X26 Series

Lens Mounts and Holders

Specifically designed for use with X26 Rails and Carriers
Ideal for creating rail-based multi-element optical systems
Lens mount barrels are stackable

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Overview
Specifications
Ordering
Drawings
Literature & Downloads

B Series Lens Mount Barrels are used for mounting simple lenses and achromatic doublet lenses to protect them from possible damage. These lens barrels can be integrated into an optical system by mounting them in SB or CB Series Lens Barrel Holders. The lens barrels consist of a threaded body and a retaining ring; when screwed together, the lens is securely held in place. For thick lenses, the retaining ring is reversible. Two or more lens barrels can be threaded end-to-end to construct simple optical systems.

Lens barrels for 6.35 and 12.7 mm diameter lenses have a M20.25 RMS thread on the outside diameter for mounting into B18 Series Lens Mount Barrels. The B20-RMS Focusing Barrel allows axial translation of an optic over 5 mm by turning the knurled knob. The B25.4-RT Rotation Barrel allows 360° rotation of an optic with 2° graduations. The B25.4-F Barrel allows 25.4 mm diameter mirrors or lenses to be mounted to M20.25 RMS-threaded components.

SB Series Lens Barrel Holders are available to mount all sizes of B Series Lens Mount Barrels or mirrors on a post or in the X26 rail system. SB19 is compatible with B25.4 . The standard optical axis height for SB19 is 19.5 mm. These holders should be mounted to UMR5 Series Linear Stages on top of CN26 Carriers to maintain the normal 40 mm optical axis height of the X26 rail system. The SB32 accepts the 18 to 50.8 mm size barrels. It can be directly fixed to the CN26 Carriers and will have a 40 mm center height above the rail. SB19 and SB32 are delivered with three screws, three washers, and a retaining ring that permits direct assembly of mirrors and other optics.

CB Series Lens Barrel Holders provide a means of holding B Series Lens Mount Barrels for up to 50.8 mm diameter lenses on the X26 rail system at an optical axis height of 40 mm above the rail. The CB26 with smaller thread diameter have a 14 mm diameter hole to enable the micrometer on a linear stage to pass through, allowing components to be mounted closer together.

Model SB32.25.4

B Series Lens Mount Barrels

Model B18-15.5

Model B20-RMS

Left to right: B25.4-RT , B20-RMS , and BA20RMS

SB Series Lens Barrel Holders Models SB19.18 and SB32.50

B Series Lens Mount Barrels

CB Series Lens Barrel Holders Models CB26.22.4 and CB26.50

CS26 Bellows

Specifications

B20-RMS Focusing Barrel
Travel	5 mm
B25.4-RT Rotation Barrel
Diameter, Outside	50 mm
Graduations	2°
CS26 Bellows
Diameter, Outside	80 mm
Diameter, Inside	56 mm
Diameter, End	For M55 x 0.75
Length, Compressed	100 mm
Length, Extended	450 mm
Weight [lb (kg)]	0.5 (0.23)

Model	Lens Diameter (mm)	Edge Thickness		Mounting Thread
Model	Lens Diameter (mm)	Min. (mm)	Max. (mm)	Mounting Thread
B6	6	1	6	M20.25 RMS
B6.35	6.35	1.2	3.5	M20.25 RMS
B10	10	0.8	6	M20.25 RMS
B12.5	12.5	0.8	6	M20.25 RMS
B12.7	12.7	1.2	5	M20.25 RMS
B18-15.5	18	1.2	8	M20.25 RMS
B18-26	18	1.2	8	M20.25 RMS
B18-56	18	1.2	8	M20.25 RMS
B25.4	25.4	1.6	10	M30 x 0.75
B31.5	31.5	1.6	11	M35 x 0.75
B38.1	38.1	1.6	14	M45 x 0.75
B40	40	1.6	14	M45 x 0.75
B50	50	1.6	20	M55 x 0.75
B50.8	50.8	1.6	20	M55 x 0.75
B63	63	2.2	21	M68 x 0.75
B76.2	76.2	1.2	23	M85 x 0.75

Model	Lens Dimensions B x H (mm)	Mounts in
B06-25	6.35 x 25.4	B50
B12-25	12.7 x 25.4	B50
B25-51	25.4 x 50.8	B76.2
B51-51	50.8 x 50.8	B80
B60-15	15 x 60	B80
B60-20	20 x 60	B80
B60-30	30 x 60	B80
B60-50	50 x 60	B80

Model	Description	Lens Diameter (mm)	Mounting Thread
B20-RMS	Focusing Barrel	20	M20.25 RMS
B25.4-RT	Rotation Barrel	22	M30 x 0.75
B-EY-23.2	Microscope Eyepiece Barrel, 23.2 mm		M30 x 0.75
B-EY-27	Microscope Eyepiece Barrel, 27 mm		M35 x 0.75
B25.4-F	25.4 mm Mirror/Lens Adaptor	25.4	M20.25 RMS
BA20RMS-M25	RMS-Thread Adaptor		M20.25 RMS
BA20RMS-M30	RMS-Thread Adaptor		M20.25 RMS
BA20RMS-M35	RMS-Thread Adaptor		M20.25 RMS
BA20RMS-M45	RMS-Thread Adaptor		M20.25 RMS
BA20RMS-M55	RMS-Thread Adaptor		M20.25 RMS
BA20RMS-M68	RMS-Thread Adaptor		M20.25 RMS

Model	Metric Model	For Lens Barrel	Thread	Optic Diameter (mm)
SB19.18	M-SB19.18	B18	M20.25 RMS	18
SB19.22.4	M-SB19.22.4	B19 and B22.4	M25 x 0.75	19.05
SB19.25.4	M-SB19.25.4	B25.4	M30 x 0.75	25.4
SB19.31.5	M-SB19.31.5	B31.5	M35 x 0.75	31.5
SB32.18	M-SB32.18	B18	M20.25 RMS	18
SB32.22.4	M-SB32.22.4	B19 and B22.4	M25 x 0.75	19.05
SB32.25.4	M-SB32.25.4	B25.4	M30 x 0.75	25.4
SB32.31.5	M-SB32.31.5	B31.5	M35 x 0.75	31.5
SB32.40	M-SB32.40	B38.1 and B40	M45 x 0.75	38.1
SB32.50	M-SB32.50	B50 and B50.8	M55 x 0.75	50
SB63	M-SB63	B63	M68 x 0.75	63
SB80	M-SB80	B76.2 and B80	M85 x 0.75	76.2
SB100	M-SB100	B95, B100, B101.6	M105 x 0.75	101.6

Model	Thread
CB26.18	M20.25 RMS
CB26.22.4	M25 x 0.75
CB26.25.4	M30 x 0.75
CB26.31.5	M35 x 0.75
CB26.CM	C Mount
CB26.40	M45 x 0.75
CB26.50	M55 x 0.75
CB26.63	M68 x 0.75
CS26	Bellows

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
B12.7	B Series Lens Mount Barrel, X26 Mounts, 12.7mm, M20.25 RMS	0	In Stock	74	$74.99	ADD
B18-15.5	B Series Lens Mount Barrel, X26 Mounts, 18mm, M20.25 RMS	2	2 Weeks	74	$74.99	ADD
B18-26	B Series Lens Mount Barrel, X26 Mounts, 18mm, M20.25 RMS, 26mm long	5	5 Weeks	84	$84.99	ADD
B20-RMS	X26 Focusing Barrel, B Series	0	In Stock	119	$119.99	ADD
B25.4	B Series Lens Mount Barrel, X26 Mounts, 25.4mm, M30 x 0.75	0	In Stock	91	$91.99	ADD
B25.4-F	X26 Mirror/Lens Adaptor, 25.4mm Diameter, B Series	5	5 Weeks	61	$61.99	ADD
B25.4-RT	X26 Rotation Barrel, B Series	4	4 Weeks	119	$119.99	ADD
B38.1	B Series Lens Mount Barrel, X26 Mounts, 38.1mm, M45 x 0.75	6	6 Weeks	108	$108.99	ADD
B40	B Series Lens Mount Barrel, X26 Mounts, 40mm, M45 x 0.75	4	4 Weeks	112	$112.99	ADD
B50	B Series Lens Mount Barrel, X26 Mounts, 50mm, M55 x 0.75	5	5 Weeks	132	$132.99	ADD
B50.8	B Series Lens Mount Barrel, X26 Mounts, 50.8mm, M55 x 0.75	0	In Stock	157	$157.99	ADD
B6.35	B Series Lens Mount Barrel, X26 Mounts, 6.35mm, M20.25 RMS	6	6 Weeks	74	$74.99	ADD
B76.2	B Series Lens Mount Barrel, X26 Mounts, 76.2mm, M85 x 0.75	6	6 Weeks	157	$157.99	ADD
CB26.18	CB Lens Barrel Holder, M20.25 RMS, X26	5	5 Weeks	142	$142.99	ADD
CB26.25.4	CB Lens Barrel Holder, M30x0.75, X26	4	4 Weeks	142	$142.99	ADD
M-SB19.18	SB Series Objective Lens Mount, M20.25 RMS, Optical Axis Height 19.5mm, metric	7	7 Weeks	164	$164.99	ADD
M-SB19.25.4	SB Series Lens Mount, M30x0.75, Optical Axis Height 19.5mm, metric	7	7 Weeks	164	$164.99	ADD
M-SB32.25.4	SB Series Lens Mount, M30x0.75, Optical Axis Height 32.5mm, metric	5	5 Weeks	178	$178.99	ADD
M-SB32.50	SB Series Lens Mount, M55x0.75, Optical Axis Height 32.5mm, metric	7	7 Weeks	229	$229.99	ADD
SB19.18	SB Series Objective Lens Mount, 0.800-36, Optical Axis Height 19.5mm	7	7 Weeks	164	$164.99	ADD
SB19.25.4	SB Series Lens Mount, M30x0.75, Optical Axis Height 19.5mm	7	7 Weeks	164	$164.99	ADD
SB32.18	SB Series Objective Lens Mount, 0.800-36, Optical Axis Height 32.5mm	7	7 Weeks	178	$178.99	ADD
SB32.25.4	SB Series Lens Mount, M30x0.75, Optical Axis Height 32.5mm	7	7 Weeks	178	$178.99	ADD
SB32.50	SB Series Lens Mount, M55x0.75, Optical Axis Height 32.5mm	0	In Stock	229	$229.99	ADD

Model B18 to B101.6

	Dimensions [in. (mm)]			Thread	Dimensions [in. (mm)]
Model	A	B Min	B Max	C	D	E	e	F	H	K	L
B18-15.5	0.71 (18)	0.05 (1.2)	0.31 (8)	0.800-36 (M20.25 RMS)	0.94 (24)	0.17 (4.25)	0.02 (0.5)	0.67 (17)	0.61 (15.5)	0.24 (6)	0.22 (5.5)
B18-26	0.71 (18)	0.05 (1.2)	0.31 (8)	0.800-36 (M20.25 RMS)	0.94 (24)	0.17 (4.25)	0.02 (0.5)	0.67 (17)	1.02 (26)	0.24 (6)	0.22 (5.5)
B18-38	0.71 (18)	0.05 (1.2)	0.31 (8)	0.800-36 (M20.25 RMS)	0.94 (24)	0.17 (4.25)	0.02 (0.5)	0.67 (17)	1.50 (38)	0.24 (6)	0.22 (5.5)
B18-56	0.71 (18)	0.05 (1.2)	0.31 (8)	0.800-36 (M20.25 RMS)	0.94 (24)	0.17 (4.25)	0.02 (0.5)	0.67 (17)	2.20 (56)	0.24 (6)	0.22 (5.5)
B19	0.75 (19.05)	0.05 (1.2)	0.31 (8)	M25 x 0.75	1.14 (29)	0.17 (4.25)	0.02 (0.5)	0.71 (18)	0.61 (15.5)	0.24 (6)	0.22 (5.5)
B22.4	0.88 (22.4)	0.05 (1.2)	0.31 (8)	M25 x 0.75	1.14 (29)	0.17 (4.25)	0.02 (0.5)	0.83 (21)	0.61 (15.5)	0.24 (6)	0.22 (5.5)
B25.4	1.00 (25.4)	0.06 (1.6)	0.39 (10)	M30 x 0.75	1.34 (34)	0.20 (5)	0.03 (0.75)	0.94 (24)	0.61 (15.5)	0.24 (6)	0.26 (6.5)
B31.5	1.24 (31.5)	0.06 (1.6)	0.43 (11)	M35 x 0.75	1.54 (39)	0.20 (5)	0.03 (0.75)	1.18 (30)	0.69 (17.5)	0.24 (6)	0.26 (6.5)
B38.1	1.50 (38.1)	0.06 (1.6)	0.55 (14)	M45 x 0.75	1.93 (49)	0.22 (5.5)	0.03 (0.75)	1.42 (36)	0.81 (20.5)	0.26 (6.5)	0.30 (7.5)
B40	1.57 (40)	0.06 (1.6)	0.55 (14)	M45 x 0.75	1.93 (49)	0.22 (5.5)	0.03 (0.75)	1.50 (38)	0.81 (20.5)	0.26 (6.5)	0.30 (7.5)
B50	1.97 (50)	0.06 (1.6)	0.79 (20)	M55 x 0.75	2.32 (59)	0.23 (5.75)	0.03 (0.75)	1.89 (48)	1.06 (27)	0.26 (6.5)	0.30 (7.5)
B50.8	2.00 (50.8)	0.06 (1.6)	0.79 (20)	M55 x 0.75	2.32 (59)	0.23 (5.75)	0.03 (0.75)	1.93 (49)	1.06 (27)	0.26 (6.5)	0.30 (7.5)
B63	2.48 (63)	0.09 (2.2)	0.83 (21)	M68 x 0.75	2.91 (74)	0.24 (6)	0.04 (1)	2.40 (61)	1.08 (27.5)	0.33 (8.5)	0.35 (9)
B76.2	3.00 (76.2)	0.05 (1.2)	0.91 (23)	M85 x 0.75	3.70 (94)	0.28 (7)	0.04 (1)	2.91 (74)	1.14 (29)	0.33 (8.5)	0.35 (9)
B80	3.15 (80)	0.05 (1.2)	0.91 (23)	M85 x 0.75	3.70 (94)	0.28 (7)	0.04 (1)	3.07 (78)	1.14 (29)	0.33 (8.5)	0.35 (9)
B95	3.74 (95)	0.06 (1.6)	1.06 (27)	M105 x 0.75	4.69 (119)	0.25 (6.25)	0.03 (0.75)	3.66 (93)	1.36 (34.5)	0.33 (8.5)	0.35 (9)
B100	3.94 (100)	0.06 (1.6)	1.06 (27)	M105 x 0.75	4.69 (119)	0.25 (6.25)	0.03 (0.75)	3.86 (98)	1.36 (34.5)	0.33 (8.5)	0.35 (9)
B101.6	4.00 (101.6)	0.06 (1.6)	1.06 (27)	M105 x 0.75	4.69 (119)	0.25 (6.25)	0.03 (0.75)	3.90 (99)	1.36 (34.5)	0.33 (8.5)	0.35 (9)

Models B6.35 and B12.7

	Dimensions [in. (mm)]
Model	A	B	F	H
B6.35	0.25 (6.35)	0.05–0.14 (1.2–3.5)	0.20 (5)	0.24 (6)
B12.7	0.50 (12.7)	0.05–0.20 (1.2–5)	0.43 (11)	0.31 (8)

SB Series

	Thread		Dimensions [in. (mm)]
Model (Metric)	A	B	C	D	E
SB19– (M-SB19–)	4-40 (M3)	1/4-20 (M6)	0.33 (8.5)	0.77 (19.5)	1.93 (49)
SB32– (M-SB32–)	4-40 (M3)	1/4-20 (M6)	0.49 (12.5)	1.28 (32.5)	3.11 (79)
M-SB63	M3	M6	0.55 (14)		3.11 (79)
SB80 (M-SB80)	4-40 (M3)	1/4-20 (M6)	0.55 (14)		4.25 (108)
M-SB100	M3	M6	0.55 (14)		5.04 (128)

	Thread
Model (Metric)	F
SB19.18	0.800-36 (M20.25 RMS)
SB19.22.4	M25 x 0.75
SB19.25.4	M30 x 0.75
M-SB19.31.5	M35 x 0.75
SB32.18	0.800-36 (M20.25 RMS)
SB32.22.4	M25 x 0.75
SB32.25.4	M30 x 0.75
M-SB32.31.5	M35 x 0.75
SB32.40	M45 x 0.75
SB32.50	M55 x 0.75
M-SB63	M68 x 0.75
SB80	M85 x 0.75
M-SB100	M105 x 0.75

Model B6/8/10/12.5

Model B06-25 to B60-50

	Dimensions [in. (mm)]
Model	B	H
B06-25	0.25 (6.35)	1.00 (25.4)
B12-25	0.50 (12.7)	1.00 (25.4)
B25-51	1.00 (25.4)	2.00 (50.8)
B51-51	2.00 (50.8)	2.00 (50.8)
B60-15	0.59 (15)	2.36 (60)
B60-20	0.79 (20)	2.36 (60)
B60-30	1.18 (30)	2.36 (60)
B60-50	1.97 (50)	2.36 (60)

Model B20-RMS

Model B-EY

	Thread	Dimensions [in. (mm)]
Model	A	B
B-EY-23.2	M30 x 0.75	0.91 (23.2)
B-EY-27	M35 x 0.75	1.06 (27)

Model BA20RMS

	Thread	Diameter [in. (mm)]
Model	A	B
BA20RMS-M25	M25x0.75	1.18 (30)
BA20RMS-M30	M30x0.75	1.38 (35)
BA20RMS-M35	M35x0.75	1.57 (40)
BA20RMS-M45	M45x0.75	1.97 (50)
BA20RMS-M55	M55x0.75	2.36 (60)
BA20RMS-M68	M68x0.75	2.91 (74)