TEC APO110 FL f/5.6 Triplet The TEC 110 mm fluorite refractor provides a 616 mm focal length at f/5.6. Its oil-spaced fluorite triplet is intended for wide-field imaging and visual observing. The fluorite element is calcium fluoride, positioned between the two outer elements of the triplet.
Manufacturer model: TEC APO110 FL f/5.6 Triplet · Specifications checked against manufacturer data on 2026-11-04
The TEC 110 mm fluorite refractor provides a 616 mm focal length at f/5.6. Its oil-spaced fluorite triplet is intended for wide-field imaging and visual observing. The fluorite element is calcium fluoride, positioned between the two outer elements of the triplet.
Optical and mechanical construction
The objective uses a precision aluminium cell. An aluminium tube with internal anti-reflective treatment and baffles helps suppress stray light. The front lens has multilayer hydrophobic coatings.
Focusing
The supplied focusing arrangement is TEC dual-speed focuser; fine adjustment on both sides. TEC specifies 160mm from the focuser reference to the focal plane; this telescope backfocus is distinct from the spacing of an optional reducer or flattener.
Dimensions and configuration
The manufacturer lists an OTA weight of 5.7kg and a retracted/transport length of 610mm. Accessory-loaded weights, where supplied, are shown separately in the technical table.
Published metric dimensions are selected where imperial conversions disagree. Page footer incorrectly repeats APO140FL item metadata; the named APO110 description and 110/616 specification table determine the model.
Additional specifications
Added length at full focuser extension
89 mm
Working length mid focus
775mm
Center of gravity from the middle of the focusing knob 2 5 lbs 1 kg load
292mm
Center of gravity from the middle of the focuser telescope retracted
330mm
Weight with rings plate handle finder
6.8kg
Front lens coating
Multilayer hydrophobic coating
Optional accessories
Full-frame field flattener; alternative tube rings; carrying cases
1351110
Data sheet
Aperture
110mm
Backfocus
160mm
Dew shield diameter
130mm
Fluorite element
Calcium fluoride (CaF₂), middle element
Focal length
616mm
Focal ratio
5.6
Focuser
TEC dual-speed focuser; fine adjustment on both sides
Length with dew shield extended
710mm
Model
TEC APO110 FL f/5.6 Triplet
Objective cell
Aluminium
Optical design
Oil-spaced fluorite triplet
OTA weight
5.7kg
Theoretical resolution
1.1 arc sec
Transport length
610mm
Tube construction
Aluminium, internal anti-reflection treatment and baffles
Tube diameter
114mm
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TEC APO110 FL f/5.6 Triplet The TEC 110 mm fluorite refractor provides a 616 mm focal length at f/5.6. Its oil-spaced fluorite triplet is intended for wide-field imaging and visual observing. The fluorite element is calcium fluoride, positioned between the two outer elements of the triplet.
Manufacturer model: TEC APO110 FL f/5.6 Triplet · Specifications checked against manufacturer data on 2026-11-04
