Manual Focus Lenses on a Canon 60D – A Zuiko 28mm f2

Manual Focus Lenses on a Canon 60D – A Zuiko 28mm f2

This is the second of a detailed series of posts for photographers who are thinking of using relatively cheap old manual focus lenses on an APS-C DSLR. This time it’s the Zuiko 28mm f2, my favourite lens on 35mm SLRs (hence the name of this blog), which sometimes graces the Canon 60D when it’s very lucky as a fast standard lens.

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What it’s capable of in bright conditions at f8 – sharp, superb colour and saturation. This was take on an Olympus 620.

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Same boat from the front – so sharp it hurts!

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On a very dull day – depth of field at f2 at close focus distance. Not much room for error but easy to focus!

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Close up at f2 – the mill (see below) is in the background. The rendition of out of focus areas is very pleasing – the bright edge on the out of focus verticals (just behind the snowdrops) disappears at smaller apertures. The Sweet 35 Lensbaby does the same thing.

It’s effective focal length on a crop frame is around 45mm, the aperture range is f2 to f16 and its minimum focus distance is just less than 30cm. To improve close distance photography it uses ‘floating lens elements’ which move to compensate for near distance abberations- unusual in a lens of this age. Filter size is a standard 49mm.

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In use – nicely balanced – like the previously reviewed 17mm Vivitar lens, it’s all metal and quite heavy. The focus throw is short and smooth. All in all – lovely!

On to some proper tests – all test shots on an 18MP Canon 60D at ISO 200 and Olympus OM mount lenses using a Fotodiox adaptor. Images were taken in centre weighted metering mode, saved in RAW and converted to JPG with default settings in Canon’s DPP software. The only tweak was to the white balance – the 60D was in auto WB mode and the shots had a very blue cast – corrected in DPP.

So – the test and it’s back to the Mill which has become a test standard :-

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A dull day with not much light, so something of a challenge in the contrast department. Given the conditions, nice contrast, colour and sharpness.

Starting at f2 – wide open and more of the ‘sheen’ seen in the 17mm lens test caused by light bouncing around the mirror box. Not bad but there’s a bit of soft purple chromatic aberration in the centre shot. These are huge enlargements from the frame though and these faults wouldn’t be seen on a 10×8 inch print – or larger probably. Nit picking!

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f4 – The ‘sheen’ has gone – edge slightly softer (strange) and centre as sharp as it’s going to get.f4

f8 – out resolving the sensor I’d say …f8

f16 – some softening in the centre again but the edge is fine.

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Chromatic aberration – other than some soft purple and blue CA at f2, there isn’t much at all, maybe a few pixels at most.

All in all, this is a bit of a special lens, and I’m very lucky to have one having bought it for my OM system 20 years ago. To be honest, buying one second-hand is quite expensive and doesn’t make that much sense, when Canon make an AF 50mm 1.4 for around the same price – I’ve seen mint condition ones go for £300. If you come across one for less or get the chance to ‘inherit’ one from someone – snap it up!

In summary then – at f2 it’s two stops faster than a standard zoom and pretty good. At f5.6 to f8 the resolution is as good as it gets.

There are f2.8 and f3.5 versions which are much cheaper but I’m afraid I haven’t ever used them – but I know where I can borrow one!

To see how this – and virtually every other known Zuiko lens known to man – performs on four thirds and micro four thirds sensors have a look here – an excellent series of tests at biofos.com!

Thanks for looking – hope you find this useful.

If you’re interested in using other MF lenses on your DSLR have a look at the other reviews on the film, camera and lens review index tab.

Manual Focus Lenses on a Canon 60D – A Vivitar 17mm f3.5

This is the first of a detailed series of posts for photographers who are thinking of using relatively cheap old manual focus lenses on an APS-C DSLR. In order to do a meaningful evaluation we’ll need some proper test shots – so other than a few examples on 35mm film and a rather nice Dorset mill as a subject there aren’t any photographic masterpieces I’m afraid.

All test shots on an 18MP Canon 60D at ISO 100 and Olympus OM mount lenses using a Fotodiox adaptor. Images were taken in centre weighted metering mode, saved in RAW and converted to JPG with default settings in Canon’s DPP software.

So starting the lens series at the wide end – a 1980’s era Vivitar 17mm f3.5 and quite a special focal length on a 35mm Olympus film camera. Ultrawide on 35mm (I think the angle of view is 92 degrees) it’s capable of some typically dramatic distortion :-

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Image from the Vivitar on an OM1N

This lens is identical to a Tokina branded lens of the same era, and the edge performance and chromatic aberration always left something to be desired – at least that was the rumour. These lenses were always mid range and weren’t expected to produce top flight results. However, this is ‘only’ an APS-C sensor so the edge of the frame (usually a weakness in cheaper lenses) isn’t in the picture. Maybe this lens could be useful – unfortunately it’s only around a 28mm equivalent when the 1.6 crop factor is taken into account so it’s not that exciting an effective focal length. The minimum focus is 25cm.

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In use it’s nicely balanced as the lens is all metal and quite heavy. Apertures run from f3.5 to f16, and there’s a depth of field scale on the lens. This indicates everything in focus between infinity and 0.5m at f16 – this is misleading as it doesn’t work as accurately on APSC – to be safe use the setting for one stop less than the aperture set.

The focus mechanism is smooth and even, and focussing is difficult through the viewfinder as the depth of field is huge. For critical results use the LCD and ‘focus magnify’, or stop it down to f8 and use the depth of field scale on the lens and don’t focus at all!

One thing worth pointing out about the lens mount adaptors  – they only allow ‘stop down’ metering. Most cameras use ‘open aperture’ metering – keeping the aperture wide open until exposure, keeping the viewfinder nice and bright to allow for easy focussing and composition. The manual focus adaptors use ‘stop down’ metering where the aperture set is the one in use at all times  – at f16 the viewfinder gets pretty dark. If this is a problem the LCD image will always remain bright even as the aperture closes.

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Being an ultrawide this has a large front element – the filter thread is 67mm which means filters aren’t cheap!

So – the test subject – used for several posts on film as well as digital :-

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This was taken at f8 – very pleasing colours, contrast and sharpness. Some clumps of snowdrops as an added bonus!

The samples are taken from the centre by the dovecotes, and the right where a red car is parked.

First samples at f3.5 and surprisingly good in the centre but the edge is a bit vague. There’s also an overall light ‘sheen’ to the image which is common at max aperture and may be caused by light bouncing around the mirror box onto the sensor – this hasn’t helped the contrast of the image. However these are extremely small samples and this would be perfectly good printed to 10×8 inches.

f3.5compAt f8 (5.6 was almost identical) and a dramatic improvement! Razor sharp in the centre and the edge is pretty good too.f8comp

f16 -even more of an improvement at the edge and a slight degradation in the centre – sharp across the frame and certainly showing no signs of diffraction.

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Finally – edge chromatic aberration – taken from the very top left of the main frame. Perfectly acceptable at f8 and not too noticeable at f3.5. I’m amazed!

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As we’re only using the centre of this lens’s image circle, there isn’t that much barrel distortion either. ‘Bokeh’ is almost impossible to judge as the extreme depth of field means that virtually everything is in focus.

So – is this useable?

Yes – and this is a genuine surprise to me – just one stop down at 5.6 it’s very good, at f8 to f16 the results are excellent.

All good so far but this focal length is already covered by kit zooms at around f3.5 so there’s no speed advantage. However, the resolution, chromatic aberration and contrast at f5.6 to f16 are better than I’d expect from a kit zoom lens.

So if you’re a prime lens shooter, or want something better at the wide end than the standard offering this might be for you.

It’s also pretty useful on an Olympus OM 35mm film camera so can happily live a ‘double life’!

It’s around £100 second hand in the UK, with a lens mount adaptor costing anything between £20 and £150 (which you can use for all lenses of the same mount obviously).

Hope you find this useful – thanks for looking.