Explore Scientific 2" Field Flattener – Precision Imaging for Fast Refractors
If you're a deep-sky astrophotographer using a fast refractor, you’ve likely encountered the frustration of field curvature—stars near the center of your image look pinpoint sharp, but those toward the edges turn into bloated, misshapen blurs. That’s where the Explore Scientific 2" Field Flattener steps in, offering a simple yet powerful solution to transform your telescope’s imaging performance.
Designed for refractors with focal ratios between f/5 and f/7, this high-quality optical accessory ensures your stars remain sharp and well-defined across the entire field of view, eliminating the curved focal plane that distorts stars at the periphery of your images. Whether you’re capturing wide-field nebulae, open clusters, or galaxies, this flattener helps you maximize the full potential of your refractor’s optics.
Why Use a Field Flattener?
Refractors, especially faster ones, inherently suffer from field curvature—a natural optical aberration that causes stars to appear in focus at the center while progressively blurring toward the edges. This is particularly noticeable in full-frame or APS-C sensor astrophotography, where the larger sensor size reveals these distortions more prominently.
The Explore Scientific 2" Field Flattener corrects this issue by adjusting the light path so that every star, from the center to the very edge, lands on the same focal plane. The result? Stunning, pinpoint stars across your entire image.
Key Features
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Optimized for f/5 to f/7 refractors – Designed to match the optical characteristics of fast refractors, providing the best balance of correction for a wide range of imaging setups.
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Large 2" barrel design – Ensures full-frame sensor coverage without vignetting, preserving a bright, even field across your astrophotos.
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Fully multi-coated optics – Reduces reflections and increases light transmission, improving contrast and preserving faint details in deep-sky objects.
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Threaded for filters – The 2" nosepiece includes standard filter threads, allowing you to seamlessly integrate light pollution or narrowband filters into your imaging train.
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Versatile camera connection – The flattener terminates in a standard M42 T-thread, making it easy to attach most DSLR and dedicated astronomy cameras with the appropriate T-ring or adapter.
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All-metal construction – A robust and precisely machined aluminum housing ensures durability while maintaining excellent optical alignment.
How It Works in Your Imaging Setup
Using the Explore Scientific 2" Field Flattener is as simple as inserting it into your focuser, attaching your camera, and fine-tuning your back focus. This flattener is designed for use with 55mm of back focus, which is standard for most astrophotography setups, meaning it will work seamlessly with your DSLR and T-ring or dedicated astro camera with appropriate spacers.
If you’re unsure about your specific back focus requirements, adjusting with additional extension rings may be necessary for optimal performance. The results, however, are well worth it—razor-sharp stars across your entire image, making your astrophotos look more professional and visually striking.
Who Should Consider This Flattener?
This field flattener is a must-have for astrophotographers using fast refractors who want to eliminate edge distortions without altering their telescope’s native focal length. It’s particularly well-suited for those with 80mm to 130mm refractors in the f/5 to f/7 range, ensuring a wide range of compatibility.
For those looking to enhance their imaging without the added complexity of a reducer-flattener combo, this straightforward, high-performance solution delivers exceptional results.
Final Thoughts
Astrophotography demands precision, and the Explore Scientific 2" Field Flattener is an essential tool for anyone looking to achieve stunning, flat-field images with their fast refractor. With its premium optics, durable build, and simple integration into your imaging train, this flattener is a game-changer for capturing deep-sky objects in all their glory.
NOTE: This device is for photographic use only. It is NOT intended for visual use.
