Quote:
Originally Posted by axle01
Have a look at the Sony A7s and a really good cheap camera for astro that doesn't have to be modded is the Fuji XT-1
Al
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That's a very good point. Some (not sure if it's most?) of the Fuji APS-c sensors have a very strong Ha transmission (~43% for the X-Pro1 / X-E1 - see attached graph), which is considerably higher than the typical Canon, Nikon, Sony etc... sensors, typically in the 18 to 25% range, except for their specialist astro models like the older Canon 20Da or Nikon D810a. That is approximately double the transmission in Ha, hence allowing for a reduced Ha exposure time or lower noise for comparable exposure, all else being equal.
The only issue with some of the earlier Fuji APS-c cameras is their lack of adequate tethered USB control. That's not the case for all their models and some new software has been developed, which is backwards compatible, for certain nominated models, and maybe if you chance it, may even be OK with some of other non-designated models - Not sure.
Then of course there are all of the other excellent choices: Sony, Nikon and the later Canons (say 5Div and 6D, etc..), etc.., depending on your existing lens collection, or even in spite of it, if you decide to jump ship.
Best
JA
. Even if the wavelengths corresponding to Ha wavelengths are present as part of a broader band source, as they are in say an incadescent lamp, then an increase in transmission over such a comparatively narrow band may not be that noticeble - hidden amongst the all the orange/red as it were. Our eyes are less sensitive to light in this region, so whilst it may visually fool us, this approx 1 stop difference should not fool the sensor 
