XH CONVERTER 0,8

[BobShaw]

XH CONVERTER 0,8

Verbatim from https://www.hasselblad.com/x-system-accessories/xh-converter-0-8/
 
"The XH Converter 0,8 brings new opportunities to Hasselblad photographers with the ability to unlock a whole new set of H System lens capabilities. The XH Converter 0,8, used on HC/HCD lenses attached to an X System or 907X camera, reduces the focal length of the lens by a factor of 0,8x, which delivers a wider field of view and improves the maximum aperture of the lens by two-thirds of a stop. Additionally, the XH Converter 0,8 improves lens performance in terms of contrast and apparent sharpness across the entire frame. 
 
An impressive combination for maximizing aperture is achieved when attaching the XH Converter 0,8 to the HC f/2,2 100mm lens, transforming the aperture and focal length to f/1,8 and 80mm, respectively. This creates an extremely large aperture that proves even faster than the XCD f/1,9 80mm lens, which until now has been the highest aperture lens option for X and 907X camera systems. An example of reducing focal length with the XH Converter 0,8 is when combined with the HCD f/4,8 24mm lens, it creates an aperture of f/3,8 with a 19mm focal length. This results in an even wider lens option than the existing XCD 21 lens, the widest lens in the X System."

[JaapD]

A 0.8 converter improving lens performance? That doesn’t look right. Such converter consists of one or more lenses, each with glass-air surfaces resulting in reduced contrast. This can be minimized by coatings but never result in an actual improvement.

Same with sharpness, adding the converter’s lens elements in the optical path does not improve the sharpness of the original lens, but reduces it, less or more.

Apart from this it still looks like an interesting and useful piece of glass.

Cheers,
Jaap.

[BobShaw]

A 0.8 converter improving lens performance? That doesn’t look right. Such converter consists of one or more lenses, each with glass-air surfaces resulting in reduced contrast. This can be minimized by coatings but never result in an actual improvement.

Same with sharpness, adding the converter’s lens elements in the optical path does not improve the sharpness of the original lens, but reduces it, less or more.

Apart from this it still looks like an interesting and useful piece of glass.

Cheers,
Jaap.

I think it means that as the image is made smaller then imperfections are also made smaller.

[Joe Towner]

As if medium format DoF needed any help