• Tighter framing — 1624mm vs 910mm focal length
• 56% more light-gathering aperture

• Wider field — 910mm vs 1624mm focal length
• Faster optics at f/7 vs f/8
• Larger image circle (52mm) — supports bigger sensors
• Lighter (7.7kg vs 10kg) — easier to travel with

• Small galaxies, planetary nebulae, lunar & planetary detail
• High-resolution long-exposure work
• Faint-object imaging under dark skies
• Full-frame astro cameras and DSLRs

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

• With Full-frame (36×24mm, 3.76µm)
  FOV: 1.27° × 0.85°Scale: 0.48"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 0.83° × 0.55°Scale: 0.48"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 0.40° × 0.40°Scale: 0.48"/px

• 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

Best suited for experienced imagers chasing detail running a backyard imaging setup.

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