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Viewfinder specs and view

The SD1's viewfinder is large by APS-C standards - its 0.95x magnification places it on a par with the likes of the Canon EOS 7D, Nikon D7000 and Pentax K-5. However this is noticeably smaller than the large electronic finder on Sony's SLT-A77, which is close in size to the optical finders of full-frame SLRs. It offers 98% coverage of the captured scene both vertically and horizontally, while its main competitors all claim 100% coverage.

The SD1's fixed matte screen gives a good indication of focus, making manual focus relatively straightforward. A corollary of this, though, is that the view can get somewhat dark when using lenses with small maximum apertures in the F4-5.6 range. It's also worth noting that focusing in the OVF can never be quite as accurate for really critical work as magnified live view, which the SD1 regrettably doesn't offer.

Viewfinder size

One figure hidden away in every SLR's spec is the size of the viewfinder (often in a format that makes comparison between competing models impossible). The size of the viewfinder is a key factor in the usability of an SLR - the bigger it is, the easier it is to frame and focus your shots, and the more enjoyable and involving process it is.

Because of the way viewfinders are measured (using a fixed lens, rather than a lens of equivalent magnification), you also need to take the sensor size into account, so the numbers in the diagram below are the manufacturer's specified magnifications divided by the respective 'crop factors'.

The Sigma SD1 has a viewfinder magnification of 0.95x, placing it in line with other high-end APS-C cameras such as the Nikon D7000 and Pentax K-5.

Viewfinder crop

Many SLRs crop the frame slightly when you look through the viewfinder - in other words you get slightly more in the final picture than you see through the viewfinder. The SD1 shows 98% (vertically and horizontally) of the frame. This may seem like a disadvantage compared to other high-end APS-C cameras which offer full 100% coverage. Unless you spend all of your time working extremely critically with the camera on a tripod, however, it's pretty well irrelevant in practice, as the example below illustrates.

The white frame overlaid on the image simulates the 98% coverage you have of the captured scene when looking through the SD1's viewfinder.

Viewfinder information

The SD1's viewfinder display includes exposure mode and metering pattern, alongside shutter speed, aperture, exposure compensation and available buffer depth. But full-time display of ISO is conspicuous by its absence - you can only see it by pressing the awkwardly-placed ISO button. Instead the SD1 displays the much-less-useful number of shots remaining on the card, which in these days of multi-GB storage tends to say little other than 'lots'.

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Total comments: 3

I purchased an SD1 for my business of photographing textiles in a studio situation and I feel totally deflated. The actual image quality is excellent, but the tethering capabilities are pathetic. I expected to be able to click from my PC to launch a shot, then instantly see what I had taken, before moving on to the next item, which sadly is not the case. Their software application known as Sigma Capture Pro should be reported to the trading standards council, as there is nothing 'Pro' about it as it is just a glorified remote shutter release program. Furthermore in order to have access to your images on a PC, you need to go into the menu function on the camera and disable the 'remote capture program' then select mass storage to view your images. Going through this process with every shot, may be good for you cardiovascular system, but for someone who relies on seamless throughput to make a living, this camera is junk.


I was looking at the photo comparison today, comparing the SD1 against the new Canon 5 D Mk III, the Nikon D800E, and the Pentax 645 D . . . at ISO 800 . . . and I just can not believe my eyes. Take a look at this:

The SD1 never ceases to amaze me.

Scott Greiff

Why won't the comparisons load?

Total comments: 3