Teleconverters | MUST-HAVE or WASTE of MONEY? Are you better off cropping?

Buy a teleconverter & double your focal length! Sounds amazing, but is that what we should be doing? Lately I have been working with teleconverters even on zoom lenses, something I have always said one shouldn't do! Has the game changed and we can use extenders on all lenses now?
In this video I will share lots of example from Canon & Sony lenses & cameras to figure out if extenders are the way to go or if no extender and cropping is better after all.

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This is the Equipment I recommend:
Canon EOS R5
https://amzn.to/2FV1Fpq
Canon EOS R6
https://amzn.to/3qOtEbQ
Sony Alpha 1
https://amzn.to/2WsXKYZ
Canon RF 100-500 L IS
https://amzn.to/3liEIx0
RF Extender 1.4x
https://amzn.to/3bMD5nO
RF Extender 2x
https://amzn.to/3cuMdwD
Sony FE 200-600
https://amzn.to/3faCMVj
https://amzn.to/2WsXMA5
RF 800 F11
https://amzn.to/3ldq6Pr
RF600 F11
https://amzn.to/3bIBrDJ
Canon EOS 5D Mark IV
https://amzn.to/2ToffWf
Canon 600 L IS III (I have v. II)
https://amzn.to/3dZM7wn
Canon EF 5.6/400 L
https://amzn.to/2AJwbQk
Canon 1.4x TC III
https://amzn.to/2T7vAhz
Canon 2x TC III
https://amzn.to/3fPnYdr
Canon 600 EX - RT
https://amzn.to/3czhDRf
Wimberley Head II
https://amzn.to/3dOuqzI
Gitzo 5543LS (new version of my tripod)
https://amzn.to/3dRfxg3
Gitzo GT2545T Travel Tripod
https://amzn.to/3BSmhXJ
Wimberley Flash Bracket
https://amzn.to/2LweMg5
Wimberley M-6 Extension Post
https://amzn.to/2LxCvfQ
Better Beamer (check for compatibility)
https://amzn.to/2AxbbfF
Flash Battery (Godox & Flashpoint is the same)
https://amzn.to/3fNDWVD
Power Cord
https://amzn.to/3cBJGzt
Y connector
https://amzn.to/2X22zoT
Novoflex STA-SET
https://amzn.to/2y5s1Bt
LensCoat LensHide
https://amzn.to/3bAkoAo
LensCoat Lens Hoodie
https://amzn.to/3fStHiI
Canon 2.8/70-200 II
https://amzn.to/3cArBSB
Canon 4/24-70
https://amzn.to/2AwjeJE
Canon 4/16-35 L IS
https://amzn.to/3fPqPDb
JBL Clip3 Speaker
https://amzn.to/36225D5
Sandisk Extreme Pro CFexpress Card type B 512GB
https://amzn.to/38FPKHg
Sandisk Extreme Pro
https://amzn.to/2WXKt7n
Panasonic Eneloop Pro
https://amzn.to/2X2SQ1q
Minox 8x43
https://amzn.to/2Z7YxxQ
Canon LP-E6N
https://amzn.to/3byTSYg
Manfrotto Mini Ballhead
https://amzn.to/3dR2pYm
FStop Gear Sukha Backpack
https://amzn.to/2Q3e4fZ

TIMESTAMPS
0:00 Intro
1:35 Too Good to be True?
2:04 Biggest Mistake
2:52 Avoid Extenders! (100-400 sample)
3:04 Sony 200-600 + 1.4 Samples
4:46 100-500 Samples
5:43 2x for the win?
6:31 Quick Edit
6:59 Extender or CROP?
8:49 Prime lenses
9:19 RF 800mm better than 100-500 + extenders?
12:49 RF 800mm + 2x Extender! F22 wide open!
14:19 Drawbacks
16:02 When not to use extenders
16:59 Why can we snow use extenders on many lenses?
19:09 Which lenses can take extenders?
20:56 What about in-camera crop modus?
22:11 What's your thoughts on extenders?