• Tighter framing — 400mm vs 300mm focal length
• 31% more light-gathering aperture

• Wider field — 300mm vs 400mm focal length
• Larger image circle (45mm) — supports bigger sensors
• Lighter (2kg vs 11.2kg) — easier to travel with

• Large emission nebulae and star clusters
• Fast imaging — short exposures per sub

• Wide-field nebulae and Milky Way regions
• Fast imaging — short exposures per sub
• Full-frame astro cameras and DSLRs

• With Full-frame (36×24mm, 3.76µm)
  FOV: 5.16° × 3.44°Scale: 1.94"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 3.37° × 2.25°Scale: 1.94"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 1.62° × 1.62°Scale: 1.94"/px

• With Full-frame (36×24mm, 3.76µm)
  FOV: 6.88° × 4.58°Scale: 2.59"/px
• With APS-C (23.5×15.7mm, 3.76µm)
  FOV: 4.49° × 3.00°Scale: 2.59"/px
• With IMX533 square (11.3×11.3mm, 3.76µm)
  FOV: 2.16° × 2.16°Scale: 2.59"/px

Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.

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