Omegon Pro APO AP 72/400 – Compact Quintuplet Flat-Field Astrograph

The Omegon Pro APO AP 72/400 Quintuplet is a compact, fast apochromatic refractor designed for high-quality wide-field astrophotography. Its sophisticated five-element optical system incorporates two ED glass elements together with an integrated two-element field corrector, creating a highly corrected imaging system without requiring a separate field flattener.

With a 72mm aperture, 400mm focal length and fast f/5.6 focal ratio, this portable Pro APO is particularly well suited to large nebulae, star fields, open clusters and other expansive deep-sky targets.

A 44mm corrected image field provides the coverage required for full-frame imaging, while the large precision focuser, 140mm back focus and 360° camera rotation make the telescope ready for a serious modern astrophotography setup.

Omegon Pro APO 72/400 Highlights

• 72mm five-element quintuplet APO
• Two ED glass elements for excellent colour correction
• 400mm focal length
• Fast f/5.6 focal ratio
• Integrated two-element field corrector
• 44mm corrected image field suitable for full-frame sensors
• 140mm back focus
• 3-inch precision focuser with 1:10 reduction
• 360° camera rotation

Five-Element Optics with Double ED Glass

The heart of the Omegon Pro APO 72/400 is its advanced quintuplet optical system. Five lens elements work together, with two manufactured from carefully selected ED glass to minimise chromatic aberration and maintain accurate colour reproduction.

This sophisticated optical design helps produce clean, high-contrast stellar images with tightly controlled colour around bright stars.

All lens surfaces are multi-coated to reduce unwanted reflections and improve useful light transmission, helping the telescope deliver the contrast and clarity demanded by astrophotography.

Integrated Corrector and 44mm Flat Field

Rather than requiring an additional external field flattener, the 72/400 incorporates a two-element corrector directly into its five-element optical design.

The result is a flat and well-illuminated imaging field extending to approximately 44mm, making the telescope suitable for full-frame astronomy cameras as well as APS-C and smaller sensors.

An integrated corrector also simplifies the imaging train. There is no separate flattener to purchase or configure, giving you a cleaner and more straightforward route from telescope to camera.

Fast f/5.6 Performance for Deep-Sky Imaging

With just 400mm focal length at f/5.6, the Omegon Pro APO 72/400 is particularly attractive for wide-field deep-sky astrophotography.

The relatively fast focal ratio allows imaging data to be gathered efficiently, while the short focal length provides a generous field of view for larger astronomical targets.

It is an excellent choice for imaging targets such as large emission nebulae, dark nebula complexes, open clusters, extensive Milky Way star fields and wide-field mosaics.

Large 3-Inch Precision Focuser

Full-frame cameras and modern imaging trains require a focuser with sufficient clear aperture and mechanical stability. The Omegon Pro APO 72/400 is equipped with a substantial 3-inch geared rack focuser.

A 1:10 fine-focus reduction provides the precise adjustment required when reaching critical focus with high-resolution astronomy cameras.

The focuser combines smooth operation with the stability needed for demanding imaging equipment, while its generous aperture helps minimise unwanted restriction of the optical path.

140mm Back Focus for Flexible Imaging Rigs

The telescope provides a generous 140mm of back focus, giving astrophotographers considerable flexibility when assembling an imaging train.

This space can be particularly useful when incorporating equipment such as filter wheels, off-axis guiders, camera adapters and cooled astronomy cameras.

A supplied camera adapter provides an M48x0.75 male connection.

360° Camera Rotation for Perfect Framing

Framing is an important part of astrophotography, particularly when capturing elongated nebulae, galaxies or planning multi-panel mosaics.

The 360° rotating focuser lets you change the orientation of the camera without rotating the entire optical tube or disturbing the telescope's position on the mount.

This makes it quick and straightforward to achieve the composition you want once your target is centred and focused.

CNC-Machined Optical Tube

The optics are housed inside a robust CNC-machined metal optical tube. An internal anti-reflection aperture system is complemented by a dark, velvet-like lining designed to suppress stray light and help preserve image contrast.

The retractable dew shield can be extended during observing and imaging sessions, then retracted to reduce the telescope's overall size for storage and transport.

Compact Enough for a Portable Imaging Rig

At approximately 317mm long with a total listed weight of just 2.56kg, the 72/400 combines serious imaging capability with excellent portability.

The supplied Vixen-style dovetail rail makes the OTA compatible with a wide range of common astronomy mounts, while a Vixen/Sky-Watcher style finder base provides a convenient position for a compatible finder or compact guidescope.

Omegon Pro APO AP 72/400 Specifications

What's Included?

• Omegon Pro APO AP 72/400 Quintuplet OTA
• Integrated field corrector
• M48x0.75 camera adapter
• Tube clamps
• Vixen-style dovetail rail
• Retractable dew shield
• 1.25-inch and 2-inch eyepiece adapters
• Vixen/Sky-Watcher style finder base

Who Is the Omegon Pro APO 72/400 For?

The Omegon Pro APO AP 72/400 Quintuplet is particularly suited to advanced astrophotographers looking for a genuinely portable flat-field astrograph capable of working with large imaging sensors.

Its combination of a fast f/5.6 focal ratio, double-ED quintuplet optics, integrated correction and 44mm image field makes it particularly compelling for wide-field deep-sky astrophotography.

It can also be used for visual lunar, planetary and deep-sky observation with suitable accessories, giving the telescope additional versatility outside the imaging rig.

Portable Size, Serious Imaging Performance

For astrophotographers who want to keep their imaging system compact without sacrificing optical sophistication, the Omegon Pro APO 72/400 offers an impressive specification: five-element optics, two ED elements, integrated correction, full-frame coverage and a precision 3-inch focuser in a telescope little over 30cm long.

Available from Dark Clear Skies – UK astronomy equipment specialists.