BORG 107FL Visual Sets

I just prepared for two kinds of Series 115mm visual observing sets. Biggest advantage over Series 80 is the larger focuser’s drawtube allows to avoid vignetting even when long light path accessories such as erecting mirror diagonals and Binoviewers etc are used.

107ezm

With BinoTechno erecting mirror diagonal and Masuyama 26mm

So far, BORG 107FL and Masuyama 26mm was the best combination for the wide field of view in my experience. 32mm wasn’t unfortunately.

BinoTechno 2″ EZM requires almost 150mm extra back focus. Generally 30mm longer than conventional 2″ diagonal(?). The focuser drawtube position in above picture shows it’s in focus at the infinity.

These two packages have been added in Hutech E-store. Major differences between these two packages are the focus travel and with an extension tube (7603) or without.

0309a

Main tube – 8240 is same length as F3.9 configuration. So it’s quite easy to convert F3.9 to visual or prime focus setup.

~ by tedishikawa on March 9, 2020.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

 
%d bloggers like this: