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    Canon EF to RF Mount Adapter with Internal Variable ND Filter

    • 35 / Day
    • Multi-day Discount Available

    Included in rental:

    • Canon EF to RF Mount Adapter with Internal Variable ND Filter
    • Clear filter tray & case
    • EF and RF caps

    Alternatives & Add-Ons:

    As part of their transition into manufacturing mirrorless cameras, Canon has introduced a new lens mount, the RF mount.  Much like Sony’s E mount, the RF mount has a very shallow flange depth, making it feasible to use lenses from many other standards with an adapter.  Canon has manufactured over 130 million(!) EF lenses, and wants to honour their customers’ current investment in glass.  Consequently, this device adapts legacy EF lenses to the new RF standard.  It is designed to adapt full frame lenses to full frame cameras.  It will of course also work with crop sensor RF cameras such as the Canon C70, but the EF lens will be more telephoto by about 50%.   It has electrical contacts for metadata, and autofocus & exposure are fully compatible on Canon cameras.  I say “Canon” cameras because third party camera manufacturers such as RED (Komodo) and Sigma (FP) are also using the new mount.  The degree to which other manufacturers can control the electrical functions of EF lenses is not a limitation of this adapter, but rather how good their software teams are at reverse engineering Canon’s control signals.

    Adapters with this form factor from other manufacturers are essentially just a hollow “tube” with a different bayonet mount on each end.  Canon has used their optics manufacturing expertise to add a very practical extra to this adapter.  It has slide-out trays that hold a variety of filters.  The trays swap out easily and are well engineered and dust sealed.  If you just want to use the adapter as a “tube”, there is a clear glass filter tray.  Where things really get interesting though is with the insertable variable Neutral Density filter.  The tray has a small finger wheel on the exterior to turn the filter elements inside, allowing one to control the amount of light that reaches the camera sensor.  This is especially important for shooting video where one’s frame rate and shutter rate have to remain constant and are taken out of the running as a method to adjust exposure.  It has three unique advantages:

    1. Often changing the aperture on a modern mirrorless camera involves 1/3 or 1/2 light stop “steps”, and these steps are a drastic and noticeable change in exposure that is distracting to the viewer.  A variable ND eliminates these jarring steps, and since this one is controlled by your finger adjusting a mechanical wheel, it brings operator finesse back into the equation
    2. Like all variable NDs, it gives some artistic control back to the operator.  If you want to leave the aperture of your lens wide open in order to lessen your depth of field and de-focus the background of your subject, this filter allows you to do that while still being able to control exposure.  Shooting an interview and the sun comes out?  Easily make your adjustment WITHOUT affecting your depth of field and therefor your focus.
    3. One huge advantage that is overlooked with this type of variable ND is that since it is between the lens and camera body, you don’t need to buy a screw-on variable ND (in all of their different sizes, and with the potential for each one of them to get scratched) for each one of your lenses.  This makes swapping lenses in rapidly changing light scenarios much more practical.  It also allows one to put a variable ND on lenses that it may be physically impossible to otherwise such as our 8-15mm fisheye zoom.  And it allows you to make adjustments while leaving your lens hood or matte box in place.

    The adapter is $35/day by itself, but we will drop it to $25/day with an accompanying EF lens rental