[Tech]

Hi,

I don't have much experience with cameras, but i need a camera for astrophotography in the near infrared band, and i was hoping you can help me with choosing it.


I need to photograph stars up to magnitude 2.5 (perhaps 3) – but this classification relates to magnitudes in the visual spectrum. Eventually I’d like to photograph stars up to magnitudes 5 or 6.



I need as high resolution as possible (but am currently not willing to put in $2000 yet), and high shutter speeds.
Honestly, i don't know what the shutter speeds will be, can someone tell me from experience?
The viewing angle will be 11° and i intend to use a 100 mm diameter lens.
The stars on the picture should be seen as at least 4 pixels wide and easily distinguishable from noise.
The picture will be (probably) filmed in, or post-processed to, grayscale.

I have chosen the following components:
· - Nikon d3200 - good price to resolution ratio, and as i read it has good sensitivity in near IR
· - 100 mm diameter manually adjustable - i don’t know which one to choose
· - an I or R band filter, perhaps a combination of both? - as far as i understand this should be chosen together with the lense

Are these suitable for my needs?
Is there a better set for what I need (for roughly the same or lower price)?
Is the lens unnecessarily large?


Thank you