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Hi Tony,
The simple answer is no. There are a lot of contributing factors to the answer though. If we are talking purely about signal ( the bits of the image you want ) then technically they will be pretty close as we are simply talking about the number of photons hitting the sensor over a given amount of time. However longer exposures by rights with have more signal vs noise. Noise is the bit we don’t want. Then there’s things like amp glow that depending on the camera you are using can increase over long subs so you won’t get that in shorter subs. Then there’s the dynamic range of your camera. If you have a small well depth, over the space of 5mins you will loose star colour because the pixel will just read white. Shorter subs can be better for star colour. As you can see there are a lot of contributing factors. I try to keep it fairly simple to start with but you could talk for hours about the effects of different sub lengths, it’s all a balancing act and there is no straight forward answer.
Cheers Ryan
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