Application example: ESATTO with Ritchey-Chretien telescopes
ESATTO is the perfect focuser for Ritchey-Chretien telescopes, that are great instruments for deep-sky astrophoto-
graphy at medium-long focal length.# Ritchey-Chretien telescopes were, just a few years ago, very expensive but
now, especially the models produced by GSO, are#very affordable and allow any amateur astronomer to own and
use a#Ritchey-Chretien telescope. Unfortunately these telescopes comes standard with a focuser that has not the
load capacity requested for the heavy cameras and accessories commonly used in deep-sky astrophotography:
let's see how you can use ESATTO#as a new and better focuser#for Ritchey-Chretien.
#
!The right adapter to use ESATTO as focuser for!Ritchey-Chretien
Ritchey-Chretien telescopes produced by GSO have# 2 different threads in the rear part of the telescope and that
you can find by removing the original focuser. A# 90mm#male thread on 6" and 8" models or#a#117mm#thread on lar-
ger 10", 12", 14" and 16" models.# In order to use ESATTO as#focuser for Ritchey-Chretien, we designed# 2 adap-
ters: the# PL3600235 adapter allows you to use the ESATTO 2" on GSO# Ritchey-Chretiens 6" and 8".
The#PL3600236 adapter allows you#to use the ESATTO 3" on GSO#Ritchey-Chretiens 10", 12", 14" and 16”.
ESATTO as focuser for Ritchey-Chretien telescopes: to the left the 90mm thread that you can find on GSO 6" or 8"
Ritchey-Chretien telescopes. To the right, the 117mm thread that you can find on GSO 10", 12", 14" or 16" Ritchey-
Chretien telescopes.
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