Posts Tagged ‘cameras’

Sony Alpha

Friday, April 30th, 2010

Some may be surprised, but the history of the Sony Alpha begins under another name: Konica-Minolta. Konica-Minolta is a name embedded in the history of photography that precedes even today’s giants like Hasselblad, Nikon or Canon. Indeed, it is worth remembering that Konica started its photography business in 1873 (predating even Kodak), while Minolta followed suit in 1928.

Over the years, Minolta (after its merger with Konica dubbed Konica-Minolta) has produced many legendary names such as the DiMage series, the Dynax series or the Maxxum. Although the Alpha system bears the Sony name, its origin lays within a project of the Konica-Minolta laboratories dating 2005. After Sony acquired the photography division of Konica-Minolta, the Alpha project was pushed up resulting in the 2006 launch of the Sony Alpha 100.

The Sony Alpha 100 was a pretty advanced piece of technology at its time and although it’s been discontinued, it still holds its ground today.

The features of the Sony Alpha systems are not to be disregarded. It was the second system to use an image stabilization system based in the body (in truth, it should’ve been the first but Pentax released theirs earlier), allowing the use of image stabilization with any lens. Secondly, it used a technology called Eye-Start, which allows the camera to start focusing when it senses the photographer’s eye close to the viewfinder, saving time. Also innovative was the camera’s ability to clean the sensor by shaking it before being turned off.

Probably the best advantage of the Sony Alpha, however, is its support for legacy Minolta and Konica-Minolta lenses. Thus, a photographer can save money by buying old real glass lenses at a cheap price.

The system is not without downsides though, as it tends to overprocess images. The Sony Alpha’s performance at high ISO sensibility settings is also extremely poor, resulting in noisy unclear images. Although the latter is improved in more recent models, with Sony Alpha 100 one couldn’t correct this even when shooting RAW images.

The Sony Alpha system is definitely a contender on the market today, giving the elders (Pentax, Canon, Nikon) a run for their money. If Sony would consider lowering its prices we would definitely witness a turn in the digital camera market.

Sigma 18-50mm f/2.8-4 DC OS HSM lens

Monday, March 22nd, 2010

Sigma is a reputable lens manufacturer that covers most of today’s popular camera brands: Nikon, Pentax, Canon, Sony as well as its own brand Sigma. Throughout time, Sigma built itself the reputation of offering low prices for average quality products that rarely rise to the level of better manufacturers.

However, keeping an eye out for little camera lens gems that come at low prices is always a good idea since you never know when luck strikes. We, at bestcamerareviews.org, have found such a gem in the c for the Canon EOS mount.

This little Sigma lens packs quite some physical features, offering wide-angle performance at 18mm with the luminous f2.8 value. It accepts 67mm filters, it focuses at the minimum distance of 30cm and offers a fair magnification value of 1:4, which is quite acceptable since it’s definitely not a macro lens. This Sigma camera lens offers Optical Stabilization (OS – which can be turned on or off via a small switch on the lens). As such it has a number of extra mobile elements, bringing the total to 16 elements in 12 groups. In addition to this, the HyperSonic Motor (HSM) makes focusing extremely fast and incredibly silent. The optical system of this camera lens is also endowed with SPecial Low Dispersion (SLD) and Extraodinary Low Dispersion (ELD) glass elements which help reduce optical abberations, resulting in sharp and detailed images. All these features do come with a price however since the lens, although fairly compact, is rather heavy, weighing in 400 grams.

Working with the lens is quite a pleasure (test images will come soon) and the quality of the images is unbelievable given the price of the lens. The Sigma 18-50mm f/2.8-4 DC OS HSM lens for Canon’s EOS system is perfect for portraits and landscapes, offering great quality and colors. Most of the time the focus is amazingly accurate, though we noticed that after heavy use the lens eventually will refuse to focus and it will take a camera restart to convince it to focus again. In addition, low light focus works perfectly but the lens is easily fooled by white surfaces regardless of lighting conditions. A minor inconvenience may be noted in the fact that the f2.8 can only be attained up to 20mm focal distance, beyond that it steadily increases towards 4 (through camera settings it can go all the way to f11).

Overall, we can say that the Sigma 18-50mm f/2.8-4 DC OS HSM lens for Canon EOS is a real bang for the buck, its performance being well beyond its pricing (around $200 at most online camera stores).