Long Jobs on Syndicate piers - it may be worth while asking other members in some cases ?

As you all know we are an easy going bunch and tend to leave you all to it mostly, this week however I got a DM asking if I would take a look at some of the job lengths for bright objects that are in Pier-14 as they felt some were excessive.
After checking today I tend to agree somewhat but I am inclined to make suggestions so you the members perhaps sort it out between yourselves as we prefer to leave it very casual rather than have a heavy handed approach.
I am not going to mention any jobs in particular, I will just say this pier is a super fast F/3.3 optical system* with a modern CMOS sensor so bright objects on the whole do not need as much data as we did in the dark ages of CCD cameras :)
My suggestion is to adopt the same principle we have for multi pane mosaics - Ask the other members first!
If you wish to input a job in excess of 15 hours for example, just ask it in the forum with reasons why you think your job has merit like HA background, Flux etc. if after a few days you hear nothing back or you get nods of approval just put the job in the queue.
*Below is an example of imaging times in relation to telescope optical F/Ratios, I hope hope it helps members on all piers when trying to decide on how much data they really need :)

7 second exposures at F/1.2 equates to:

* F/1.4 - full F/Stop slower than F/1.2 = 14s
* F/2.0 - full F/Stop slower than F/1.4 = 28s
* F/2.8 - full F/Stop slower than F/2.0 = 56s
* F/3.2 - qtr F/Stop slower than F/2.8 = 70s
* F/3.6 - half F/Stop slower than F2.8 = 84s
* F/4.0 - full F/Stop slower than F/2.8 = 112s
* F/5.6 - full F/Stop slower than F/4.0 = 224s
* F/6.8 - half F/Stop slower than F/5.6 = 336s
* F/8.0 - full F/Stop slower than than F5.6 = 448s

This same exponential scale also applies to how the signal is acquired and why fast scopes need shorter exposures so you don't clip star detail.

7 minutes of total integration time @ F/1.2 equates to:

* F/1.4 - full F/Stop slower than F/1.2 = 14m
* F/2.0 - full F/Stop slower than F/1.4 = 28m
* F/2.8 - full F/Stop slower than F/2.0 = 56m
* F/3.2 - qtr F/Stop slower than F/2.8 = 70m
* F/3.6 - half F/Stop slower than F2.8 = 84m
* F/4.0 - full F/Stop slower than F/2.8 = 112m
* F/5.6 - full F/Stop slower than F/4.0 = 224m
* F/6.8 - half F/Stop slower than F/5.6 = 336m
* F/8.0 - full F/Stop slower than than F5.6 = 448m

What is an F-Stop, I hear you ask?



Put simply, its a term mainly used in photographic circles but that does not make it any less relevant in astronomy. Before the light from the night sky can hit your camera’s sensor and help create an exposure, it must first travel through the telescope or camera lens. The amount of light that reaches the sensor depends on your lens setting or telescopes speed. With a camera lens you use aperture blades to alter the speed of the lens and with a telescope it’s the optical design that defines the speed (although it can be altered by stopping down the aperture at the front)

However that's a whole different topic for another discussion, so for the sake of this post lets just say its fixed :)
 
Steve