週末、気軽に撮影に行きたいのですが、花撮影などで三脚を持ちたかったので購入しました。クオリティーとしては、価格相応の雰囲気ですが、皆さんが書かれているとおり見た目以上に入れられます。私の場合は、本体として、kissX3+EF-S18-55、交換レンズでEF-S60マクロ、55-200の２本。サイドにＮＧツンドラ１三脚、上のスペースに財布、鍵、ブロア、予備バッテリーです。結構入るでしょう。これ以上の贅沢は価格的にできませんよ。

Acheté pour mon Canon R5 pour monter mon parc objectif EF-S. Fait très bien le travail. Satisfait.

The wide zoom--16-35, 17-35, 17-40, 20-35, et al.--has been a mainstay of pros, especially photo journalists, since the early 1990s. These focal lengths are ideal for sweeping views and shooting in tight quarters, and are easily hand holdable. The 17-40L is my go-to wide zoom for landscape shooting on my 5D MKII and 6D. Important note: if you use a 1.6X cropped frame camera, e.g., Rebel, 60D, 70D, etc., this zoom will have the field of view of a normal zoom, i.e., 28-65mm equivalent.CONSTRUCTION: Canon's EF 17-40 4L USM brings together precision optical design, blazing AF, durable construction and silky smooth zooming. At $750, it's more affordable than the EF 16-35 2.8L USM II, but offers similar build and optical quality. The hybrid metal and polycarbonate construction and quality components make the EF 17-40 4L USM tough as nails, but a lightweight 475 g (16.8 oz). Plus, the moisture and dust seals, including a rubber O-ring on the lens mount, make it a great choice for jungle and beach shooters. Canon recommends use of a clear or UV filter to complete weather sealing (front element moves slightly when zooming).The EF 17-40 4L USM is a classic two-touch design: manual focus ring near the end of the barrel and zoom ring near the mount. Handling is nimble and decisive. Both zoom and focus mechanisms are internal so there is no nested barrels. Plus, internal mechanisms are less prone to sucking in dust than front extension designs. Unlike most AF lenses, the manual focus ring is large, ribbed, rubberized and nearly as smooth turning as the manual lenses of yesteryear. The satin black finish is elegant and the overall appearance similar to the EF 16-35 2.8 USM II and EF 24-105 4L IS USM.The filter size is 77 mm, making filters expensive. This size is common for L series optics, so you can share filters with the EF 70-200 2.8L IS USM and EF 24-105 4L IS USM. The clearance from the edge of the front element to the filter threads is huge and, subsequently, normal thickness filters such as a Hoya Super HMC UV do not vignette on full frame cameras like the 5D MKII or 6D.AUTO FOCUS: This lens sports a ring-type USM (Ultrasonic Motor) that drives an internal lens group and AF really rips. The front element does not rotate nor does the barrel expand or contract during focus and zoom operations. The motor of the EF 17-40 4L USM is silent during AF. It has Full Time Manual (FTM), allowing you to manually focus without switching out of AF mode. If you prefocus manually, the distance window in meters and feet is handy. AF worked flawlessly on my 5D MKII, 6D, 5D, A2, 3 and Elan 7E. That is, AF is fast, accurate and decisive.IMAGE QUALITY: The constant F4 aperture is a big plus for hand meter users and those that prefer manual or aperture priority exposure modes.I found EF 17-40 4L USM sharp and contrasty. There is slight improvement when stopped down to F5.6 or F8, but it is almost as good wide open. The contrast and snap of this lens is apparent even through the viewfinder. After all, there's exotic glass in there, e.g., 1 UD and 2 aspherical elements. The short end, like most wide zooms, shows some barrel distortion. The long end has a small amount of pincushion distortion. For most use, distortion isn't a problem save for architectural photography.Flare is well controlled for a zoom. However, some flare and ghosting may occur with bright sunsets. Use the included lens shade (EW-83E) to protect the lens and help keep flare in check. Incidentally, the included EW-83E is a weak design: too shallow and dish-like, yielding a minimal amount of protection. The EW-83H, a deeper and narrower hood intended for the EF 24-105 4L IS USM, gives better protection and does not vignette at any zoom setting on both full frame and cropped cameras.FINAL BLURB: I bought the 17-40 4L in 2003. Ten years of punishment at beaches, waterfalls, jungles and deserts and it's still going strong, having outlived at least a half dozen of my cameras! If you need the versatility of a wide zoom, this is among the best. The EF 17-40 4L USM has similar build and optical quality as the famous EF 16-35 2.8L USM II, but at nearly half the price, weight but shy a F-stop. For discriminating hikers, travelers, landscape shooters and serious amateurs this zoom deliverers quality without breaking their shoulder or bank and can take the knocks they dish out.

I read a good review on the RF 100-400 IS lens and, having already experienced the high quality of the RF 600, decided to give it a try. My initial impression is that this lens will be producing some fine quality images with it's stabilization and lighter weight compared to my EF 75-300 L, especially when chasing butterflies without a tripod. The RF 100-400 can focus much closer to a subject compared to the RF 600 and is a welcome addition to my collection. Thanks

Works under both Ubuntu 14.10 and mint 17, for those of you that don't use the less common Windows and Apple PC's. But not as yet working on A Samsung EF40F6320

I haven't made a dime in the last 15yrs doing anything other photography and I love this camera. It is very versatile. I have yet to shoot sports action with it yet, but output for all of the portrait work has been great. It handles familiarly like current Canon bodies. Menus , dials and button placement make sense. I have only used EF lenses with a Viltrox EF-RF adapter, but the lenses work flawlessly. (70-200 2.8 L IS, 24-70 2.8 L, 50 mm 1.4, 85 1.8 and a 16-35 2.8 L). Note: I do not shoot much video, so I have no opinion regarding video capabilities, handling or performance.

中古で購入しましたが、同じく開梱展示品として量販店から購入した旧ズームキットのレンズより状態は良好でした。標準ズーム（EF-M18-55mm) は意外と大きく、重さもかなりあるため、携行性を期待し購入しましたがすっかり気に入ってしまい、なかなかズームレンズの出る幕がありません。特にビジネスバッグの片隅に納まるので毎日持ち歩いて、シャッターチャンスを待っています。

Works perfectly, can use all my EF lenses on my EOS-M now