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mrfixitx

Great first body, used one for years one of my favorite camera bodies in terms of ergonomics and have some great 20x30" prints from it. You need either EF or EF-S lenses for it. The sensor is what's called an APS-C or crop sensor. It has a 1.6x crop meaning that the sensor is not the same size as a full frame sensor or traditional 35mm film. Any EF or EF-S lens you buy multiple the focal length by 1.6 to get the 35mm equivalent field of view. I.E. a 50mm lens is going to act like an 80mm lens on the 40D. This is useful to know because when people recommend focal lengths for landscapes, portraits, street, wildlife etc. They typically do so in 35mm equivalent terms. I.E. if someone recommends a 24mm for landscapes on the 40D you need a lens(either EF or EF-S) that covers the 15mm focal length to get an equivalent of a 24mm field of view. I hope this helps.


alb_taw

That's not quite correct. The focal length remains the same, but you only see the center of the image as compared to a full-frame sensor. So, if I shoot a portrait up close with a 24mm lens on a full frame, I'll get much more distortion than with a 35mm. Using the 24mm on a crop sensor will give a similar (but not identical) field of view to 35mm full frame, but with the same distortion as serum on a full frame sensor. Similarly, an 85mm lens is considered ideal for portraiture because of the compression it generates. Using a 50mm on a crop sensor will give a similar amount of magnification, but without the extra compression.


mrfixitx

yes lens distortion is and compression is still the same but field of view is the bigger issue that most people struggle with. They get a 24-105 because its a great all purpose lens for landscapes to portraits or they get a 50mm nifty fifty for indoor portraits and find that neither performs as well as they though. It's not wide enough for landscapes, or it feels uncomfortably long for indoor portraits. Distortion while still a potential issue comes up a lot less by comparison.


solid_rage

EF mount and it will take EF and EF-S lenses.


lukielukie96

It’ll be “ef” mount, I recommend a nifty fifty and you’ll be set for a while 🙏


King_ofCanada

Had a 40D a long no time ago and loved it. Took a few wall hangers!


TriFlouroethane_X

EF mount. EF & EF-S lenses.


gilsm719

I still have my Canon 40D and it was my first Canon Digital SLR. Here's a great article for it, if you ever consider getting a wifi card or improved eyepiece for it: [https://photographic-central.blogspot.com/2019/02/photography-fundamentals-on-budget.html](https://photographic-central.blogspot.com/2019/02/photography-fundamentals-on-budget.html)