7. 48 mm Extension Tubes & Spacer Rings

42 mm Female to 48 mm Male Adapter - SFA-M48F42

This adapts the M42 X .75 T thread to the over-sized M48 X .75 T thread. It adds about .9 mm to the M42 male thread length and measures 3.85mm in total length.

48 mm Extension Tube - 10 mm Long - SFE-M48-010

  This is a 48 mm extension tube that adds 10 mm of length. The outside diameter is 2.0". The male thread is just under 3 mm long and the female thread is about 6 mm deep. 

48 mm Extension Tube - 20 mm Long - SFE-M48-020

  This is a 48 mm extension tube that adds 20 mm of length. The outside diameter is 2.0". The male thread is just under 3 mm long and the female thread is about 6 mm deep. 

48 mm Extension Tube - 30 mm Long - SFE-M48-030

  This is a 48 mm extension tube that adds 30 mm of length. The outside diameter is 2.0". The male thread is just under 3 mm long and the female thread is about 6 mm deep. 

48 mm Extension Tube - 5 mm Long - SFE-M48-005

This is a 48mm extension tube that adds 5mm in total length. The outside diameter is 2.0". The male thread is 5mm long and the female thread is 4.5 mm deep.  IMPORTANT: Most 48mm male threads are longer than the female thread in this extension...

48 mm Female to 42 mm Male Adapter - SFA-F48M42-008

  This adapts the over-sized M48 X .75 T thread (same as 2” filter thread) to the standard M42 X .75 T thread. It adds about 8 mm to the spacing, so it is not recommended for use with a DSLR camera and our SFF3 flattener. However, when...

48 mm Spacer Ring - 1 mm Thick - SFE-M48-001

  This is a precision, CNC machined 48 mm ID spacer ring that is 1 mm thick. It provides 1 mm of additional space between the field flattener and the imaging camera. 

48 mm Spacer Ring - 2 mm Thick - SFE-M48-002

  This is a precision, CNC machined 48 mm ID spacer ring that is 2 mm thick. It provides 2 mm of additional space between the field flattener and the imaging camera. 

48 mm Spacer Ring - 3 mm Thick - SFE-M48-003

  This is a precision, CNC machined 48 mm ID spacer ring that is 3 mm thick. It provides 3 mm of additional space between the field flattener and the imaging camera. 

48 mm Variable Length (8 mm -12 mm) Extension Tube - SFE-M48-V

  This is an adjustable 48 mm extension tube that adds 8-12 mm of length. Thread is the standard 2" filter thread size of M48 X .75. The depth of the male thread is 9.5 mm and there is a thin (1.52 mm) threaded locking ring on this thread to adjust...

SFE-M48-0.50 -- 48 mm Spacer Ring - 0.5 mm Thick

  Description:  This is a precision, CNC machined 48 mm ID spacer ring that is 0.5mm thick. It provides 0.5mm of additional space between the field flattener and imaging camera.