延伸環是使用於微距取像的輔助器材，每顆鏡頭規格都有至近距離的限制，使用延伸環使鏡頭有微距取像的能力，而安裝延伸環只需在相機及鏡頭之間即可

安裝位置

 

表的參考

相機感應器尺寸

Sensor size (inch)	1"	1/1.2"	2/3"	1/1.8"	1/2"	1/3"
Sensor size (mm)	12.8 × 9.6	10.72 × 8.04	8.8 × 6.6	7.2 × 5.4	6.4 × 4.8	4.8 × 3.6

 

Ex Tube (mm)	型號	JHF35M-5MP		JHF25M-5MP		JHF16M-5MP		JHF12M-5MP		JHF8M-5MP
		JHF35M-MP		JHF25M-MP		JHF16M-MP		JHF12M-MP
	M.O.D	0.25m		0.2m		0.2m		0.15m		0.1m
0.5	WD	230.0	2454.7	172.5	1244.2	146.1	490.5	98.1	281.8	50.6	118.7
	2/3"	53.3 × 40.0	616.2 × 462.1	60.7 × 45.5	440.2 × 330.1	78.4 × 58.8	281.7 × 211.3	73.2 × 54.9	211.4 × 158.6	65.3 × 49.0	142.2 × 106.6
	1/1.8"	43.6 × 32.7	504.1 × 378.1	49.7 × 37.3	360.1 × 270.1	64.1 × 48.1	230.5 × 172.9	59.9 × 44.9	173.0 × 129.7	53.4 × 40.1	116.3 × 87.2
	1/2"	38.8 × 29.1	448.1 × 336.1	44.2 × 33.1	320.1 × 240.1	57.0 × 42.7	204.9 × 153.7	53.2 × 39.9	153.8 × 115.3	47.5 × 35.6	103.4 × 77.5
	1/3"	29.1 × 21.8	336.1 × 252.1	33.1 × 24.8	240.1 × 180.1	42.7 × 32.1	153.7 × 115.2	39.9 × 29.9	115.3 × 86.5	35.6 × 26.7	77.5 × 58.2
1	WD	213.0	1229.1	151.5	618.8	114.8	234.2	72.1	137.5	31.5	53.4
	2/3"	49.4 × 37.0	308.1 × 231.1	53.5 × 40.1	220.1 × 165.1	62.0 × 46.5	140.9 × 105.6	54.9 × 41.2	105.7 × 79.3	45.2 × 33.9	71.1 × 53.3
	1/1.8"	40.4 × 30.3	252.1 × 189.0	43.8 × 32.8	180.1 × 135.0	50.7 × 38.0	115.2 × 86.4	44.9 × 33.7	86.5 × 64.9	37.0 × 27.8	58.2 × 43.6
	1/2"	35.9 × 26.9	224.1 × 168.0	38.9 × 29.2	160.1 × 120.0	45.7 × 33.8	102.4 × 76.8	39.9 × 29.9	76.9 × 57.7	32.9 × 24.7	51.7 × 38.8
	1/3"	26.9 × 20.2	168.0 × 126.0	29.2 × 21.9	120.0 × 90.0	33.8 × 25.4	76.8 ×  57.6	29.9 × 22.5	57.7 × 43.2	24.7 × 18.5	38.8 × 29.1
2	WD	185.6	616.3	121.7	306.1	79.8	106.1	46.2	65.4	15.1	20.8
	2/3"	43.0 × 32.2	154.0 × 115.5	43.2 × 32.4	110.0 × 82.5	43.7 × 32.8	70.4 × 52.8	36.6 × 27.4	52.9 × 39.6	28.0 × 21.0	35.5 × 26.7
	1/1.8"	35.1 × 26.4	126.0 × 94.5	35.3 × 26.5	90.0 × 67.5	35.8 × 26.8	57.6 × 43.2	29.9 × 22.5	43.2 × 32.4	22.9 × 17.2	29.1 × 21.8
	1/2"	31.2 × 23.4	112.0 × 84.0	31.4 × 23.6	80.0 × 60.0	31.8 × 23.8	51.2 × 38.4	26.6 × 20.0	38.4 × 28.8	20.4 × 15.3	25.8 × 19.4
	1/3"	23.4 × 17.6	84.0 × 63.0	23.6 × 17.7	60.0 × 45.0	23.8 × 17.9	38.4 × 28.8	20.0 × 15.0	28.8 × 21.6	15.3 × 11.5	19.4 × 14.5
5	WD	134.2	248.6	75.8	118.5	-
	2/3"	30.9 × 23.2	61.6 × 46.2	27.4 × 20.6	44.0 × 33.0
	1/1.8"	25.3 × 19.0	50.4 × 37.8	22.4 × 16.8	36.0 × 27.0
	1/2"	22.5 × 16.9	44.8 × 33.6	19.9 × 14.9	32.0 × 24.0
	1/3"	16.9 × 12.6	33.6 × 25.2	14.9× 11.2	24.0 × 18.0
10	WD	92.2	126.0	45.7	55.9	-
	2/3"	21.1 × 15.8	30.8 × 23.1	17.0 × 12.8	22.0 × 16.5
	1/1.8"	17.2 × 12.9	25.2 × 18.9	13.9 × 10.4	18.0 × 13.5
	1/2"	15.3 × 11.5	22.4 × 16.8	12.4 × 9.3	16.0 × 12.0
	1/3"	11.5 × 8.6	16.8 × 12.6	9.3 × 7.0	12.0 × 9.0
22	WD	53.3	59.2	-
	2/3"	11.9 × 9.0	14.0 × 10.5
	1/1.8"	9.8 × 7.3	11.5 × 8.6
	1/2"	8.7 × 6.5	10.2 × 7.6
	1/3"	6.5 × 4.9	7.6 × 5.7

* 使用延伸環取像時，無法保證光學的解析度
* 數據與實測取像會有一點差異，資訊僅供參考