Following on from Fiske's Best 70mm for astronomy and me looking to replace my 25x100 with something better probably in the mid size range there are 2 obvious front runners that being the widely distributed 70mm BT's under various brands ES/APM/Sky rover and the Oberwerk XL (in grey of course)
82 or 100 BT's are currently not in the running here (i know which ones id buy if i has the money lol) Id like to start with a 70. I believe a 70 will go down to 15x and up to 50x according to ES site - sounds good to me..may aswell take a right first time approach and get into the BT ecosystem?
Firstly I can see why Fiske went with BT-70XL-ED, it ships from the same country, great product & service and piece of mind due to this but i didn't see that he considered the "SD Apo" options so im just wondering about the specs between the two
My local shop has the basic ES BT 70 for £1035 - id probably spend a little more if its worth it
The Sky Rover and APM "SD apo" options are slightly more from China or Germany. Im UK based so would be importing regardless. From reading last night i found:
APM 70 mm 45° SD Apo Binocular, with UF 18 max. 4° FOV 2 Element Air spaced FCD Apochromat (rear lens FCD100 Glass) 400mm Focal 4.5kg
Basically the same from sky rover with UF18's but i notice in the description "Optics: double separation achromatic objective lens, including one pice of super ED glass made in Japan" 3.7kg
APM or Sky rover with 18mm EPS = £1480 or £1366 + shipping+import+duty+VAT
Oberwerk BT-70XL-ED 70mm FK-61 ED objectives, 24mm of clear prism aperture 3.7kg<< this is all i can see and would be £1250 +shipping+import+duty+VAT but is this going to match or exceed the apm "sd apo"
Is the APM weighing more as it has better equipment in there? (Jurassic park reference ) I read another post on here where the user thought the sd apo offering was 27-28mm of clear prism vs oberwerks 24mm - not sure how true that is or if it should influence a decision?
TL:DR 25x100 will be eaten up to go into BT70 but can anyone shed insight on the oberwerk optics to help me decide which is the superior optic? Thanks for reading