S8292 astronomical telescope deep space photography focal plane adjustment rings M42, M48, M54 focal plane adjustment

S8292 M42 focal plane adjustment ring
 
M42 internal thread, length 10mm
M42 external thread, length 3.5mm
Weight: 65g
Minimum thickness: 12mm
Diameter: 65mm
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S8293 M48 focal plane adjustment ring
 
M48 internal thread, length 10mm
M48 external thread, length 3.5mm
Weight: 70g
Minimum thickness: 12mm
Diameter: 70mm
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S8294 M54 focal plane adjustment ring
 
M54 internal thread, length 10mm
M54 external thread, length 3.5mm
Weight: 75g
Minimum thickness: 12mm
Diameter: 75mm
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