Addendum - Telescopes and Lenses |
TS-Optics 90/600 APO Triplet |
updated: 2024-10-15 |
TS-Optics Apochromat (APO) Triplet 90/600 (out of stock!) |
Lens: APO906-O (Replacement part) |
Total Operational Weight
including ASIAIR PLUS, ZWO30F4 Mini Guide Scope on a dual finder scope bracket, ZWO ASI 120MM guide camera, telescope according to standard CID09 configuration full camera tail with ZWO ASI294 MC Pro Color camera and all cables : 6.110 kg (below the 8kg limit of the ZWO-AM3 mount without counter weights.)
Details
Aperture: |
90 mm |
Focal length: |
600 mm |
Focal ratio: |
f/6.6 |
Objective: |
Multi-coated APO triplet lens - FPL53 |
Tube: |
CNC metal tube with 2 additional tube segments |
Limiting magnitude: |
12.3 mag |
Resolving power: |
1.29" |
External diameter of dew cap: |
116 mm |
Length: |
500 mm |
Weight: |
4 kg |
Dew cap: |
extendable - can be locked with a screw |
Focuser: |
2.5" CNC focuser |
Connection on eyepiece side: |
2", 1,25" and M63x1 female thread |
Connection from tube to focuser: |
M88x1 female thread on the tube |
Outside Dimension of the case: |
570 x 225 x 290 mm |
Image Quality of the TS-Optics APO 90mm Objective - SPOT diagram and star test
The Spot Diagram is ideal for judging the colour correction of a telescope, not only on the optical axis, but also off axis. The black rings are the airy discs. As you can see all wavelengths between 500nm and 700nm are kept inside the airy disc. Off axis (second line: 1/4°, third line: 1/2°) the colour is still very well corrected - just compare this with some very expensive APO Objectives.
The Star Test on our artificial star is equivalent to the image of a real star at a magnification around 200x. But please note that our artificial star works in autocollimation. This means that whatever optical defects there are, you will see the effects twice as strongly as on a real star!
Images from left to right:
♦ far inside of focus
♦ slightly inside of focus
♦ a focused medium magnitude star (around 5-6 mag)
♦ a focused bright star (e.g. Vega)
♦ slightly outside focus
♦ far outside focus
As you can see false colour is virtually nonexistent in focus. You can also see that the star is well centered. This also shows that the lens is not pinched inside its cell.
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