for Doug in S.A (astro image using 400L)
I think there was a chap called Doug here,thinking about buying a 400 L for astro work,I had this image ,but only just found it,
Hope it gives you an idea of the field of view,not a good image-I really do not do a huge amount of imaging,but with a good mounting bracket for this lens and guiding and stacking-you should get some wonderful images Doug
(image 7 minutes exp unguided)
Hope this helps,Chris
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