TS Optics 72/432 FPL53 Photoline Apochromatic Refractor OTA - Only tube with accessories, without mounting, without tripod

TS Optics 72/432 FPL53 Photoline apochromatic refractor OTA

Looking for a compact yet optically precise telescope capable of both visual observation and astrophotography? The Photoline series from TS Optics has the answer: an apochromatic FPL53 doublet refractor with a 72 mm aperture and 432 mm focal length, built around Japanese Ohara FPL53 ED glass. This OTA combines low weight, careful craftsmanship and outstanding optics in one convincing package - appreciated by experienced astronomers and passionate astrophotographers alike.

Optics - FPL53 ED glass for a sharp, color-accurate image

At the heart of this refractor is an apochromatic doublet assembled from Japanese Ohara FPL53 ED glass - one of the best low-dispersion optical glasses available on the market. Chromatic aberration is suppressed to an absolute minimum, stars appear sharp and pinpoint without color fringing, and contrast is significantly better than in conventional achromats.

The 72 mm aperture at a focal length of 432 mm (f/6 ratio) delivers a bright and fast objective that is particularly attractive for imaging extended objects - nebulae, galaxies and star clusters. Key optical performance figures:

• Resolving power: 1.60 arc seconds
• Limiting stellar magnitude: 11.1 mag
• Maximum useful magnification: 144x

These figures provide a solid basis for meaningful observation even from suburban locations. All optical surfaces carry a multi-layer anti-reflection coating that maximizes light transmission and reduces unwanted reflections.

Focuser - precise 1:10 micro-reduction for astrophotography

The rack-and-pinion focuser features a 77 mm diameter aluminum drawtube designed to safely carry accessories of up to 5 kg - important when using a heavier camera with a reducer or additional adapters. The 1:10 micro-reduction gearing allows micrometric fine focusing, which is absolutely essential for astrophotography.

The focuser accepts eyepiece adapters for both 1.25″ and 2″ accessories, making it fully compatible with standard equipment. A ring clamp for locking the focuser position is included as standard. Focuser rotation and motorization are not included in the basic package but can be added using third-party motor focusers.

Tube and mechanics - lightweight, travel-ready design

The fully enclosed aluminum tube comes with a retractable dew shield included in the package, which helps extend observing sessions on cold nights. Key physical parameters:

The Photoline 72 fits in virtually any backpack and mounts easily on smaller equatorial mounts. A Vixen-style dovetail bar and tube rings are included in the delivery, so the telescope can be mounted immediately.

Applications - who is this telescope for?

Astrophotography of deep-sky objects

The fast f/6 ratio combined with an apochromatic optical design makes the Photoline 72 ideal for astrophotography of nebulae and galaxies - short exposure times, minimal chromatic aberration and a sharp image to the corners of the frame, especially when used with a suitable field flattener or focal reducer.

Visual observation

At maximum useful magnification of 144x, lunar and planetary observation yields a detailed and color-accurate image. The suppression of chromatic aberration compared to achromats is immediately noticeable.

Daytime nature observation

Thanks to its compact dimensions, the Photoline 72 is also suitable for daytime use on a tripod - for birdwatching or landscape observation.

The telescope is recommended for advanced users who appreciate optical quality and know how to make full use of it.

Why choose the TS Optics Photoline series?

The Photoline series from TS Optics has earned a firm place among European astronomers over the years - and for good reasons. Every telescope in this series undergoes strict optical quality control and is designed with the needs of real observers and photographers in mind, not merely as a marketing product. The use of FPL53 glass, precise focuser mechanics with fine reduction gearing and a sensible weight make the Photoline 72 a reliable companion for both travel and stationary use.

If you are looking for a refractor that will still bring you joy after years of use and will not let you down even in demanding astrophotography sessions, the Photoline 72/432 is a choice you will not regret.

Technical specifications