DeltaOptical/GSO Plössl 15mm 52° 1.25″ eyepiece

Looking for a versatile eyepiece that handles everything from the Moon to planets, nebulae and star clusters? The DeltaOptical/GSO Plössl 15mm is a classic choice that never disappoints. The time-tested Plössl design with a four-element optical system offers an excellent price-to-performance ratio and is well known to every experienced astronomer. The 15mm focal length makes it an ideal mid-range eyepiece - a generous enough exit pupil for comfortable viewing of wide objects, yet sufficient magnification for crisp planetary detail.

Optical quality and image clarity

Multi-layer anti-reflection coatings on all optical surfaces significantly reduce unwanted reflections, increase light transmission and ensure maximum image contrast. The result is a sharp, bright and vivid image free from rainbow flares or ghost images that cheaper single-layer coatings cannot suppress. The 52° field of view is standard for the Plössl design and pleasantly comfortable - the image does not feel like looking through a keyhole, yet there is no edge distortion as seen in aggressively wide-angle designs.

Compatibility and build quality

The 1.25″ barrel diameter ensures compatibility with the vast majority of telescopes on the market - refractors, Newtonian reflectors, SCT catadioptric systems and Maksutov designs. Simply insert it and start observing. The eyepiece body is solid and well finished, with a groove for the focuser's locking screw.

Magnification and typical use cases

The 15mm focal length makes this eyepiece an excellent choice as a primary or supplementary eyepiece for medium magnifications. Here are some examples of magnification depending on your telescope's focal length:

Telescope focal length	Magnification with Plössl 15mm	Ideal for
750mm	50x	Star clusters, larger nebulae, general planetary viewing
900mm	60x	The Moon, Saturn, planetary detail

The Plössl 15mm is a classic all-round eyepiece that beginners and experienced observers alike will appreciate as a reliable cornerstone of any eyepiece collection.

About the manufacturer - DeltaOptical/GSO

GSO (Guan Sheng Optical) is a renowned Taiwanese manufacturer of astronomical optics whose products sold under the DeltaOptical brand have earned a firm place in the lineups of serious astronomers worldwide. The brand's philosophy is built on careful manufacturing control, high-quality optical glass and thorough anti-reflection treatment - not as a marketing promise, but as a measurable result that observers appreciate in practice under the night sky.

Why choose DeltaOptical/GSO Plössl eyepieces?

Proven four-element Plössl optical design
Multi-layer anti-reflection coatings on all optical surfaces
52° apparent field of view - comfortable and distortion-free
1.25″ barrel - compatible with the vast majority of telescopes
Solid, well-finished body with locking screw groove
Excellent entry point into quality optics without overpaying

Technical specifications

Parameter	Value
Focal length	15mm
Apparent field of view	52°
Barrel diameter	1.25″
Optical design	Plössl (4 elements)
Coatings	Multi-layer anti-reflection on all surfaces
Manufacturer	GSO (Guan Sheng Optical) / DeltaOptical

Recommended accessories (all in stock):
	Binorum SmartPhoto Deluxe 1.25″ Smartphone Adapter	Binorum SmartPhoto Deluxe 1.25″ Smartphone Adapter The Binorum SmartPhoto Deluxe is a universal smartphone adapter engineered to transform your mobile device into a powerful astronomical and optical imaging instrument. Designed with the modern observer in mind, this adapter seamlessly connects your smartphone to telescopes, binoculars, spotting scopes, monoculars, and microscopes, enabling high-quality mobile photography of celestial objects, terrestrial scenes, and microscopic details. Whether you are a casual stargazer wanting to share lunar images with friends or a serious amateur astronomer conducting systematic astrophotography, the SmartPhoto Deluxe provides an accessible gateway into the world of optical imaging. Universal Optical Compatibility The...	26.15 €
Binorum SmartPhoto Deluxe 1.25″ Smartphone Adapter The Binorum SmartPhoto Deluxe is a universal smartphone adapter engineered to transform your mobile device into a powerful astronomical and optical imaging instrument. Designed with the modern observer in mind, this adapter seamlessly connects your smartphone to telescopes, binoculars, spotting scopes, monoculars, and microscopes, enabling high-quality mobile photography of celestial objects, terrestrial scenes, and microscopic details. Whether you are a casual stargazer wanting to share lunar images with friends or a serious amateur astronomer conducting systematic astrophotography, the SmartPhoto Deluxe provides an accessible gateway into the world of optical imaging. Universal Optical Compatibility The...
	Smartphone adapter Binorum	Binorum SmartPhoto - Universal Smartphone Adapter Capture stunning photos and video recordings through your telescope or microscope using your smartphone with the universal Binorum SmartPhoto adapter (smartphone mount, phone holder). This versatile adapter allows you to attach any smartphone model to your telescope, microscope, binoculars, or spotting scope. Unlock Your Smartphone's Imaging Potential Now you can photograph Saturn's rings, record high-quality videos of wildlife, capture the movements of ciliates under the microscope, and document countless other fascinating subjects - all with the camera you already carry in your pocket! Simple Setup in Seconds Assembly couldn't be easier: Attach the adapter...	22.25 €
Binorum SmartPhoto - Universal Smartphone Adapter Capture stunning photos and video recordings through your telescope or microscope using your smartphone with the universal Binorum SmartPhoto adapter (smartphone mount, phone holder). This versatile adapter allows you to attach any smartphone model to your telescope, microscope, binoculars, or spotting scope. Unlock Your Smartphone's Imaging Potential Now you can photograph Saturn's rings, record high-quality videos of wildlife, capture the movements of ciliates under the microscope, and document countless other fascinating subjects - all with the camera you already carry in your pocket! Simple Setup in Seconds Assembly couldn't be easier: Attach the adapter...
	Astronomy Eye Patch for Telescope Observing	Astronomy Eye Patch for Telescope Observing Yes, you will look like a pirate. But we are fairly confident that after your first night using this eye patch, you will not leave home without it. It is one of the simplest and yet most effective accessories an amateur astronomer can own - a small addition to your kit that makes every observing session noticeably more comfortable while protecting both your eyes and your facial muscles from unnecessary strain. Why Does Squinting Cause Fatigue? When looking through a telescope eyepiece, most observers instinctively close or squint the eye that is not being...	12.15 €
Astronomy Eye Patch for Telescope Observing Yes, you will look like a pirate. But we are fairly confident that after your first night using this eye patch, you will not leave home without it. It is one of the simplest and yet most effective accessories an amateur astronomer can own - a small addition to your kit that makes every observing session noticeably more comfortable while protecting both your eyes and your facial muscles from unnecessary strain. Why Does Squinting Cause Fatigue? When looking through a telescope eyepiece, most observers instinctively close or squint the eye that is not being...

This product is available in the following variants:
Eyepiece Delta Optical Plossl 4mm 52° 1.25″	35.65 €
Eyepiece DeltaOptical/GSO Plössl 12mm 52° 1.25	38.10 €
DeltaOptical Plossl 20mm 52° 1.25″ eyepiece	39.15 €
DeltaOptical/GSO Plössl 15mm 52° 1.25″ Eyepiece	41 €
Eyepiece Delta Optical Plossl 6mm 52° 1.25″	41 €
Eyepiece Delta Optical Plossl 40mm 45° 1.25″	45.15 €
Eyepiece Delta Optical Plossl 9mm 52° 1.25″	45.35 €
DeltaOptical Plossl 32mm 52° 1.25″ eyepiece	48.85 €

DeltaOptical/GSO Plössl 15mm 52° 1.25″ Eyepiece