky is darker and the nights are cooler! I am very limited to what I can see in my back yard. It faces north and I have a small area that is visible to me. Although I do have a big park behind me that I might set up the scope in one evening!

    Going to look into getting one of those parfocal rings as well - will save me a bit of effort.
    I did buy the DSLR Controller app. Can't remember the last time I spend $10 on an app before haha. But it's pretty awesome being able to control the camera without touching it!

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    Default Re: Celestron 4SE Photography with Canon 500D

    Good on ya Greg. DSS does a great job but you will need more than just "lights".
    These are your basic images collected by the Canon in RAW (CR2) mode.
    To go with them you need to take "darks". They are very easy-you just cap off the scope or camera and take images of -well-nothing!
    If you take them at approximately the same temperature as the lights, the same exposure and ISO, they are used to subtract the noise and hot pixels.
    You can further improve things by taking "flats" and "bias" frames which will deal with vignetting, dust bunnies etc.
    This is all just processing with software. It doesn't need any special equipment, just what you have already.
    I recommend you read up on how to acquire them and there are many sites that will tell you how.
    You don't even need to take these frames live under the stars. Just snap away on the lights and enjoy a few hours of processing while you sleep.
    Good luck with it-you are on your way..
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    Default Re: Celestron 4SE Photography with Canon 500D

    Quote Originally Posted by goldstar View Post
    Good on ya Greg. DSS does a great job but you will need more than just "lights".
    These are your basic images collected by the Canon in RAW (CR2) mode.
    To go with them you need to take "darks". They are very easy-you just cap off the scope or camera and take images of -well-nothing!
    If you take them at approximately the same temperature as the lights, the same exposure and ISO, they are used to subtract the noise and hot pixels.
    You can further improve things by taking "flats" and "bias" frames which will deal with vignetting, dust bunnies etc.
    This is all just processing with software. It doesn't need any special equipment, just what you have already.
    I recommend you read up on how to acquire them and there are many sites that will tell you how.
    You don't even need to take these frames live under the stars. Just snap away on the lights and enjoy a few hours of processing while you sleep.
    Good luck with it-you are on your way..
    Oh interesting. Shows how much I know about astro-photography - I didn't know dark, light or bias frames were even terms! I'll give them a whirl tonight!

    Thanks again

    Cheers
    Hunt

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    Default Re: Celestron 4SE Photography with Canon 500D

    Parafocal ring. Instead of using a parafocal ring, you can use electrician's tape on the eyepiece barrel to mark the spot. Not as precise nor permanent but good enough for some usage, e.g. video cameras.
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    Default Re: Celestron 4SE Photography with Canon 500D

    Hi all.

    Not sure what I'm doing wrong but last night I went out and took some snaps and tried lifting out the eye piece until it was in focus as the camera was. I thought I'd have to lift it 5-10mm at most - but it was a good 10cm or so away from the telescope before it started to focus! So either I'm doing something wrong, or I need to make some sort of eye piece extension tube?

    Here's a pic of how it's set up. I'm using the Celestron T-Ring and adapter.

    https://drive.google.com/open?id=1nj...-_J1_4d9j2HOL5

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    Default Re: Celestron 4SE Photography with Canon 500D

    Yes, definitely looks like you will need an extension tube for the eyepiece and indeed about 10 cm of it.
    Just one damn thing after another with AP!

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    Default Re: Celestron 4SE Photography with Canon 500D

    Quote Originally Posted by goldstar View Post
    Yes, definitely looks like you will need an extension tube for the eyepiece and indeed about 10 cm of it.
    Just one damn thing after another with AP!
    Just did a quick test and it appears I actually only need to raise the eyepiece between 35-40mm. Is this a normal thing for the 4SE while using a Canon DSLR and T-Ring? Has anyone else had to do this?

    At this stage my telescope is looking more like a chain of adapters than anything else haha.

 

 
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