The difference between DSLR and Mirrorless, Help please

[Cas85]

Hi there I am fairly new to learning more about photography, however I have been taking photos for over 20 years. I have a canon eos rebel T5 and recently bought a canon FD NFD 800 mm f 5.6 L Ultra. Which I am defeated to find does not fit my camera. I asked a local photographer what camera I would need. She said a Canon Full Frame. However she’s a Nikon girly and can’t give more info….Can anyone please help guide me on which camera to buy that will heighten my photography of nature in Alaska please.  Also can someone explain the difference between DSLR and mirror less ? Just needing a nice camera to fit lens I paid way too much for. Thanks! 

[johnrmoyer]

There exist mount adapters for Canon FD to Canon R. I do not know whether that FD lens would be better than the RF 800mm F11 STM. The RF lens would have the advantage of auto-focus. https://urth.co/products/canon-fd-lens-mount-to-canon-rf-camera-mount

The RF200-800mm would be twice the price, but I expect would be much better.

[shadowsports]

The 800mm in this thread is limited for many reasons. Not because of its mount, but also because of focal length.  This FL is basically a telescope for your camera.  Its not a great candidate for Alaska unless you are planning to set up somewhere and wait.  You'll miss a lot of beautiful scenery.  You can get a shot of a distant eagle, bear or glacier, but little else.  Its not practical for walking around either.  We were in Alaska last August.  To really see Alaska, there is a lot of walking and hiking involved.