Experience Professional Astrophotography with the NAKOH 92GX SD Quintuplet APO Astrograph
The NAKOH 92GX SD Quintuplet APO Astrograph has been engineered for astrophotographers who demand uncompromising optical performance, exceptional mechanical precision and effortless compatibility with today's high-resolution astronomy cameras. Combining a premium five-element SD optical design with a permanently integrated field corrector, the 92GX delivers a perfectly flat imaging field without the need for an additional field flattener, allowing you to spend more time capturing the night sky and less time configuring your imaging train.
Designed specifically for deep-sky imaging, the telescope produces pinpoint stars across an impressive 55mm image circle, making it suitable for APS-C, Full Frame and many Medium Format sensors. Whether your target is expansive emission nebulae, delicate galaxy dust lanes, rich star clusters or sweeping Milky Way panoramas, the NAKOH 92GX delivers the sharpness, contrast and colour correction expected from a professional astrograph.
Every component has been designed with serious astrophotography in mind. From its precision CNC-machined optical tube and heavy-duty 3.5-inch rack-and-pinion focuser to its threaded imaging adapters and robust mounting hardware, the NAKOH 92GX provides the stability required to support modern cooled astronomy cameras, filter wheels, off-axis guiders and electronic focus motors during extended imaging sessions.
Advanced SD Quintuplet Optical Design
At the heart of the NAKOH 92GX is an advanced SD Quintuplet optical system, carefully engineered to maximise image quality across large imaging sensors. Unlike traditional doublet or triplet refractors that require separate field flatteners, the integrated optical design permanently corrects field curvature while maintaining outstanding colour correction throughout the visible spectrum.
The five-element configuration combines premium SD and ED glass elements to virtually eliminate chromatic aberration, ensuring stars remain clean, white and perfectly focused without unwanted purple or blue fringing. The result is exceptional contrast, high transmission and crisp stellar definition across the entire imaging field, even when using today's latest high-resolution CMOS astronomy cameras.
By incorporating the field correction directly into the optical system, spacing errors commonly associated with external flatteners are eliminated. This not only simplifies camera installation but also provides consistent imaging performance every time the telescope is used.
A Large Corrected Image Circle for Modern Cameras
Astrophotography sensors continue to increase in size and resolution, placing greater demands on telescope optics than ever before. The NAKOH 92GX has been specifically developed to meet these demands, providing a fully corrected 55mm image circle capable of supporting everything from compact APS-C cameras to Full Frame and many Medium Format imaging systems.
This generous illuminated field allows photographers to make full use of their sensor area while maintaining excellent edge illumination and consistently sharp star profiles. Whether capturing wide-field nebulae or mosaics of large galaxies, the telescope delivers confidence that every corner of the image will match the quality found at the centre.
For astrophotographers investing in premium cameras, the ability to fully exploit every pixel is essential. The NAKOH 92GX has been designed to do exactly that.
Outstanding Edge-to-Edge Sharpness
A telescope's true quality is revealed not by the stars at the centre of the frame, but by those at the very edge. Many refractors perform well centrally while exhibiting elongated stars or field curvature towards the corners. The NAKOH 92GX has been engineered to eliminate these compromises, maintaining superb optical correction across the entire imaging field.
The comparison below illustrates 100% crops taken from both the centre and corners of an image captured using the telescope. The remarkable consistency demonstrates the effectiveness of the integrated optical correction, with stars remaining tight, symmetrical and perfectly formed throughout the frame.
This level of performance allows astrophotographers to compose images with confidence, knowing that fine details remain crisp across the entire sensor without requiring heavy cropping during post-processing.
Compact Performance for Imaging Under Dark Skies
The NAKOH 92GX combines professional-grade optical performance with a compact and highly portable design. This makes it an excellent choice for astrophotographers who want a serious imaging telescope without the bulk normally associated with larger observatory refractors.
Its 92mm aperture provides a strong balance between light-gathering capability, resolution and manageable weight, while the wide-field optical design is ideally suited to deep-sky imaging. Mounted on a modern harmonic drive or equatorial mount, the telescope can form the centre of a powerful yet transportable astrophotography system.
The compact tube length also reduces the moment arm placed on the mount, helping to improve stability and guiding performance. Whether installed permanently in an observatory, used from a back garden or transported to a remote dark-sky site, the NAKOH 92GX is designed to deliver dependable results night after night.
Optical Performance Demonstrated by the Spot Diagram
Spot diagrams provide a valuable indication of how precisely a telescope focuses incoming light at different positions across the image field. Rather than showing performance only at the optical centre, the diagram below illustrates the predicted star shape from the centre towards the outer edge of the full-frame imaging area.
The tightly controlled spot sizes demonstrate the high level of correction built into the NAKOH 92GX optical system. This is particularly important when using cameras with small pixels, where even minor optical imperfections can become visible as bloated, distorted or elongated stars.
By maintaining compact spot sizes across the field, the telescope is able to preserve fine stellar detail and make effective use of modern high-resolution CMOS sensors. The result is cleaner raw data, more consistent star profiles and less need to crop away poorly corrected corners.
Excellent Illumination Across Large Sensors
Large imaging sensors require more than a flat field. They also need an optical system capable of delivering consistent illumination towards the edges of the frame. The relative illumination chart below shows how effectively the NAKOH 92GX maintains light transmission across its expansive image circle.
This strong off-axis illumination helps to reduce the severity of corner darkening when using full-frame and larger sensors. Flat-field calibration will still form part of a well-managed astrophotography workflow, but an evenly illuminated optical system gives you cleaner data and makes calibration more effective.
The generous 55mm image circle also gives the telescope room to accommodate large-format cameras, filter wheels and off-axis guiding systems without restricting the useful imaging field. For astrophotographers planning to upgrade to a larger sensor in the future, the NAKOH 92GX provides valuable flexibility and long-term compatibility.
Real-World Deep-Sky Imaging Performance
Technical diagrams are important, but the true test of an astrograph is the quality of the images it produces beneath the night sky. The NAKOH 92GX is designed to capture faint deep-sky structure while preserving natural star colour, fine detail and a clean background across the full field of view.
Its combination of premium glass, excellent colour correction and a permanently flattened field makes it particularly well suited to broadband and narrowband astrophotography. The telescope can be paired with monochrome or one-shot colour astronomy cameras to image a wide range of targets throughout the year.
M81 and M82 – Wide-Field Galaxy Imaging
The image below features M81, also known as Bode's Galaxy, together with the irregular starburst galaxy M82. This pair provides a demanding test of contrast and resolution, combining faint outer structure, bright galactic cores and a rich surrounding star field.
The NAKOH 92GX presents both galaxies within a generous field of view while retaining the fine structure required to reveal dust lanes and subtle variations in brightness. At the same time, the surrounding stars remain compact and well controlled across the image, demonstrating the benefit of the integrated field correction.
NGC 4565 – Resolving Fine Galactic Structure
NGC 4565, commonly known as the Needle Galaxy, is an edge-on spiral galaxy whose narrow profile and prominent central dust lane reward sharp optics and careful image processing. It is an excellent target for evaluating a telescope's ability to preserve fine detail while maintaining contrast against the surrounding sky.
The example image demonstrates the NAKOH 92GX's ability to render the galaxy's slender structure clearly while preserving clean, naturally shaped stars throughout the field. The telescope's excellent colour correction helps to prevent unwanted halos around brighter stars, while its flat-field design keeps the outer regions of the image usable.
This combination of resolution, contrast and edge-to-edge consistency makes the NAKOH 92GX suitable not only for large nebulae, but also for galaxies, star clusters and other smaller deep-sky objects that benefit from precise optical performance.
Premium Mechanical Engineering for Demanding Imaging Systems
Exceptional optics deserve equally capable mechanics. Every component of the NAKOH 92GX has been engineered to provide the rigidity, precision and reliability required for modern astrophotography. From its CNC-machined aluminium optical tube to its oversized 3.5-inch rack-and-pinion focuser, the telescope has been designed to support heavy imaging payloads while maintaining accurate collimation and repeatable focus throughout extended imaging sessions.
The robust construction minimises flexure between the optical tube, focuser and camera, ensuring stars remain sharp during long exposures. Whether your imaging train includes a cooled astronomy camera, motorised filter wheel, off-axis guider, electronic focuser or rotator, the NAKOH 92GX provides the stability needed for consistent results night after night.
Precision Dual-Speed Focuser
Achieving perfect focus is one of the most important steps in astrophotography. The NAKOH 92GX features a precision 3.5-inch rack-and-pinion focuser with smooth dual-speed adjustment, allowing both rapid coarse focusing and extremely accurate fine-focus control.
The supplied focus knob cap increases comfort during manual focusing while retaining compatibility with popular Electronic Automatic Focusers (EAFs). This allows users to begin with manual focusing before easily upgrading to fully automated focusing routines for unattended imaging sessions.
The focuser's robust construction also helps maintain precise camera alignment, reducing image tilt and ensuring reliable performance even when supporting heavier imaging accessories.
Heavy-Duty Losmandy Dovetail Included
A secure connection between telescope and mount is essential for accurate tracking and dependable guiding. Every NAKOH 92GX is supplied with a precision CNC-machined 300mm Losmandy-style dovetail plate, providing a rigid mounting platform compatible with a wide range of premium equatorial and harmonic drive mounts.
The extended dovetail also offers greater flexibility when balancing heavier imaging systems, making it easier to optimise the telescope's centre of gravity regardless of the camera and accessories being used.
CNC Tube Rings with Integrated Accessory Mounting
The precision-machined tube rings have been designed to do far more than simply hold the optical tube. Their lightweight yet exceptionally rigid construction provides multiple threaded mounting points for guide scopes, mini PCs, control systems, cameras and additional astrophotography accessories.
The integrated carry handle doubles as a versatile accessory bridge, allowing users to build a clean, organised imaging system while keeping additional equipment securely aligned with the telescope. Oversized locking knobs make positioning straightforward, even when wearing gloves during cold observing sessions.
This thoughtful mechanical design helps reduce cable strain, improves system balance and creates a more professional imaging platform.
Comprehensive Threaded Imaging Adapter System
The NAKOH 92GX is supplied with a carefully designed four-piece threaded adapter system, allowing photographers to build a secure imaging train without relying on compression-ring connections. Threaded connections improve rigidity, reduce the possibility of camera tilt and maintain precise optical alignment throughout long imaging sessions.
The supplied adapters support a wide range of imaging configurations while incorporating a convenient 2-inch filter thread within the M48 adapter. This provides additional flexibility when using filters for broadband, narrowband or light pollution reduction imaging.
By combining multiple threaded adapters with the large-format focuser, the telescope is ready to accommodate everything from DSLR cameras to professional cooled astronomy cameras and advanced filter wheel systems.
Designed with Practicality in Mind
Every dimension of the NAKOH 92GX has been carefully considered to maximise compatibility with modern astrophotography equipment. The technical drawing below illustrates the telescope's overall dimensions, focuser assembly, mounting hardware and supplied accessories, helping users plan their imaging setup with confidence.
The combination of compact dimensions, generous back focus, precision mechanics and premium optics makes the NAKOH 92GX an outstanding choice for beginners stepping into high-end astrophotography as well as experienced imagers seeking a professional wide-field astrograph capable of producing exceptional results for many years to come.
Why Choose the NAKOH 92GX?
The NAKOH 92GX SD Quintuplet APO Astrograph has been created for astrophotographers who refuse to compromise. By combining premium SD optics, an integrated flat-field optical design, a large 55mm image circle, precision CNC engineering and a professional-grade focuser, it delivers the performance demanded by today's most advanced imaging systems.
Whether you're capturing sprawling hydrogen nebulae, detailed spiral galaxies, rich open clusters or panoramic Milky Way landscapes, the NAKOH 92GX provides the sharpness, contrast and mechanical precision needed to transform long nights beneath the stars into breathtaking astrophotographs. It is a telescope designed not only to meet the expectations of modern imagers—but to exceed them.