The TS-Optics 50mm travel scope is an f/4 doublet refractor with one "ED" (Extra-low Dispersion) element to minimize chromatic aberrations. It is offered by Teleskop-Service Ransburg GmbH in Germany. It is a modular scope with a Crayford focuser and can accept a wide variety of diagonals and eyepieces.
For today's solar-imaging test, the scope was configured with a Lunt Solar Wedge, a Baader Solar Continuum filter, a Celestron Omni 2x Barlow lens, and a ZWO ASI120mm-s camera.
The ASI120mm camera has a 4.8 × 3.6-mm 12-bit monochrome sensor with 3.75-μm pixels (1280 × 960).
The Solar Continuum filter is a narrow-band (10 nm) filter centered on 540 nm (green). This filter eliminates residual chromatic aberrations from the atmosphere and telescope objective and works well with monochromatic sensors.
Images were obtained both with and without the barlow lens. The Barlow lens element was screwed directly onto the camera nosepiece with a lens-to-sensor spacing of 42.5 mm. The resultant amplification factor was 1.74.
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| With the Barlow lens. |
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| Without the Barlow lens. |
The present angular diameter of the sun is 0.542°. Combined with the stated pixel dimensions this yields a telescope focal length of 213mm or f/4.3 for the actual focal ratio.
For comparison to these "back-patio" images, here is a same-day image from NASA's Solar Dynamics Observatory in geosynchronous orbit:
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| Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams |
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