I am a professional photographer, but didn't really "need" this lens for my daily work. I was just enjoying photographing birds and this was a "cheap-by-lens-standards" impulse buy.The lens surprised me, and I've been impressed by it. I was worried about f/8 at the long end, but the compression at 400mm still allows for the semi-shallow focus look. It's harder to get a great image when the light is low, and performs best on a sunny day. I've paired it with a Canon R5, so at least the sensor does well at a higher ISO. At first I thought the AF was a little sluggish, but I think it might've been my own user error, had good luck with eye AF settings, able to grab focus on little, erratic birds.The lens is SUPER light, which I love. The lack of weather sealing worries me, I live in Hawaii-it is humid- but I toss it in a dehumidifier box after a misty day. If I continue with bird photography and actually sell images I'd probably invest in the 100-500, but for now, this is a great lens to play with.

I have a pretty significant number of components in my DSLR kit (as listed below) and this bag proved to have adequate space for all the components, with SPACE LEFT FOR MORE!List of components that found a place in this bag:1) Nikon D3300 dslr2) Nikon AF-P 18-55mm Kit lens3) Nikon AF-S 50mm Prime lens4) Nikon AF-P 70-300mm Telephoto lens5) HB-N106 Bayonet Lens hood (for kit lens)6) HB-47 Bayonet Lens hood (for prime lens)7) HB-77 Bayonet Lens hood (for telephoto lens)8) Altura professional dslr cleaning kit (including blower, lens pen, lens brush, lens cleaner bottle and microfiber cloths)9) 1 pc. ND2-ND400 variable ND filter with case10) 1pc. 55mm to 58mm step up filter adapter11) USB OTG Smart card reader12) Mobile OTG cable13) DSLR battery charger14) Nikon WU-1a WiFi adapter for Nikon DSLR15) 1 spare Memory cardAnd trust me when I say this that if organized properly, this bag can still fit a couple of more lenses (I can still fit 1 telephoto lens and 1 prime lens). Refer to my attached photo for evidence.There is provisions to attach my tripod (Snapgear 50inch foldable) at the exterior side of the bag, but I would not use that since it wkuld make it extremely difficult to swing the bag from my back to front (using the sling function) when I need quick access to my camera.Pros:a) This bag is smaller than it looksb) has more space than I need to fit all of abovec) Is extremely well padded from all sidesd) Dividers are of good quality and completely customizable (i.e. we can fix them at any position inside the bag as per our requirement).Still, I took a star away for the following reasons.Cons:a) not water-proofb) No water-proof cover provided eitherc) Chains are of acceptable (but not excellent) quality...felt like needs to be handled with care.

Superb fast lens, highly recommend, slower AF than kit lens but still a superb

I use this extender with my 70-200/2.8, 300, 400, and 500mm tele lenses for wildlife shooting (hobby). My cameras: 7D, now upgraded to a 7D II, and a 5D III. Important in particular for 2x TC users: both latter cameras still provide an active center field autofocus with lens+TC combos that have an F/8 initial aperture. In particular every birder knows: you can't get enough focal length. And if you don't want to invest in - and carry - a super huge & heavy 800mm lens, you have to have TC's in your backpack. I use Canon's very good 1.4x MK III TC frequently, and less frequently this 2x TC. Many reviewer's here explained already the 2x TC's technical pros and cons in detail. In real life, according to my experience, you can break it down to those three items that really count:(1) images lose visibly sharpness and get softer, in particular in the edges (full frame) but with re-sharpening during post-processing (or sharper pre-settings in your camera) you can get acceptably good results (= you still can see feather/fur textures) IF...(2)... there is enough light available (!!) for a - with many lenses - quite slow combo AND...(3)... the object does not move too fast and unpredictable, because AF will work as sluggish as an old digital compact camera (but accurate with a carefully micro adjusted camera).This may also be important for you:- Oh no, you can't combine Canon's Mark III 1.4x with 2x TC's to shoot man's first footsteps on Moon from Earth. Canon prevented this mechanically, not only by some sort of pins (you could easily remove): the whole TC's do fit because their lens systems extend from their bodies and would collide before their bayonets snap together. Don't complain, be sure that the image quality of such combos would be too lousy anyway for modern high res sensors. If you need extreme focal lengths check if digiscoping (mostly without AF) would be the better solution for you.- Some lenses do not fit with Canon's Mark III TC's because, again, their extended lens systems would literally collide with the back lenses too close to the bayonet. The example in Canon's lens line that I presume is most prone to such a disappointment is the macro lens EF 100mm/2.8 L IS USM. So check the TC's compatibility with the lenses you want to use it with before you hit the order button. Btw you can pimp your macro's magnification by using extension tubes, plenty of good ones with full electronic supply of AF and aperture are available.Final word(s):Given the fact that a 2x TC is always a quite extreme optical compromise, the Canon engineers did a decent job with the Mk III version. But do not expect any wonders. An EF 400/5.6 lens will always be much sharper at 400mm - and focus much quicker - than a 70-200/2.8 II + 2x TC III combo, I can tell from my own experience.Those who just start with the TC business, I'd highly recommend to go first for Canon's 1.4x TC Mk III. It provides less reach but much better optical and AF performance. In practice you can use it much more frequently and get good results.

Part 1 - Minolta MD to Sony NEX adapterTechnically, it slightly overshoots infinity but the issue is easily corrected by dialing back the focus ring just a tad --- Not exact but clearly better than not-at-all.Although very light due to extensive aluminum usage, the build quality and fit-and-finish of the adapter is superb. Connections on the lens and camera mount sides are tight and precise --- absolutely, zero slop. The top of the lens release button is flattened making the lens removal process very easy and comfortable.Other notes:- There are no electrical connections so focus and zoom must be done manually on the lens itself- When mounting the lens, turn the adapter clockwise till you hear a "click"- Tested with a Minolta 85mm f/1.7 Rokkor-X MD lens mounted to a Sony a6000 camera-----------------------Part 2 - Nikon Ai to Sony NEX adapterEdit: Based on my positive experience with the Minolta MD adapter, I also purchased the Nikon Ai adapter later.As with the Minolta MD adapter, the Nikon Ai version focuses beyond infinity a tiny bit. Fortunately, the same solution applies - dial back the focus ring and the horizon will become crystal clear. The build quality is impeccable and the finish is smooth and clean of burrs or machine marks. Connections on both sides are taut and precise with zero play.Additional notes for Nikon Ai adapter:- No electrical connections present so focus and zoom must be done manually on the lens.- Unlike the Minolta MD adapter, mounting the lens for Nikon adapter requires a counter-clockwise turn until you hear the "click" of the locking mechanism- Tested with a Nikon Micro Nikkor 55m f/2.8 Ai-S MF lens mounted to a Sony a6000 camera

I'm not going to post images because every lens can take a sharp image (nearly). The IS and AF are awesome though and that's a great reason to pick this up. Way better performance than the RF 50mm 1.8

It's an adapter - it allows me to put my EF glass on my EOS-M and they are fully functional when mounted. AF, Metering, aperture control - all good. Made of metal and I appreciate the tripod mount on it - handles my 70-200 f2.8 IS II without a problem although it looks pretty much like a rear lens cap when setup that way :)

I had this lens for almost 2 years now, and I can say with confidence that this is a great lens. I post some pictures with this review and I am happy with the results. The only reason why I gave the product a 4 star is because of the random screen and the AF. The little screen on the lens is something that you'll probably never really use. There hasn't been a situation where I looked at it and thought "this is a wonderful feature". Therefore I always have it turned off. Also one of the things I notice is that, this lens could feel as if the AF is a little slow. I understand that the product is not a pro-grade product but I thought I should write it down as I believe it is important. But other than that, it was worth my money and it was great why to start my hobby as a photographer.