sharkmelley

I think it's a gimmick and if anything it might actually increase interest in the night sky. But far more worrying is the Chinese plan: https://www.theguardian.com/science/2018/oct/17/chinese-city- ...

Pink is quite normal for hydrogen emission nebulae. Take a look at Roger's excellent article here: http://www.clarkvision.com/articles/color.of.nebulae.and.interstellar.dust/ Also take a look at ...

I agree. I think the colour saturation is caused by subtracting light pollution from non-linear data. But I don't really want to re-start that argument again ;-) Mark

Agreed. It certainly does look like the effects of the spatial filtering. I like the idea of performing a test pointing at Polaris, to minimise star trailing. Mark

Congratulations!  That is certainly a stunning image. Mark

Wow!  That is really impressive.  Loads of detail. Mark

Interesting.  I wasn't aware of this.  I wonder what's going on? Mark

Yes, it is very difficult to collimate the Epsilon with sufficient accuracy and many people give up and sell it on. How do I know? Because I often get emails from people asking advice on how to ...

Great example!  It's a good demonstration of the effects. Thanks for posting this. Mark

Thinking about it some more I agree with you.  You don't need perfect tracking to use pixel shift. Mark

If I'm interpreting your results correctly, the image of each dot covers multiple sensor pixels. But instead, the camera needs to be far away enough that the dots on the monitor have a chance of ...

I like that!  It's full of interesting objects and dust. Mark

That's exactly right. Dithering will average out the colour differences when there is no spatial filtering and the resulting average will be the correct star colour. There is no dithering and/or ...

I agree with all your points. Mark

The only other point worth making is that you need sub-pixel accuracy in your tracking for this to work effectively. Mark

Thanks for posting this example.  It's a useful counterpoint to the example in the original post. Mark

Some quick facts: The spatial filtering used on the A7RIII is the same as that used with firmware version 4.0 on the A7RII. However, the A7RII workaround using Continuous mode does not work on the ...

I use the word mitigate in the sense of making an issue less severe. Pixel shifting certainly won't fix the issue. In the case of the crude Sony algorithm used on the Mk2 and Mk3 cameras, the ...

The spatial filtering causes the worst damage to undersampled stars. In the first case your periodic error will tend to smear the star over a few pixels and make it less likely that it will be ...

Yes, it will work - In fact I've actually done this in PixInsight.  Choose the same reference image for the Canon stack and Nikon stack.  I would stack them separately so you can give each stack ...