The Godox V1 has an incompatibility with EOS R series cameras. In which High Speed Sync and E-TTL don't work. There may be more incompatibles so rent a camera to check before buying the camera. Canon can't guarantee compatibly with 3rd party items. Full Frame bodies and the EOS R7 don't have a built-in flash.
- EOS: Electro Optical System (What EOS stands for)
- EF: Electronic Focus: lens mount ALL EOS DSLRs & Film SLRs use (original EOS Mount) (Red Circle Mounting Index, 12 o’clock position)
- EF-S: A separate lens Mount designed for APS-C DSLRs NOT compatible and won’t mount to any Full Frame Digital, 35mm Film SLRs or APS-H DSLRs. Note this is a DSLR Crop Sensor ONLY Mount. (White Square Mounting Index, 1 o’clock position)
- EF-M: Lens Mount for EOS-M series Mirrorless cameras. Incompatible with DSLRs or EOS Film SLRs. (White Circle Mounting Index, 11 o’clock position) (2012-2023, discontinued).
- RF: Lens Mount for EOS R series Mirrorless cameras. Incompatible with EOS DSLRs or EOS Film SLRs. (Red Oval Mounting Index, 12 o’clock position)
- RF-S: Lens is optimized for EOS R series APS-C cameras. Can be used on EOS R series Full Frame cameras but the image is cropped to the APS-C image circle. Note this is NOT a separate lens mount.
- L: Canon's professional grade lenses only available in Full Frame lenses NO APS-C lenses.
- DO: Diffractive Optics uses Fresnel lenses
- I, II, III, IV, V: Some lenses have multiple revisions such as the EF 28-80 F/3.5-5.6 V USM (ONLY lens to have a Version V)
- Ring Type USM: AF motor type. Provides fast focusing stands for Ultrasonic Motor. Ring Type USM is the original USM AF motor. Shaped like a ring inside the lens. Allows Full Time Manual Focus either Focus by Wire or mechanical.
- Micro Motor USM: Cheaper and slower AF Motor doesn't allow Full Time Manual Focus. Lens uses gears to adjust focus. EXCEPT for the EF 50mm F/1.4 USM lens (refer to Ring Type USM Mechanical Focus override). (1993-2016, replaced by Nano USM)
- Nano USM: Combines STM and USM technology for fast AF. Allows Full Time Manual Focus is Focus by wire. (2016- Present)
- STM: Stepper Motor for quiet AF. Allows Full Time Manual Focus which is Focus by Wire. (2012- Present)
- AFD: Arc-Form Drive original EOS AF motor. No longer in use was replaced by Micro Motor in 1993 for new lens designs. No Full Time Manual Focus (Retired 1987-1992)
- Micro Motor: Older least advanced AF motor slower AF used in cheaper lenses. No Full Time Manual Focus. (Retired, 1993-2012) Replaced by STM in 2012.
- IS: Image Stabilization available in the lens.
- IBIS: In Body Image Stabilization available in select EOS R Series cameras.
- Macro: A macro lens with 1:1 magnification
- Compact Macro: Lens is able to focus closer than a normal macro lens.
- MP-E: Manual Focus only electronic aperture control no focus to infinity.
- TS-E: Tilt Shift lens with electronic aperture control no Autofocus.
- Soft Focus: Lens is designed to provide a creamy bokeh effect.
- PZ: Power Zoom lens. Only 1 lens released with this feature. Only the EF 35-80mm F/4-5.6 PZ lens used this.
- TTL: Through The Lens Flash metering. Flash system relies on light reflected off the film. NOT compatible with EOS Digital cameras.
- A-TTL: Advanced Through The Lens Flash metering system in EOS film bodies released in 1986. Replaced by E-TTL in 1995. System uses a pre-flash measured by a sensor on the speedlite itself. NOT compatible with EOS Digital cameras. Uses EZ series speedlites
- E-TTL Version 1: Evaluative Through The lens Flash metering system. System uses a pre-flash measured by the camera body to calculate flash exposure. System also relies on AF point selection too. Compatible with EX or EL series speedlites. Replaced by E-TTL II in 2004.
- E-TTL II: Refer to E-TTL Version 1. System was released in 2004 and works similarly to the original E-TTL. But uses focus distance information from the lens. Via a distance encoder in the lens. E-TTL II doesn't rely on AF point selection. Note E-TTL II is IMPLEMENTED in the camera body NOT the speedlite.
- EOS M Series: A discontinued APS-C mirrorless lineup of cameras (2012-2023). Replaced by EOS R Series APS-C cameras in 2023. EF-M lenses CAN NOT BE ADAPTED to EOS R Series cameras.
- EOS R Series: Originally released in 2018 with Full Frame cameras only. Later in 2023 with APS-C cameras. New APS-C lenses were released.
- Z: Lens has an optional attachment to allow power zoom. Only the RF 24-105mm F/2.8L IS USM Z lens has this feature.
Automatic Brightness Adjustment of LED AF Assist Beam: Feature IS NOT SUPPORTED on the R3, R7 & R10 camera bodies.- Multi Function Hot Shoe: Released in 2021 and newer subsequent cameras would feature this. It is backwards compatible with the old 5 pin hot shoe. EXCEPT for the EOS R50.
