• Tighter framing — 910mm vs 480mm focal length
• 63% more light-gathering aperture
• Larger image circle (60mm) — supports bigger sensors

• Wider field — 480mm vs 910mm focal length
• Faster optics at f/6 vs f/7
• Lighter (4.5kg vs 10kg) — easier to travel with

• Medium-sized galaxies and planetary nebulae
• Full-frame astro cameras and DSLRs

• Large emission nebulae and star clusters
• Full-frame astro cameras and DSLRs

• With Full-frame (36×24mm, 3.76µm)
  FOV: 2.27° × 1.51°Scale: 0.85"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 1.48° × 0.99°Scale: 0.85"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 0.71° × 0.71°Scale: 0.85"/px

• With Full-frame (36×24mm, 3.76µm)
  FOV: 4.30° × 2.86°Scale: 1.62"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 2.81° × 1.87°Scale: 1.62"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 1.35° × 1.35°Scale: 1.62"/px

Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.

Best suited for beginners and wide-field enthusiasts running a portable travel rig.