Canon EF 300mm f/4L IS USM Telephoto Fixed Lens for Canon SLR Cameras - 2530A004

Product Information

As such, it not only becomes the mirrorless replacement for the EF 300mm f2.8L II from 2011, but also arguably an alternative to the EF 200-400mm f4, especially as the new lens will work with Canon’s existing RF teleconverters to extend its reach.Add the RF 1.4x TC and the 100-300 2.8 becomes a 140-420 f4.Add the RF 2x TC and it becomes a 200-600mm f5.6, which could be useful for more distant sports or even wildlife. Let’s now switch the EF 300 at the top for the old EF 200-400 zoom, before adding the hood and again the R3 via an adapter. If the available wall space is minimal, consider a vertical radiator to maximise this, or even look at the spaces under windows if that is an option.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet Measuring 84mm in diameter and 187mm in length, the Tokina 300mm f/4 is a small lens. In comparison, the Nikon 300mm f/4D AF-S with its 90mm diameter and 222.5mm length is a lot bigger. It also weighs 300 grams more than the Tokina. The Canon EF 300mm f/4 L USM (The non-Image-Stabilized model from 1991 and the IS model from 1997) lenses from the 90’s compare favorably with the Tokina in weight, but their size is almost identical to that of the Nikon lens. The only 300mm f/4 full-frame lens that handily beats the Tokina in size is the relatively new Nikon 300mm f/4E PF ED VR lens whose usage of Phase Fresnel (PF) elements make it a tiny 147.5mm in length and just 755grams. Thanks to its small size and form factor, the Tokina balances effortlessly on even the smallest of DSLR’s which makes it a fantastic companion for long hikes. And finally, the new RF 100-300 in various configurations, first the lens by itself, now with the supplied hood attached, and next with the EOS R3 body mounted. The Canon RF 100-300mm f2.8L IS USM is a high-end telephoto zoom for the EOS R mirrorless system, aimed at indoor or close-range sports, or where you need a little more reach than a 70-200, like at red-carpet events. Focusing is courtesy of dual nano USM motors and an overlapping floating design. The lens also supports focus breathing compensation and minimises focus shift when zooming, albeit not officially parfocal.

Autofocus

The optical formula is comprised of 20 elements in 16 groups, including one ED and three Super ED elements to reduce chromatic aberrations. Consequently, in use it feels well matched even to a small body like the Sony A1 camera, as shown in the photos below, although fitting a vertical battery grip definitely helps with the overall balance.

Each grade has adequate strength to support a specified depth of wet concrete during construction and will collapse under its specified fail-load, limiting the upward presssures experienced periods od clay heave. Sealing: All three lenses in this comparison have a rubber grommet at the lens-mount plus further weather-sealing throughout the construction. [+] Weighing in at 1470g (excluding tripod mount), the magensium alloy bodied Sony FE 300mm F2.8 GM OSS is officially the lightest 300mm F2.8 prime lens on the market, for any manufacturer and for both mirrorless and DSLR systems, although with dimensions of 265mm in length and 124mm in diameter, it is slightly larger than the Nikon and Canon equivalents. Canon quotes the IS system as delivering up to 5.5 stops by itself or up to six when used with a body sporting IBIS.

Tamron 18-300mm F/3.5-6.3 Di III-A VC VXD Image Quality

Of course the more detailed comparison you want to see is between the old EF 300 2.8L II, seen here on the left and the new RF 100-300 f2.8L on the right. Consider the size of the room, as larger spaces will likely require radiators with a higher heat output or maybe even multiple radiators in some cases. If unsure, try our heating calculator, which will help narrow down your search. Next the RF 400 2.8 super-tele prime lens which can mount natively to the EOS R3, although I couldn’t fit the hood into the frame. This is followed by switches to limit the distance from 6m to infinity, select manual or autofocus, enable the optical image stabiliser, and choose the actual stabilisation mode. These are narrow radiators of various heights that can fit into compact spaces and still yield plenty of warmth with enough height and the right configuration. Quality is assured from leading manufacturers and you have enough style options to find the right look for your space. Do You Sell Different Styles Of 300mm Wide Radiators?