sharkmelley

By clip in filter I assume you mean a temporary filter that you insert into the camera body rather than a permanent replacement filter. If so, then the clip in filter makes no difference because ...

Very interesting.  I've just looked on LifePixel's site and found that the A7II and A7III do not have a warning about any potential IR leak after conversion. On the other hand the A7RII, A7RIII and ...

Hi and welcome to DPReview! That's an excellent result! The colours in the Milky Way look very natural. Very well processed. I am intrigued about the conversion of your A7III camera. It has been ...

It's the kind of question to which you might get many different answers, so here is my own view on this. I use a 224MC on an SCT with barlow and an atmospheric dispersion corrector.  This gives ...

Exactly.  Just to be absolutely clear for the OP, an astronomical IR cut filter is required - it lets all the H-alpha pass through but cuts the IR beyond. Mark

Unfortunately it isn't easy because of the limitations of DBE.  The only way to look at the histograms is to look at the resulting background-subtracted image that DBE generates.  The best way to ...

My own quick sanity check suggests your estimate is a long way out.  By the inverse square law, each doubling of distance makes a star 4x dimmer, i.e. approx 1.5 mags dimmer. You need to double the ...

When you have a mixture of landscape and light polluted sky then things become more complicated. You need to subtract a light pollution gradient from the sky but not from the landscape. This is ...

Sure, my intention is not to confuse readers. Without doubt, black point errors are by far the biggest issue because they can turn both reddish stars and orange dust to blue. Without doubt, your ...

Once we are agreed that light pollution needs to be subtracted, there's still no easy way to deal with it. But I will say this: if you open your raw image in Photoshop with its default settings, ...

I'm interested by that comment. What evidence do we have that blue sky is often near or outside the gamut of sRGB and Adobe RGB? Mark

Excellent result!  I love the full res version. Mark

Very impressive.  It certainly reveals the structure in the nebulosity. Mark

As promised, I've done a couple of plots, now I've worked out how to determine the pixel colours. Firstly the histogram of an X-T3 long exposure dark: The Y-axis is logarithmic to show some of the ...

Yes the XT100 is definitely subtracting well. BTW, are these pictures crops at 100% scale?  I trying to work out how many sensor pixels are occupied by each of your dots.  Ideally you want them as ...

That's a very interesting set of results.  I'm looking forward to your further progress. Mark

That should work! Use a darkened room if you can, to avoid stray reflections. Mark

I haven't seen the article in question.    However, my analysis of dark exposures kindly sent to me shows that the raw data filtering is taking all 24 neighbours of a pixel into account when ...

Please ignore my hasty analysis above.  The graph is correct but my analysis was faulty.  A graph of real world astro-image coming from an unfiltered camera looks very similar to the plot above, so ...

I took a look at the first image.  It displays classic spatial filtering: Pixel values are very clearly being truncated back to close to the maximum of their neighbours.  But this is a very quick ...