ISO 12233 resolution chart results for extenders have been added to the Canon EF 28-300mm f/3.5-5.6L IS USM Lens Review
According to Canon, the EF 28-300mm f/3.5-5.6L IS USM Lens is not compatible with extenders. Not fully compatible is correct, but ... extenders can indeed be used with this lens as proven by the 420mm and 600mm ISO 12233 chart results in this review.
If the 28-300 L is zoomed out to 50mm or longer, the rear element retracts into the lens far enough for the Canon 1.4x and 2x extenders to physically mount onto the lens. Once installed, zooming in to 50mm will result in physical contact between the front of the extender (likely the rubber ring surrounding the glass lens element) and the rear element of the lens. You obviously want to avoid this.
You will also likely want to avoid the image quality that the Canon EF 2x III Extender
combo delivers at 600mm. The results are not pretty. At 600mm, this is an f/11 max aperture lens that will not AF even on a 1-Series body (tried it - AF didn't work). Better, but still not impressive are the results with the Canon EF 1.4x III Extender
at 420mm where this is an f/8 max aperture lens. Autofocusing with the 1.4x attached is very, very slow and very frequently fails completely on the EOS 1Ds III being used for testing.
The extender and lens combo's focal length reported properly in EXIF, but the aperture did not.
Excerpt from Calumet (UK) release
Jessops, with many stores and a long heritage had a strong impact in promoting photography to the general public. Although they were a major competitor of Calumet, the fact that they enabled many photographers to handle products within a showroom environment across so many cities in the UK contributed to the incredible increase in the popularity and use of digital SLR cameras in recent years. We of course have the greatest sympathy and respect for the staff, and wish them well in the future. For Jessops’ customers who have been left with unfulfilled orders or issues with manufacturers’ warranty repairs we also sympathise.
With regard to the latter, we would like to offer any Jessops customer who needs to return a product to a manufacturer under warranty for repair the opportunity to use one of our eight nationwide showrooms. The store will handle the dispatch and return along with the necessary paperwork. Please contact your closest store if you wish to discuss taking advantage of this service. We guarantee not to charge any administration fee for this facility.
Read the entire release here
In 2009, official White House photographer Pete Souza
made history when he created the first presidential portrait ever created with a digital camera (a Canon EOS 5D Mark II).
This time around, Souza used a Canon EOS 5D Mark III
and an EF 85mm f/1.2L USM lens
set to f/7.1, 1/125 second, ISO 200 for the president's second term official portrait