Demonstration of X-Trans Under-the-hood RAW Spatial (Noise) Filtering

tradesmith45 wrote:

TOMMMMMM wrote:

tradesmith45 wrote:

TOMMMMMM wrote:

Don't mean to hijack this thread, but I have both an X-A3 and an X-T2. I was wondering if anyone knows if the X-A3, with it's Bayer sensor, would be an improvement over the X-T2 for astro. Unfortunately, I won't have the opportunity to test this out any time soon, but it would be helpful to know for the next time I do get to go out.

Tom, it's not hard to check the A3. Take a 2-4 min. ISO 800-1600 dark frame (body cap on in dark room). Open the file w/ RAW Digger & look at the histogram. If there is filtering, the histogram will be chopped off or have steps. A dark frame from the T2 will show you what filtering looks like. Be sure to turn LENR off.

I'd offer to look at your file but am on the road for couple weeks.

Hey Tradesmith, never used Raw Digger before, but this is what I got from my X-A3 using ISO 1600 for 3 min exposure. To my eyes, it looks like there is no RAW filtering, but I'll let you chime in on that. Seems like a normal distribution of noise for a totally dark frame.

Glad you did this. The pixel values seem too high for a truly dark frame though. If you created the dark in a lit room, may have had slight light leak. Try this again with the cam in a dark room or dark enclosure.

If there is filtering it will only affect the lowest pixel values. That's why you have to use a truly dark.

I will try again but it will be hard to exceed shutter speed of 30 seconds without a shutter released, since 30 is the max before bulb mode needs to be set.

Even the Fuji camera remote app doesn't let you use bulbmode with this phone. Will 30 seconds suffice (since it's been mentioned that the filtering kicks in after 5 seconds), or do we need a 2-4 minute shutter speed as you recommended?