New Astro Filter with Fujifilm X-T1

I played around a new filter with Fuji X-T1 daytime. These were all taken in CWB mode. So a camera doesn’t adjust the color balance internally.


No filter in CWB mode.


With VR3X filter.



VR3X result looks very similar to the one by a modified camera. But keep in mind, this doesn’t mean the camera is more capable of capturing Ha photon. Still same. These are all the relative color balance factors among R, G & B. In fact, each image data says VR3X image required 3 time slower shutter speed.

Since VR3x image too reddish like the modified one, I added HEUIBII in the optical train. As expected, it turns down to the normal finish. Looking good. I hope this will still help isolating the faint Ha region from the background color.

And I drew response curves by Fuji X-T1 (green lines). 50% at Ha is my guess, wish and feeling from my experiences comparing with other brands. If Canon is 25%, I felt like twice. I might be wrong. Just feeling. Questionable 60% is more wish. But at least Fuji’s S3Pro was 60% as the measured value at Ha. Also strictly speaking, I’m sure curve shape is not correct. Just take a look at them as my kinder-garden level rough sketch.


Fuji X-T1 with VR3X


Fuji X-T1 + VR3X + HEUIBII. Questionable part is if current X-mount cameras are similar to S3Pro.

Anyway, from these results, what I should set first to start will be at a bit higher ISO and twice (or 1.5x) longer exposure time. Then, I guess and hope the result might be close to the one by modified camera, and apply the dark and set dithered guiding by KODO controller to average the background. That’s the way to go!! I’m looking forward to this type of new experimental works.


~ by tedishikawa on June 21, 2018.

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