• Construction: 9 elements, 6 groups
• Field of view: 180 deg
• Minimum focus: 6.4mm
• Filter size: 40.5mm (has a filter holder between the lens and the body)
• Weight: 1,240g
• Minimum aperture: 32

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Listings from eBay

【MINT in Case】 MAMIYA FISH EYE SEKOR C 37mm F4.5 for Mamiya RB67 S/SD

$950.00 End Date: Monday Apr-13-2020 13:46:11 PDT Buy It Now for only: $950.00 Buy It Now | Add to watch list

【 Rare! MINT 】 Mamiya Sekor C Fish Eye 37mm f/4.5 Lens For RB67 Pro S from JAPAN

$699.90 End Date: Thursday May-7-2020 8:21:09 PDT Buy It Now for only: $699.90 Buy It Now | Add to watch list

Mamiya SLR RB67 Fisheye Sekor C 37 37mm 4.5 Read Condition Premium Lens as Is

$485.32 End Date: Monday Apr-20-2020 18:34:41 PDT Buy It Now for only: $485.32 Buy It Now | Add to watch list

【Exc+4 in Case】 Mamiya Fish Eye Sekor C 37mm F4.5 Lens for Mamiya RB67 #99

$549.99 End Date: Thursday May-7-2020 6:27:12 PDT Buy It Now for only: $549.99 Buy It Now | Add to watch list

[Great Appearance] MAMIYA SEKOR C 37mm f4.5 w/ Caps for RB67 RZ67 from Japan 089

$594.99 End Date: Sunday Apr-12-2020 8:00:56 PDT Buy It Now for only: $594.99 Buy It Now | Add to watch list