Gerd Neumann jr. Spacer Set M48 — 2 mm, 1 mm and 0.5 mm Field flatteners, reducers and coma correctors give their best image only at the exact lens-to-sensor distance they were designed for. This set of three thin M48 spacer rings (article 10310221) from Gerd Neumann jr. lets you fine-tune that distance in small, repeatable steps.
Manufacturer model: Gerd Neumann jr. Spacer M48 (2mm, 1mm, 0.5mm), 10310221 · Specifications checked against manufacturer data on 2026-11-03
Gerd Neumann jr. Spacer Set M48 — 2 mm, 1 mm and 0.5 mm
Field flatteners, reducers and coma correctors give their best image only at the exact lens-to-sensor distance they were designed for. This set of three thin M48 spacer rings (article 10310221) from Gerd Neumann jr. lets you fine-tune that distance in small, repeatable steps.
Fine spacing in 0.5 mm steps
The set contains three rings, 2 mm, 1 mm and 0.5 mm thick. Placed over an M48 thread, singly or combined, they lengthen the optical path in 0.5 mm steps up to 3.5 mm in total.
Matching sets
Gerd Neumann jr. makes the same three-ring set for T2 and M68 threads. Gerd Neumann jr. adapters are designed and produced in Germany and, unless stated otherwise, made from black-anodised aluminium.
Specifications
Manufacturer article number
10310221
Thread
M48
Ring thicknesses
2 mm, 1 mm, 0.5 mm
Adjustment steps
0.5 mm
Maximum total spacing
3.5 mm
Material
Black-anodised aluminium (Gerd Neumann jr. adapter standard)
M48 version (10310221), not the T2 (10310231) or M68 (10310225) sets. Thread pitch, bore diameter and individual ring outer diameter are not published.
Gerd Neumann jr. Spacer Set M48 — 2 mm, 1 mm and 0.5 mm Field flatteners, reducers and coma correctors give their best image only at the exact lens-to-sensor distance they were designed for. This set of three thin M48 spacer rings (article 10310221) from Gerd Neumann jr. lets you fine-tune that distance in small, repeatable steps.
Manufacturer model: Gerd Neumann jr. Spacer M48 (2mm, 1mm, 0.5mm), 10310221 · Specifications checked against manufacturer data on 2026-11-03
