Six inches of refractor at f/5 — this is as big as achromatic refractors get before they become unwieldy, and the FirstLight AR152 pushes the format to its practical limits. The Explore Scientific FL-AR152760 is a 152mm f/5 achromatic doublet with a 760mm focal length, sold as an OTA for observers who need maximum refractor aperture paired with their own mount. At this aperture, star clusters become staggering wide-field spectacles and bright nebulae show internal structure that smaller apertures can only suggest.
Unlike smaller achromatic refractors
The jump from 102mm to 152mm is not incremental — it's 2.2× more light-collecting area. At f/5, the AR152 is a wide-field instrument: a 2-inch 30mm eyepiece gives an exit pupil above 6mm and a true field approaching 3°, sweeping in vast swaths of the Milky Way. Chromatic aberration at f/5 is more pronounced than slower achromats — this is a visual wide-field scope first, not a planetary precision instrument or an imaging scope. But for sweeping nebulae, open clusters, and rich-field observing, nothing at this price delivers more aperture in a refractor format. The 2.5-inch hex focuser handles the largest eyepieces available.
What you'll see
The Pleiades and Hyades fit fully in the field at low power, with pinpoint stars surrounding the bright members. The Orion Nebula is immersive — the full nebula complex including Barnard's Loop with appropriate filters. The North America Nebula becomes visible under dark skies with an OIII or UHC filter. M44 (the Beehive), M35, and other showpiece open clusters are best seen at the low powers this scope excels at. The 2.5-inch focuser accepts wide-field 2-inch eyepieces that make these views possible without cropping the field.
What's in the box
- 152mm f/5 achromatic doublet refractor OTA
- 2.5-inch hex-style rack-and-pinion focuser with 2-inch and 1.25-inch adapters
- Tube rings
- Vixen-style dovetail bar
- Dust caps
| Spec |
Value |
| SKU |
FL-AR152760 |
| Optical Design |
Achromatic Doublet Refractor |
| Aperture |
152mm (6 inches) |
| Focal Length |
760mm |
| Focal Ratio |
f/5 |
| Focuser |
2.5-inch hex-style rack-and-pinion |
| Included |
OTA only — mount not included |
Price Match, Shipping & Questions
We price-match any authorized Canadian or US retailer. Ships free to the contiguous US. Questions? Email us at support@telescopewolves.com or visit our contact page.
Frequently Asked Questions
What mount is required for this OTA?
A 152mm f/5 refractor is substantial — the tube alone weighs roughly 15–18 lbs. You need a mount rated for at least 25 lbs payload to have comfortable margin. For visual use, a heavy-duty alt-az like the Sky-Watcher AZ5 Deluxe or iOptron AZ Mount Pro is borderline; an EQ5- or EQ6-class equatorial or a more robust alt-az is recommended. Call us if you'd like mount pairing advice.
Will chromatic aberration be visible at f/5?
Yes — f/5 is a fast focal ratio for an achromatic refractor. A purple/blue fringe will be visible on bright stars, the Moon's limb, and planets. For wide-field visual observing on nebulae and clusters, this is rarely an issue. For high-power planetary work or imaging, it will be noticeable. Narrowband filters eliminate it for nebula imaging. If chromatic aberration is a concern, our ED doublet and APO triplet options are better suited.
Can I use it for astrophotography?
It's primarily a visual scope. At f/5, stars across a large imaging sensor will need a quality field flattener, and achromatic chromatic aberration will appear in color images with bright stars. Narrowband imaging (Ha, OIII, SII) sidesteps both issues — for nebula imaging under narrowband filters, the 152mm aperture is a genuine advantage. For broadband color imaging, an ED or APO refractor delivers better results.
How does this compare to the 127mm achromat OTA?
The AR152 has 42% more aperture by diameter and roughly 2× the light-collecting area. At f/5, it also delivers wider true fields of view than the 127mm at f/6.5. The trade-off is a heavier, longer tube and a beefier mount requirement. If you're committed to wide-field visual observing and have the mount to support it, the 152mm is a meaningful step up.
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