Do I need a field flattener with this telescope?

No. The SV503 70mm includes a built-in flatfield corrector, making it ready for APS-C astrophotography without additional flatteners.

Can I use this telescope with a DSLR?

Yes. You can use most DSLR or mirrorless cameras with a compatible T-ring and adapter.

What mount do you recommend?

An equatorial tracking mount like the Sky-Watcher EQ5, HEQ5, or ZWO AM5 is recommended for astrophotography.

Is this telescope suitable for visual use?

While it can be used visually, it’s optimised for imaging. A dedicated visual telescope may offer a better experience for beginners.

SVBONY SV503 70mm f/6.78 ED Quadruplet Telescope – Flatfield Ready

Name: SVBONY SV503 70mm f/6.78 ED Quadruplet Telescope – Flatfield Ready
SKU: F9359E
Price: 499.00 GBP
Availability: InStock

Svbony

F9359E

SVBONY SV503 70mm f/6.78 ED Quadruplet Telescope – Flatfield Ready

£499.00

Quantity

SVBONY SV503 70mm f/6.78 ED Quadruplet Refractor Telescope

Flatfield Astrograph with Built-In Correction & ED Glass – Perfect for APS-C Cameras

Built-In Flatfield Correction: No separate field flattener required
4-Element ED Lens: Features FPL51 and lanthanum glass for excellent colour control
Fast & Bright: 70mm aperture, 474mm focal length (f/6.78) ideal for nebulae and widefield imaging
Dual-Speed 2" Crayford Focuser: Fine focus at 1:10 ratio for pinpoint stars
Retractable Lens Hood: Blocks stray light and protects the optics during storage
1.25" & 2" Eyepiece Compatibility: Switch easily between visual and imaging setups

What’s in the Box

SV503 70mm ED OTA
Retractable Dew Shield
2" Dual-Speed Crayford Focuser
1.25" & 2" Eyepiece Adapters
Tube Rings & Vixen-Style Dovetail Plate
Dust Caps & Manual

Technical Specifications

Optical Design	Quadruplet APO Refractor
Aperture	70mm
Focal Length	474mm
Focal Ratio	f/6.78
Glass	FPL51 + Lanthanum
Field Flattener	Built-in, for APS-C cameras
Focuser	2" Crayford, 1:10 Microfocus
Mounting	Tube Rings with Vixen Dovetail
Weight (OTA)	Approx. 2.5kg

Designed for high-quality widefield astrophotography with DSLRs or CMOS cameras using APS-C sensors. Flat, sharp stars across the frame – no flattener needed.

🚚 Available for Pre-Order

Stock arriving June 20, 2025. Secure yours today with Dark Clear Skies UK.

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❓ FAQ – Click to Expand

Do I need a field flattener?
No. The SV503 70mm has built-in flatfield correction, ideal for APS-C sensors.

Can I use a DSLR?
Yes. You’ll need a T-ring and adapter for your camera brand.

What mount should I use?
We recommend an equatorial tracking mount such as the Sky-Watcher EQ5, HEQ5, or ZWO AM3/AM5 for astrophotography.

Is this good for visual observing?
It’s possible, but this telescope is designed and optimised for imaging.

SVBONY SV503 70mm f/6.78 ED Quadruplet Telescope – Flatfield Ready

£499.00

SVBONY SV503 70mm f/6.78 ED Quadruplet Telescope – Flatfield Ready