Docter 12.5 mm 90°, new Astroversion
After many excellent reports of this ultrawideangle eyepiece, but also many complains that on several scopes with small backfocus, like Dobsonians, where the eyepiece does not reach the focus, Docter took our order for an exclusive Astroversion of this eyepiece. The body is now fully redesigned, the focusing system has been removed, the eyepiece is more lightweight and can be used now in all excisting telescopes without any further trouble of backfocus.
weight 327 gramm
focallength 12.5 mm
field 90° FOV
eyerelief 10 mm
barrel 1.25" and 2"
filter thread M28.5 -1.25"
Necessary backfocus in comparison with known eyepieces using the Docter with 2" barrel in 2" focusers:
25 mm less infocuse than Tele Vue Nagler 31 mm
17 mm less infocuse than Pentax XL 5,2 mm
Using the Docter with 1.25" barrel in 1.25" focuser/adapter:
6 mm less infocusethan in Tele Vue Nagler 31 mm
2 mm more infocuse than in Pentax XL 5.2 mm
for europe include 16% VAT € 398
for export without VAT US $ 385