Application example: ESATTO with refractor telescopes
Thanks to the many available adapters, you can easily#use ESATTO as the new focuser for refractors and improve
performance, especially in astrophotography. Refractors, and especially the apochromatic models, are perfect in-
struments for astrophotography since they haven't a very long focal length (you can use them for very long exposi-
tion times also with affordable mounts) and they combine very good performance with easy of use.#But many re-
fractors use a focuser that may not be able to adequately support your camera and the accessories used in astro-
photography: let's see how you can improve your refractor telescope by replacing the#focuser with ESATTO.
Some of the problems you may have with standard!focuser
Astrophotography, especially the one aimed at deep-sky objects, requests not only for specialized cameras (usually
with large sensors and with a cooling system) but also for many# accessories like large motorized filter wheels.
When you have such a large# "imaging train", the first thing to consider is its weight: in fact most of the refractors
(especially the ones with an affordable price) are not provided with the weight load capacity that is needed to per-
fectly keep the camera in the focus position during the long exposition times requested in astrophotography, espe-
cially when the telescope is pointed to the zenith (the vertical position). If your focuser has not enough weight load
capacity, your camera and#accessories will slip and will bring your sensor#out of focus.#But if we use#ESATTO#as
focuser for refractors,#we'll have a high weight load capacity and you will be able to use also heavy imaging trains.
If the imaging train weight is higher than focuser's load capacity, the image train may slip during the imaging ses-
sion.
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