Review of Sony 21mm Ultra-wide Conversion Lens for Fe 28mm F/2 Lens
Alongside the new FE 28mm f/2, Sony released two conversion lenses that attach to the 28mm and turn the combination into a 21mm ultra-wide lens and a 16mm fisheye lens. Today, I'm reviewing the 21mm ultra-broad conversion lens, otherwise known as the SEL075UWC. The 21mm conversion lens attaches to the front of the FE 28mm and creates a 21mm f/2.8 lens combination with full autofocus and autoaperture. EXIF data is passed along likewise, so the in-trunk image stabilization of the A7 Ii and new A7R 2 will automatically work at the correct focal length. The 21mm conversion lens retails for $249, so it's an inexpensive way to gain an autofocus ultra-broad for your full-frame East-Mountain camera. Sometimes these add-on lenses are more hype than real imaging solution, and so I was very interested to come across which of these things is true of the 21mm lens. 1 thing before we start: If you lot haven't seen my review of the FE 28mm f/2, make sure you check that out equally well.
Construction and Treatment
Ok, to get one thing out of the way, writing "21mm Ultra-Wide Conversion Lens" is something that I don't feel the need to do throughout this article. Besides, I've never been fond of referring to Sony lenses by their stock number. So, at many points throughout the review, I'll refer to the 28mm f/2 + 21mm UWA conversion lens every bit the "Iron 21mm f/2.viii." There are 2 reasons for this. Offset, it's a lot easier. 2nd, it's the nomenclature that Sony uses in the EXIF information when the conversion lens is mounted. If information technology's good enough for Sony, information technology's skilful enough for this review.
The conversion lens is a simply plastic and glass lens with no moving parts and no electronics. The lens attaches to the Iron 28mm f/2 via the hood bayonet mount, and it locks deeply into place. A magnet sensor in the conversion lens tells the FE 28mm that it is mounted, and all camera information then views the lens as the Iron 21mm f/2.viii. The conversion lens is simple and sturdily built, but the connection feels a bit too flimsy to me. This doesn't mean it wobbles excessively or anything, merely rather I don't know how much I would trust the lens to a solid knock well-nigh the front, and I don't know how well that slim connector will agree upwardly to repeated employ. I would have preferred the bayonet on both pieces to be metallic and a scrap larger and more robust.
The Fe 21mm f/2.eight combo turns the compact FE 28mm f/2 into a rather long and moderately heavy lens. I found the lens to handle well when shooting, though the procedure of detaching the UWA converter from the 28mm and putting it away, especially with the more hard to attach rear cap, was less convenient than switching between two dedicated lenses, though the space saved in the bag vs. two different lenses is a nice bonus.
The Iron 21mm has a unique lens cap that fits inside the fixed lens hood to seal the whole front of the lens. The cap is well designed and clicks deeply in place. The reason for the oddly designed cap, is that the Fe 21mm lacks any filter threads, so using a polarizer or neutral density filter is impossible without rigging up some ad-hoc square filter holder.
Autofocus
The FE 21mm f/2.8 focuses effectively equally fast every bit the bare Atomic number 26 28mm f/2 lens, which was a prissy surprise. Despite the i terminate slower aperture, at that place was no apparent deviation to me in how the lens focused, both in speed and in accuracy. As the Iron 28mm tin can struggle somewhat in dimmer light or backlit scenarios, and then too can the combination with the UWA converter.
Continue: Image Quality
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Source: https://admiringlight.com/blog/review-sony-21mm-ultra-wide-conversion-lens-sel075uwc/
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