Universal 2

Universal 2" Field Flattener for Refractors f/5 to f/8

Universal 2" Field Flattener for Refractors f/5 to f/8


TS 2" Field Flattener for all Refractor Telescopes with 2" Focuser or bigger - Flat Field for Astrophotography

Διαθέσιμο με Προπαραγγελία

Διαθέσιμο με Προπαραγγελία

Στην περίπτωση αυτή περιλαμβάνονται προϊόντα που συνήθως δεν κρατάμε σε στοκ και για κάποιους λόγους -που δεν εξαρτώνται από την εταιρία μας- δεν μπορούν να είναι διαθέσιμα σε διάστημα μικρότερο των 14 ημερών.Στην κατηγορία αυτή περιλαμβάνονται και προϊόντα που προδιαφημίζονται από τους κατασκευαστές αλλά δεν άρχισε ακόμη η επίσημη διανομή τους στην ελληνική αγορά. Πιθανόν για τα είδη αυτά να παρέχεται δυνατότητα προπαραγγελίας με ειδική προνομιακή τιμή. Αν γνωρίζουμε ήδη την πιθανή ημερομηνία άφιξης του συγκεκριμένου προϊόντος, στις αποθήκες μας, τότε αυτή θα αναγράφεται ξεχωριστά και επάνω από την ένδειξη «ΚΑΤΟΠΙΝ ΠΑΡΑΓΓΕΛΙΑΣ»

Διαθεσιμότητα: Σε απόθεμα

Universal 2" Field Flattener for Refractors f/5 to f/8

One of the best correctors for Refractor Telescopes worldwide - from TS Optics

This revolutionary new field flattening system is the first one to our knowledge that offers a superior quality compared with conventional systems:

-- larger possible illuminated field through elimination of the "T2 keyhole". The flattener has 45mm clear aperture compared with 37mm for typical T2 adaptations.

-- excellent performance on a broad range of very different refractor telescopes from f/5 to f/8.

-- very large Back Focus distance of 109mm (exceptions: see below). This allows you to attach extra accessories between the camera and the flattener, like off-axis guiders, filter quick changers, ...

-- a multitude of different adaptations is possible. The flattener uses the standard 2" filter thread

Practical Applications:

tsflat 2

The left image shows a typical setup of the field flattener with f/7 refractors and a digital SLR camera.

-- The flattener is on the far left. It disappears completely inside the focuser.

-- Next to the flattener is an M48 extension tube to get the proper distance. The extension tube is available in several different lengths.

-- In this case the camera adaptation is through the conventional T2 thread via a T2 bayonet ring. For Canon EOS a separate adaptation is also available with a larger clear aperture.

-- For convenience a 2" stoppig ring is used to have a clearly defined focal position of the entire setup.

-- We are happy to assemble a kit specifically suited for your telescope, camera and accessories!

ts flat 2


-- field flattener with blackened lens edges. Multi-coated.
-- no focal reducer function!
-- thread on the telescope side: M48 (2" filter thread) female
-- thread on the camera side: M48 (2" filter thread) male
-- clear aperture 45mm (much larger than with conventional T2 systems)
-- the flattener disappears completely inside the focuser. It does not inherently require any extra back focus.

Recommended distances between the M48 thread of the flattener and the sensor of the camera:

For most refractors the optimum back focus distance is 109mm to 129mm from the M48 thread to the camera's sensor. Practical experience has demonstrated that the flattener has a large tolerance for deviations from the ideal distance. 5% deviation does not cause any deterioration of the image quality in an APS-sized sensor (DSLR). For smaller sensors (CCD) somewhat larger deviations may be acceptable, but please keep in mind the higher resolution of many CCD cameras which in turn suggests that the distance should be kept as precisely as possible. The main tests have been made with a Digital SLR camera with a 15.1mm x 22.7mm sensor.
Suggested Distances from the M48 thread of the flattener to the camera sensor:

The distance depends from the focal length of the telescope:

-- Focal Length < 450mm: 128mm
-- Focal Length 450-490mm: 123mm
-- Focal Length 500-550mm: 118mm
-- Focal Length 560-590mm: 116mm
-- Focal Length 600-690mm: 113mm
-- Focal Length 700-800mm: 111mm
-- Focal Length from 800mm: 108mm

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