My setup is as follows:
full spectrum D7200,
rokinon 35mm 1.4 with hoya uv/ir cut for astro (same filter as astro mod) and hoya red intensifier for LP. Focal length on crop is 52mm. Aperture set to F/4
I’ve been wanting to do a portrait of orion ever since I started doing astrophotography a couple years back. I got this lens to be able to get the framing I wanted. There was the making for a clear night, so I setup, got everything running with 2 minute exposures, iso 1600, F/4. Once I was setup, I retreated from the cold winters night to hang out by the fire.. by the time I went to go check outside the clouds rolled in so I packed up. I only got 3 clean exposures. I was kind of **** off, but the weather was due to be clear the following night. So I setup again, and this time I got 137 2 minute exposures. 4.5 hours of relatively good data. I collected my darks and bias and went to bed.
I processed the 3 exposures from the failed night just to see what I got, and ended up with a half decent image with a nice showing of nebulosity. Nothing spectacular, but a good example of orion. I was really excited to see what more data would show. upon collecting 4.5 hours of data and spending the day calibrating, debayering, registering, and integrating, I thought that more time integrated equals more nebulosity, to bring out faint details.
Once I finished integrating the image, it didn’t seem as if there was a deeper red, or more data at all. I processed the 4.5hrs exactly the same as 6min and both seemed comparable.
Am I missing something in my integrating process?
I’m using pixinsight with the following settings
normalization: additive with scaling
weights: noise evaluation
Scale estimator: iterative k-sigma/biweight midvariance
check boxes checked:
generate integrated image
pixel rejection (1)
rejection algorithm: linear fit clipping
normalization: scale + zero offset
check boxes checked:
generate rejection maps
clip low pixels
clip high pixels
pixel rejection (2)
linear fit low - 5.0
linear fit high - 7.0
anyway.. any help would be appreciated in explaining what’s going on.