New Canon super telephoto lenses, specifically the RF 400mm and RF 600mm, are rumored to be hitting shelves in May. This report from Canon Rumors suggests these optics will serve as a refresh of the beloved ‘Big White’ series.
If the rumors hold water, photographers waiting for updated glass in the RF mount have a specific release window to mark on their calendars. The focal lengths of 400mm and 600mm promise to fill gaps between existing options without necessarily replacing current models entirely.
Canon Rumors frames this drop as an evolution rather than a total overhaul, hinting that key design elements from the legacy ‘Big White’ might survive while internal optics get a modern update. That approach could appeal to pros who need reliability alongside performance gains.
Take this with a grain of salt, but the timing aligns perfectly with Canon’s usual pattern of refreshing their high-end telephoto lineup after several years. We are expecting details on pricing and weight soon if these reports are accurate.
Even if Canon does issue a development announcement for these “big white lenses,” I believe it is unlikely that we will get wind of the information prior to the official announcement itself. Any leaks would likely surface only a day or two beforehand. B&H Photo currently lists a projected arrival date of April 13, 2026, for new products; however, such dates rarely turn out to be accurate.
Given that Canon’s RF400mm F2.8L and RF600mm F4L lenses inherited their optical systems from their EF-mount predecessors—meaning their optical designs are now quite dated—it would come as no surprise to see them undergo a model refresh at this stage. It will be fascinating to see whether the new models follow the recent trend in telephoto lenses by prioritizing a more compact and lightweight design, or if they instead focus on enhanced convenience through the inclusion of built-in teleconverters.
Canon RF 400mm and RF 600mm lenses Specifications
| Feature | Specification |
|---|---|
| Mount | RF |
| Focal Lengths | 400mm, 600mm |
via: CR