Sigma launch mount switching service

SIGMA is going to start a new “Mount Conversion Service” which will enable Sigma to convert the mount of customers’ Sigma Art, Sports and Contemporary lenses from one camera fitting to another.


The ranges convertible include the new Sports models such as the 120-300mm f/2.8

“We believe that a lens is not only such a key device for photographic expression, but also an important resource for photographers”, they say. “It has been our hope to develop the lens system that is genuinely photographer-centered, and you can enjoy it for a longer period of time. As an experienced lens manufacturer that has been creating a diverse range of interchangeable lenses, our desire and know-how is crystalized in this unique service. With this service, the mount of your SIGMA lenses can be converted to another mount system, depending on the specification of camera bodies. This service will be available from September, 2013.”

Editor’s comment – this feature of the new Sigma lens designs was not even mentioned at photokina 2012. They have kept something under wraps which must have been planned from a very early date. The main lens unit of all Sigmas in these series has to be effectively independent of the mount, with electronic protocol conversion chips to handle aperture and focus operation while different rear assemblies change the bayonet.

“Interchangeable lens camera systems appear to be superior in offering photographers more options, allowing them to change lenses freely and have more flexible photographic expression”, states the Sigma release. “Nevertheless, each interchangeable lens is limited with the specification of different camera systems. In other words, you can’t use those lenses if you change it from one type to another. Although lenses are the key devices to create photographic expression, it is a shame that there is no system that purely sets the standard based on the functions and individual qualities of interchangeable lenses.

“In this circumstance, SIGMA is going to start the “Mount Conversion Service” from 2nd September 2013. Our goal is to provide more freedom for photographers so that they can select new camera bodies without worrying about the conventional limitation around the mount system of cameras, and keep on using their current lenses by adjusting them to fit with a new mechanism.”

For the details, please check the Sigma website * This “Mount Conversion Service” is different from a normal repair. In order to apply for the service, please contact your nearest authorized subsidiary / distributor of SIGMA.

HD videocast – NEX adaptors and odd lenses

I’ve finally got round to trying a ‘proper’ videocast – perhaps the first of regular short demonstrations – with the Alpha 55 offering me HD filming while demonstrating the NEX-5. And I can use the NEX-5 to film stuff about the Alpha 55. A Canon 60D helped, though its inability to refocus during filming (which the NEX-5 and Alpha 55 can do) proved a small problem. The sound from the Canon was used, mainly because it had been set with a manual level, while the Sony was using an external condensor mic that pickup up some serious interference from the lights.
The lighting is nothing more than one 30W daylight colour energy saver and one 20W – using an angle desk lamp from IKEA and a spare table lamp. The background is a Calumet (Lastolite in disguise) canvas. To do the filming, I ran a 7 inch Lilliput monitor from the HDMI output of the Alpha 55, and mounted it facing me on a bar right next to the camera. The Canon was set up as a second camera and left running from that position. Editing, including cutting and pasting the soundtrack and parts of the Canon video, was in iMovie 11.

This is a full 1080p HD YouTube film – if you can view it (bandwidth is an issue) try the higher resolutions. The Alpha 55 consistently overheated at around 7 minutes, showing me a temperature warning then shutting off. The room was not warm and the camera screen was both not active, and moved away from the camera back. My first attempt at this film was spoiled by the overheating issue, perhaps because SSS was left on in error. However, on a tripod SSS is not active to any extent when shooting video (it does not have the same problems of creating blur, which happen with still images due to the way mirror or shutter vibration are reflected by the tripod). Previous time limited movies I’ve made have been hand held and of course SSS is both used and expected to be very active.
– David Kilpatrick

Minolta lenses 30 years ago

OUR local dealer, Hector Innes in Kelso, used to be a totally Minolta-dedicated retail shop. Hector and his son Alastair have always been Minolta photographers, and Alastair currently uses the Dynax 7D as weapon of choice for weddings. Their shop is one of those few remaining which combines a professional studio (ABIPP, in Hector’s case) with processing and printing, and retail. On the wall there’s a Minolta clock from two or three changes of logo ago, and on the counter, I found a well-used and yellowed Minolta lens chart mat. Continue reading »