They don t have any glass or electronics so they have no bearing on the optical quality or features like autofocus.
Step up step down rings photography.
Fotasy anodized black metal filter step down ring set stepping lens adapter rings 82 77mm 77 72mm 72 67mm 67 62mm 62 58mm 58 55mm 55 52mm 52 49mm step down rings 4 5 out of 5 stars 181 9 49.
There are usually used to mount accessories.
Step down ring top and step up ring bottom.
When using step down rings and filters one can notice a lot of vignetting.
For example they allow you to attach a 52mm filter to a lens with a 72mm thread size.
1 things worth knowing about step up step down rings.
Why and when you need a step down ring.
All step up or step down rings do is adapt the diameter of the filter to match the lens diameter.
These adapters known as step up and step down rings allow filters designed to fit one size of lens to be adapted to lenses with larger or smaller filter thread sizes.
They enable you to adapt filter and lens accessories with smaller thread sizes to lenses with larger thread sizes.
A ring that is larger on the filter side than it is on the lens side is known as a step up ring while a ring that is larger on the lens side than it is on the filter side is known as a step down ring.
Stepping ring screws onto camera filter screws onto stepping ring.
Step down rings do the exact opposite of a step up ring.
Basically the corners are getting less light because of the tunnel that is created.