Going by the recommended lenses for the Canon 5DS that Canon published I purchased the EF24-70mm f4L IS USM for mainly landscape use I didnt need f2.8.
This was back in September 2015 and Ive never been entirely blown away by the results so whilst conducting other tests yesterday using one of Canon Cine lenses I mounted this lens on the 5DS and shot some tests on an Essar Test Chart Sphere using a CIPA High resolution chart. The Sphere provides complete even field illumination and the chart is back-lit. Test are carried out in a dark room with the Essar Sphere providing the only light. For video we can show the results on a cinema sized screen (55ft diagonal) in 4K. For this particular test the images were processed in Light Room and viewed on a 27" 4K monitor again in a darkened room.
The test showed two problems a. image shift and b. softness even centre frame at its optimum f8 on a Canon 5DS full resolution raw file at 50mm. The results were marginally better at 70mm and 24mm but certainly the limiting factor in accessing the full resolution the 5DS can acheive. CA were not well controlled.
Maybe this is a rouge lens but Photozone. de had exactly the same issues when they tested the lens a number of years ago so why Canon thinks this lens is suitable for the 5DS / r is beyond me.
This was back in September 2015 and Ive never been entirely blown away by the results so whilst conducting other tests yesterday using one of Canon Cine lenses I mounted this lens on the 5DS and shot some tests on an Essar Test Chart Sphere using a CIPA High resolution chart. The Sphere provides complete even field illumination and the chart is back-lit. Test are carried out in a dark room with the Essar Sphere providing the only light. For video we can show the results on a cinema sized screen (55ft diagonal) in 4K. For this particular test the images were processed in Light Room and viewed on a 27" 4K monitor again in a darkened room.
The test showed two problems a. image shift and b. softness even centre frame at its optimum f8 on a Canon 5DS full resolution raw file at 50mm. The results were marginally better at 70mm and 24mm but certainly the limiting factor in accessing the full resolution the 5DS can acheive. CA were not well controlled.
Maybe this is a rouge lens but Photozone. de had exactly the same issues when they tested the lens a number of years ago so why Canon thinks this lens is suitable for the 5DS / r is beyond me.