Italian Telescopes | TI45 OPTICAL PERFORMANCES

The best optical performances ever seen for an f/3,5 Astrograph – TI 45 f/3,5

Telescopi Italiani has decided to show a full review about the awesome optical performances of our TI 45 Astrograph – reached thanks the design work carried out by the aerospace engineer Leonardo Priami.

No other manufacturer shows detailed diagrams like these.

SPOT DIAGRAM

The Spot Diagram and the other performance diagrams, was calculated:

On Axis (1)
9 mm from axis – corner of the KAF3200 (2)
21.65 mm from axis – corner of the KAI11002 (3)
26.10 mm from axis – corner of the KAF16803 and GSense 4040(4)
(27,4 mm from axis – corner of the Cmos IMX461)
30.65 mm from axis – corner of the KAF39000/KAF50100 (5)
(33,4 mm from axis – corner of the Cmos IMX411)
35 mm from axis (6)

TI 45 f/3,5 (450 mm aperture- 1575 mm focal length)

SPOT DIAGRAM vs FIELDS

THE GRAPH BELOW SHOWS A SPOT DIAGRAM UP OVER 35 MM OFF-AXIS (MORE THAN 70 MM REAL DIFFRACTION LIMITED CORRECTED FIELD)

MATRIX SPOT DIAGRAM

SPOT DIAGRAM vs WAVELENGTH

A very important diagram that nobody shows. Only after analyzing these curves we can see that the optic is pratically diffraction limited for every wavelengths. The black line is the Airy Disc radius, the numbers are the six fields.

RELATIVE ILLUMINATION

The Relative Illumination curve is the ratio between the light hitting the focal plane and the total light incoming. After said this, it is clear that we could reach very high relative illumination only reducing the total incoming light (for example reducing the secondary mirror size (!)). With a under-dimensioned secondary mirror we could have higher relative illumination but with a great loss of light (as if the primary mirror was working with a smaller diameter). We decided to optimize the illumination up to 30 mm off-axis with a well dimensioned secondary mirror. To understand this can help to see also the “Unvignetted Ray graph” that shows the complete collected light from the primary mirror. The 30% of lost light is the exact amount intercepted by the secondary mirror cell.

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P.IVA IT12695391008  SDI:     KRRH6B9