Quote:
Originally Posted by Atmos
It can actually be quite complicated but here is a quick example. You have a 10" F/5 and a 10" F/10. On both telescopes you use a KAF8300 which has 5.4 micron pixels.
On the 10" F/5 you are imaging at 0.877"/pixel while on the 10" F/10 you are at 0.44"/pixel.
This means that every pixel is capturing four times the area (four times as many photons) on the F/5 than the F/10. Now the confusing part is as follows. Let's say the 10" F/4 used the ASI1600 with 3.8 micron pixels and you had one of the older KAF 1024x1024 15 micron sensors (Amdor still work with them I believe).
In this case the 10" F/4 is at 0.617"/pixel while the 10" F/10 is at 1.218"/pixel. In this instance the slower telescope is in essence near four times faster as each pixel captures near four times the surface area.
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I think I understand what you mean. thank you. Out of interest, from my understanding, what you have described is from the 1st example in my earlier post. Is that correct?
Also, is there any truth in the analogy of the pipe in my example #2?