New Cambo Actar 90mm – Stitching Images
We’re back out on location at one of our favourite spots, to show comparison captures using the new Actar lenses. This time we are using the Actar 90mm f4 lens, which has a very large image circle of 90mm.
As with all Actar lenses the 90mm is supplied fitted with a lens plate that slots directly in the front standard of the Cambo Actus camera platform. It is compatible with Mirrorless and DSLR camera systems. The large image circle of 90mm enables you to shift the camera body 27mm left and 27mm right, a huge 54mm shift. For my test we captured an image with 20mm shift left and right, producing a very nice, sharp, wide and distortion free image.
Again you need to find the infinity of the lens but this is easier to achieve as its a longer lens. Weather permitting our next location shoot will explain this process.
For this test we used the following; Cambo Actus Mini View Camera, Sony A7R, Actar 90mm lens, Standard bellows, CBH-6 ball and socket head and Manfrotto 055 CF tripod.
Using the Sony to meter the exposure at ISO50 was 1/8th sec at F16. The RAW file was captured with the generic Sony profile and a 2 second self timer was used to avoid camera shake.
Having used Capture One with Leaf digital backs, its very easy to process the Sony RAW files with Capture One Sony Express. I tweaked the exposure +0.3 and selected the Sony Generic profile, this time I chose 8Bit Adobe RGB file output and saved each file as a TIFF to preserve the data. Capture One pre-set sharpening was used, there was no need to increase this as the images were already sharp.
The Photoshop layered file stitched is 870.7MB, the image file size is 188.3MB. The pixel size dimension of the capture is 13422 x 4904 at 300dpi / Print output 44.74” x 16.35” 300dpi.
The Photoshop CC2015 auto merge, content aware and edge fill process was the same as when we processed the Actar 24 and 60mm files. Having used Photoshop since v1 the workflow process is incredibly slick, especially when using MacBook Pro with SSD drives.
The images we use for the blog are 1080 wide at 72dpi, reduced to manage on the blog.
Image quality from the 90mm is very good. As you can see from the cropped image, this is 100% zoom, its sharp and the colour is good. More importantly I didn’t find any lens aberration, commonly known as colour fringing, from the middle to the edge of the frame.
We’ll be shooting products next and will publish our results on the blog soon. So sign up and don’t miss a post. For further information about Cambo products contact your nearest dealer– Dealer Search.