Photoclub Alpha

TOKINA lenses – the brand name for optical giant Hoya’s interchangeable range – have always been renowned for their tank-like build quality and resistance to plastic trends. They compare so well with Nikon’s own lenses it is hard to tell the difference by feel, and the current design also matches Nikon more than it does Canon.

The latest news is that Tokina is to introduce the 11-16mm ƒ2.8 in Sony Alpha mount. Tokina stopped making Minolta mount lenses shortly before their parent company Hoya acquired Pentax. The Tokina factory has been producing

The Alpha System celebrates its Silver Jubilee or 25th Anniversary this month – though left uncelebrated by the inheritors of the Minolta AF legacy, Sony. They have no reason to draw fresh attention to the age of the system, as in four years they have taken it the same sort of distance that Minolta took the world’s first AF system in the late 1980s.

It’s not only Alpha’s 25th birthday. This is also the 25th birthday of modern AF SLR systems – all of them!

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For Photoclubalpha and the historic Minolta Club of Great Britain, the anniversary does matter. A good many of you out there have been members since the launch of the system, often using the earlier SR and X manual focus systems before that. We still have a 1985 Minolta 7000AF and it’s still working just as it did when new.

25 years before the first Minolta SLRs appeared – a folding Minolta Six of 1935

I don’t mind showing my age to make a comparison. I was 11 in 1963 when I took my first pictures with an SLR camera. My father had bought himself a Pentax S3 – and the camera it replaced was 25 years old, a pre-war Zeiss Ikon Kolibri collapsible 16-on-127 model.

When the Kolibri was made, 127 was the ‘vest pocket’ format of choice. 35mm was on the rise, but 35mm SLRs had not yet arrived. They were as much a thing of the future as digital SLRs were when the Minolta 7000AF was launched.

But within that 25 years, there was hardly a single camera system made with interchangeable lenses that did not become obsolete. Only the ‘frozen assets’ of the cold war kept some systems, like the Exakta bayonet and the Praktina, alive. New brands were launched, from the British Wrayflex and Periflex to the Italian Rectaflex and many German oddities. It was not unusual for an entire system to be come and gone within a few years.

Even in the following quarter-century, the high years of the Japanese 35mm SLR, the succession of lens mount changes was bewildering. Independent lens makers like Tamron and Sigma were forced to make systems using interchangeable mounts not just because the public wanted it. A dozen or more mounts were made for every lens and in the 42mm screw thread fit alone there were endless variants – Praktica LLC (Pentacon Electric), Olympus FTL, Pentax ES and more.

It was more or less a 25-year cycle – the SR system was announced in 1958, and really got underway by 1960. It was to be another quarter century before the AF system arrived. We are now a further 25 years on – can we expect a totally new camera system, once again, in 2010?

Minolta’s SR bayonet mount, introduced in 1958/9, actually remained basically unchanged all the way through to 2005 when the last manual focus model, the X-370S, was available. It survives even now as a mount popular in China where the Seagull range from Shanghai Optical includes Minolta fit models. That mount only ever had one major revision, to add a linkage for open aperture TTL metering. The introduction of programmed exposure and shutter priority was cleverly enabled by using the existing design of lens mechanism and improving its accuracy, while adding a simple reference lug to the ƒ-stop setting ring.

Nikon’s 1959 F-mount proved similarly easy to improve without any basic modification. Both these bayonet mounts celebrated half a century of production in 2008/9 – another landmark, which Nikon was able to celebrate but Minolta of course could not.

Tokyo, Japan, November 10, 2009 — Ricoh Co., Ltd. (president and CEO: Shiro Kondo) today announced the development and release of the GXR interchangeable unit camera system featuring the world’s smallest and lightest* digital camera with the ability to change lenses.

The new GXR is an interchangeable unit camera system in which lenses are changed by using a slide-in mount system to attach camera units to the body. The lens, image sensor, and image processing engine are integrated into the camera units so the body itself does not contain an image sensor.

With world-leading small size and low weight* enabling easy carrying, the GXR interchangeable unit camera system features a highly rigid magnesium alloy body and multiple camera units that can be changed to best fit the scene to be photographed. You can enjoy easy lens changes as well as amazing image quality and shooting flexibility. Concealing infinite possibilities in its small body, the GXR is a revolutionary camera system that pioneers a new realm of photography.

Distinctive characteristics:
1.    Lens, image sensor, and image processing engine comprise an integrated unit which can be changed to match the scene being photographed.
2.    World’s smallest and lightest* digital camera with interchangeable lenses
3.    System potential expanded through use of interchangeable units

Comment from David Kilpatrick:

Though the Ricoh system as revealed through this press release appears to show only a GR-size body with a zoom lens module suitable for a 2/3rds or slightly smaller imaging sensor, Ricoh has said that sensors right up to the size of APS-C will be built in to further lens modules. The ultra-wide angle version would have an APS-C sensor making similar to the Sigma DP-1. For similar reasons, high ISO and fast lens may be combined with a different size of sensor.

This is not the first time a digital camera has been designed with lens-sensor modules that could be changed. The Minolta Dimage EX 1500 accepted either a standard zoom module, or a wide-angle module. These included viewfinders (missing from the Ricoh concept, which relies entirely on the rear screen or electronic viewfinders) and had the unique ability to be removed from the camera on a 1.5m long Cable EX. This allowed users to position the wide-angle module inside scale models, doll’s houses and similar subjects to obtain realistic human-scale perspectives. It was only a 1.5 megapixel camera, and Minolta abandoned the concept before they had a chance to develop it further, whatever dPreview said ten years ago:

http://www.dpreview.com/reviews/minolta1500/

The technology behind the Ricoh is not all that different from the way consumer digital cameras are constructed anyway. Lenses are already sold sealed to CCD/CMOS sensors, as a single unit. That is how the OEM sources of the lens-sensor modules market them. At photokina, you can see (every two years) a new crop of such modules with both the technical resolution specs of the optical unit and the megapixel count of the sensor, identifiable to this non-Chinese/Japanese reader in the middle of a description which is usually inb Chinese. In 2006, I tracked such a module from its maker to the first camera I could find which used it – a compact branded as Vivitar. The customisation consisted of building any body the maker chose to design, and putting a ring on the lens front labelling it is a high resolution Vivitar lens; actually, it was just a generic lens-sensor assembly from China.

Ricoh has also pioneered unusual digital designs in the past, including rotatable or detachable lens modules and one of the first viewfinder-less designs, where the viewing screen was intended to be used at waist-level rather than today’s habit of waving the camera in front of your face.

This differs from anything previously done in the power of the CPU unit in each lens module, and the control unit with display and card module in the host body. It should allow any reasonable pixel count and sensor size to be built in to future optical modules. If the accessories do eventually include dedicated APS-C lens-sensor sealed modules, ‘dust on sensor’ will be one clear benefit (or the lack of it will). A supertelephoto module is also planned which will use a sensor smaller than APS-C.

SONY puts two 10.2 megapixel consumer digicams on the market in September 2009 using the back-illuminated Exmor R sensor. This CMOS sensor architecture takes the ’sandwich’ which forms the light-sensitive pixel wells, and reverses it so that the side previously used for connections now faces the image-forming light. This change allows more light to be captured, resulting in improved high ISO performance. So far, the Exmor R technology has only been used in video cameras and this is the first appearance of it in still cameras. The cameras can shoot at 10 frames per second.

Tamron’s new ultra wide angle zoom for APS-C/DX is getting a bit of a blasting from reviewers. Now, when I see this happen, I get curious. Lens testing is often badly designed for such zooms, involving test chart targets at distances which are extremely close and result in very bad figures caused mainly by a strong curvature of field (dished, ‘cap’ shape relative to the camera) when gets worse in effect the closer you focus.

SONY’s stand was a real brightener for Focus. Gone were the black and orange colours I criticised at photokina, which for two successive years created a black hole compared to Canon’s oasis of light. Instead, huge white silks extended to the roof with bright spots and floods creating an inviting zone of pure light. White and orange rules!

SONY has a stand at Focus on Imaging in the UK after an absence of three years for the Alpha brand from this major annual photo fair, said to the be largest national show in Europe with the exception of photokina. On Stand L28 – right next to the Canon exhibit – the UK’s technical sales executive Paul Genge has lined up a nonstop programme of speakers and demonstrations.

OUR final production Alpha 900 body arrived on Saturday September 20th, and went along to photokina 2008 on Monday 22nd where it was used in a routine way – without flash – to take whatever pictures were needed for magazine reports. Sometimes it can be better just to use a camera on whatever difficult or poor subjects the world throws at you, than to devise impressive test situations.

By Shirley Kilpatrick – transcribed from recording made during the conference in Edinburgh.
(This is a close transcript of speeches delivered by Sony execs, with photos).

Sony has released – without announcement – a new firmware version for the Alpha 700 which includes an OFF function for high ISO. This is presumed to be in advance of tomorrow’s press conference, where the Alpha 900 will be revealed. Journalists could be expected to ask questions about the NR, and the lack of firmware upgrades to the Alpha 700, and they have acted just in time for this launch and photokina to remedy the situation. Article with image samples and download links:

We have received the first press release today (Sept 8th) for Sony’s presence at photokina 2008. It doesn’t mention the still DSLR range except in referring to digital photography in general. Here is the text.

TAMRON has announced that its new 10-24mm lens will be an ƒ3.5-4.5 design – not an ƒ2.8 as some rumours had it – and will hit the shops in Nikon and Canon mounts first, on September 20th.

At the end of September 2006, I set off for a quick visit to photokina in Cologne, having parted company with Icon’s am-pro magazine ƒ2 and not really needing to report on the whole show in detail. Here’s the report I wrote then, with photos, and some thoughts for the 2008 show.

There seems to be a lot of speculation about the Alpha 900 or Pro, and uncertainty about the timing of introduction. The August 14th date is not the 900, it’s two Cybershot models. The Alpha 900 will, as far as we are aware, be shown to the press on September 9th/10th worldwide.

SONY UK has notified us of a press conference to announce an ‘exciting digital camera’ on August 14th.

They have also said that full details will be provided soon. It is possible this will be embargoed – we may attend a meeting on the 14th, but have to agree not to publish until a date later on, perhaps in September.

Update: it seems there is an international Sony Alpha press trip on Sept 9/10th to Edinburgh. Members of the Euro technical press have been invited, as a two-dayer with a stack of nightlife (the Festival and Fringe have just kicked into action today) it is an ideal location for putting the Alpha 900 and new 16-35mm and 70-400mm into the hands of journos. But it’s one week after the Sept 2nd close of the Festival itself, with the fireworks display. The Fringe is still running.

It seems very unlikely that the Aug 14th conference would be the long-awaited Alpha 900 launch since it is only a single day, or part of a day, and would not take place so long before an apparent pre-photokina pan-European press event. Judging by previous launches – Alpha 100, 2-day event in Morocco June 5-7th 2006; Alpha 700 2-day event on Lake Como Italy end of 1st week in September 2007; my guess is that the Edinburgh event is the big hands-on opportunity for the flagship full frame DSLR almost one year to the day after the launch of the 700. A very busy year, too, during which Sony has launched three other DSLR bodies and several important lenses.

Well, Edinburgh’s 45 minutes from my door and even if I am surplus to the tightly controlled A-list of such events I may be able to drop in and join them for a drink, as there’s one or two folk going I would like to say hello to. But then, Edinburgh is an airport! Just because the press gets to land there does not mean the city is where they are headed. I’ve been to big press events at Gleneagles (Kodak) and even in the middle of the Berwickshire countryside (Canon) in the past. It could be anywhere in Scotland – and some places in Scotland are not on our doorstep!

It costs me over one working day and around £200 to get to a London event (I’d rather by invited to almost anywhere in Europe than London in summer…) but whatever goes, the September date is an essential launch I am sure, and not just another Cybershot across the bows of the enemy!

- DK