Characterized by its ultrawide field of view, the black Canon RF-mount NiSi 9mm f/2.8 Sunstar ASPH Lens Canon RFis also distinguished by its distinct rendering of point light sources. Well-suited for landscapes, cityscapes, architecture, and interior applications, this ultrawide-angle prime strays from the norm with a 10 straight-bladed aperture design that create clear 10-point sun stars from specular highlights throughout the aperture range. Optically, this lens sports two double-sided aspherical elements and four low dispersion glass elements, which help control a variety of aberrations and distortion for high sharpness, clarity, and accurate rendering. The lens has a manual focus design with a 7.9" minimum focusing distance for working with close-up subjects.

APS-C | f/2.8 to f/16    Aperture Range: f/2.8 to f/16    Two Aspherical Elements, Two ED Elements    Manual Focus Design    10-Blade Diaphragm

Related Questions and Answers

Q: 1. There seems to be more than one lens hood offered as one seems longer than the other in the illustration. Which do we get, the longer or shorter one?

A: Canon RF 400mm f/2.8 L IS USM Lens comes with the Canon Lens Hood ET-155 (WIII) included in the box. WIch is the long version.

Q: 2. What is the horizontal and diagonal field of view?

A: The manufacturer does not provide that information. The angle of view is 113°

Q: 3. Can this lens be used on Canon R7 crop sensor?

A: Yes, the NiSi 15mm f/4 Sunstar ASPH Lens for Canon RF can be used on the Canon EOS R7 Mirrorless Camera, but there will be a crop factor of 1.6X applied to the focal length.

Q: 4. Could you please suggest any 49mm filter for this lens that gives minimal vignetting at F2.8? (For example, will B+W XS-Pro filter work?)

A: Mostly any slim/thin filter should work. The B+W XS Pro would be ideal.

Q: 5. Is this basically the EF version with an RF mount attached or is it totally a new lens with new optics, focusing motors, etc?

A: The Canon RF 400mm f/2.8 L IS USM Lens, and the Canon EF 400mm f/2.8L IS III USM Lens has the same optical design.

Q: 6. Is the lens weather sealed at all?

A: No, the NiSi 15mm f/4 Sunstar ASPH Lens for Nikon Z (Black) is not a weatherproof lens. However, the front element has a water-resistant coating; this prevents the lens from marking.

Q: 7. How does this lens compare to the LAOWA 7.5mm version? Is the loss of one stop of light work the "Zero-D" or does it have similar mimimal, yet still visible distortion of the 7.5mm.

A: The 7.5mm produces minimal distortion and this 9mm produces virtually none.

Q: 8. How does this lens perform (effect on IQ) with the 1.4 and 2 TCs?

A: When using the Canon RF 400mm f/2.8 L IS USM Lens wide open with the Canon Extender RF 1.4x, image sharpness is decreased modestly in the center in the center of the frame, but corners are nearly unaffected. Stopping down one stop brings a nice improvement and impressive sharpness across the frame. The RF 1.4x adds a slight barrel distortion but notably does not affect lateral CA. The results are a bit soft when using the Canon Extender RF 2x on the RF 400mm f/2.8. The sharpness is good across the frame if you stop down one stop. The 2x Extender increases lateral CA noticeably and barrel distortion slightly. The 2x Extender does impact sharpness and contrast.

Q: 9. Is MFT version plus MFT-to-SonyE adapter the exactly same as buying Sony E-mount version of the lens? The benefit is dual mount

A: Yes it would be the same if you use this FotodioX Lens Mount Adapter for Micro Four Third Lens to Sony E-Mount Camera https://www.bhphotovideo.com/c/product/1250652-REG/fotodiox_mft_nex_micro_four_third_lens.html

Q: 10. Does this lens come with a hard case?

A: Canon RF 400mm f/2.8 L IS USM Lens only comes with a soft case. It does not include a hard case.