Macro Zoom Lens The lens is changeable focal length without changing Working Distance. There ate 3x and 8x magnifications. One of 8x lens is with Iris.

TS-93001VS For Details ３x Macro Zoom Lens Optical Magnification： 0.133 - 0.400 x Working Distance： 200.00mm TS-93002Ni For Detail 8x Macro Zoom Lens with Iris Optical Magnification： 0.100 - 0.800 x Working Distance： 200.00mm TS-93003Ni For Detail 8x Macro Zoom Lens with Iris Optical Magnification： 0.650 - 5.200 x Working Distance： 36.50mm TS-93004 For Detail 3x Macro Zoom Lens with Iris Optical Magnification：1.0 - 3.0 x Working Distance：24.7mm TS-93005 For Detail 8x Macro Zoom Lens Optical Magnification： 0.800 - 6.400 x Working Distance： 83.00mm TS-93006 For Detail 8x Macro Zoom Lens Optical Magnification： 0.500 - 4.000 x Working Distance： 132.20mm TS-93007 For Detail 8x Macro Zoom Lens Optical Magnification： 0.250 - 2.000 x Working Distance： 249.44mm TS-93022 For Detail 8x Macro Zoom Lens Optical Magnification： 0.380 - 3.000 x Working Distance： 170.10mm