• Tighter framing — 840mm vs 480mm focal length
• 50% more light-gathering aperture

• Wider field — 480mm vs 840mm focal length
• Faster optics at f/6 vs f/7
• Lighter (4.5kg vs 11.5kg) — 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: 2.46° × 1.64°Scale: 0.92"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 1.60° × 1.07°Scale: 0.92"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 0.77° × 0.77°Scale: 0.92"/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.