This rather depends on the surface finish needed. Grinding can get down to a surface finish of a few microns - essentially a mirror finish, needed for such commodity things as dies for making chocolate or soap.
Otherwise, cutter machining may be appropriate.
If the work piece has been hardened, then grinding may be the only method available.
The maximum focal length of the Nikon DX 55-200mm lens is 200mm.
Its almost the length of your hand.
The zoom equivalent of a 200mm lens is approximately 8x zoom.
Lenses with a focal length of 200mm have a shorter reach compared to lenses with a focal length of 300mm. This means that the 300mm lens can capture subjects that are farther away in greater detail, while the 200mm lens is better suited for subjects that are closer. The 300mm lens also provides a narrower field of view compared to the 200mm lens.
The focal length range for a Nikon 18 200mm VR is very broad. The focal length is eighteen to two hundred millimeters wide. The magnification is equivalent to eleven point one times the power.
The best lens options for the Sony a6000 with an 18-200mm focal length range are the Sony E 18-200mm f/3.5-6.3 OSS and the Tamron 18-200mm f/3.5-6.3 Di III VC. These lenses offer a versatile zoom range for various shooting situations and have image stabilization for sharper photos.
600,000mm
200mm = 20cm
Using a camera lens with a 200mm focal length for capturing distant subjects offers advantages such as magnifying the subject, creating a shallow depth of field for a blurred background, and reducing distortion in the image.
The best Nikon DX lenses for capturing images at a focal length range of 55-200mm are the Nikon AF-S DX NIKKOR 55-200mm f/4-5.6G ED VR II and the Nikon AF-P DX NIKKOR 70-300mm f/4.5-6.3G ED VR.
20cm=200mm
An 18-55mm lens has a shorter focal length range, making it better for wide-angle shots and general photography. A 55-200mm lens has a longer focal length range, allowing for closer shots of distant subjects like wildlife or sports. The 55-200mm lens is more versatile for capturing subjects at a distance, while the 18-55mm lens is better for everyday photography.