Tag Archives: efs

Commentary, Equipment

New Canon Instant Rebates on Lenses

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It looks like new rebates are available on Canon lenses, at least via B&H Photo/Video. Given the recent increases in Canon lens list prices, this may be a good opportunity to save some money on that lens you have been waiting for. The list of eligible lenses includes some very popular ones.

If you are ready to spend over $5000 on a 200mm f/2 lens (!) you can save $500. Many other lenses offer instant rebates in the $100-$150 range with some less-expensive lenses offering smaller rebates. Lenses available under this offer include:

Equipment

Canon 7D Rumors

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Speculation about a new DSLR and several new lenses is running wild on photography discussion boards this week. The current rumors, at least as of Friday evening, involve a new Canon “7D” that is supposedly a cropped sensor body with a 18MP sensor. Other features reputedly include HD video and a rather fast frame rate of 8fps. Judging from the “7D” designation it would be positioned between the 50D (or 60D?) and the 5D2 and below the current cost of the older 5D.

While I have little to offer – nothing, actually – in terms of real information about the rumors that are currently floating around about a new Canon DSLR. But, heck, if everyone else can speculate, why can’t I?

Continue reading Canon 7D Rumors →
Commentary, Equipment

‘Low End’ Cameras – Interesting Choices

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An interesting juxtaposition caught my attention this morning.

Yesterday Michael Reichmann posted a very interesting article (“You’ve Got to Be Kidding“) in which he compares the image quality from the (arguably high end point and shoot) $500 Canon G10 with that obtained from his high end Hasselblad medium format digital system. While some are misrepresenting the point of his article to be that the G10 is equal to the Hassy MF system (it isn’t, and he didn’t write that), the significant point is that for many uses the G10 can produce good size prints (13″ x 19” in Reichmann’s article) that are largely indistinguishable from those that came from the MF camera.

At about the same time I saw a link to a dealmac.com posting about sub-$600 prices for the Canon XSi 12.2MP APS-C DSLR with the quite decent EFS 18-55mm image stabilized lens. Anyone who looks at the features of this camera objectively and knows about the generally quite good reviews of this lens understands that this is a tremendous value for a camera system that is more than capable enough for the vast majority of DSLR purchasers.

So, on one hand we have a small almost pocketable camera (the G10) that can produce excellent quality prints as large as most people will ever produce (much larger, in fact). If your point of comparison is DSLRs of a year or two ago – $1000+ in many cases – this is a quite amazing thing, and could induce many buyers to think about the G10 or a similar camera, either as the camera or as an adjunct when traveling light is important. But wait, the cost of a quite decent DSLR isn’t $1000+ any more – it now appears to be perhaps only $100 more than that of the G10.

Equipment, Tests

Corner Sharpness of the Canon 17-40mm f/4 L Lens on Full Frame

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Since the question of how the Canon EF 17-40 f/4 L performs across the frame for landscape photography comes up periodically, I have posted an older test photo I made last year (2007) – updated here to include a comparison corner and center sharpness.

Canon5D17_40f16CornerVsCenter.jpg

Technical data: Canon 5D. Canon EF 17-40mm f/4 L lens. Focal length: 17mm. Aperture: f/16. Shutter speed: 1/60 second. Shot on the tripod with MLU and remote release. If the full image were reproduced at this resolution the print would be about five feet wide. (Not that I’d do that – it is a really boring photograph! :-) In a more typical size print the corners would like very good, indeed.

A 100% crop would not be expected to be “razor sharp” – and we see typical results here. It is impressive to see how well the corner image quality holds up – despite the fact that grass is one of the most challenging subjects for a digital sensor and the fact that this part of the scene was much closer to the camera than the focus point in the center of the scene – i.e. the corner section showing the grass is only a few feet from the camera, and the camera is focused hundreds of feet away on the objects in the center of the frame. (On that subject, I’m convinced that a good number of the reports of “poor corner performance” in ultra wide lenses are actually due to the subjects in the corner being much closer to the camera position than the subjects in the center of the frame, especially when the “tests” are done by shooting actual landscape subjects.)

BOTTOM LINE: What does this tell us, how do we view this in the context of reports of soft corners on the EF 17-40mm f/4 lens, and what does this mean for anyone trying to choose a wide (or ultra-wide in the case of full-frame cameras) Canon zoom lens?

While this lens is soft in the corners when shot wide open, the lens is not particularly soft in the corners when stopped down. If your primary use for such a lens is, for example, shooting very low light handheld wide angle photographs the 17-40 is perhaps not your best choice. (The EF 16-35mm f/2.8 on full frame or the EFS 17-55mm f/2.8 IS on a cropped sensor body could be more appropriate zooms.) On the other hand, if you are primarily interested in subjects that are usually shot at smaller apertures (urban/wild landscapes, architecture, etc.) then the 17-40 can be an outstanding lens – though this is more true on a full frame body than on a crop body, given that you are unlikely to use the smaller apertures on a crop sensor body given the diffraction blur issues there. So, to state it very succinctly…

… the Canon EF 17-40mm f/4 lens is an excellent lens for shooting deep DOF small-aperture photography on a full-frame camera. (It is OK but not necessarily ideal for use with cropped sensor bodies, where I would prefer the EFS 17-55mm f/2.8 IS.)

G Dan Mitchell is a California photographer whose subjects include the Pacific coast, redwood forests, central California oak/grasslands, the Sierra Nevada, California deserts, urban landscapes, night photography, and more.
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Text, photographs, and other media are © Copyright G Dan Mitchell (or others when indicated) and are not in the public domain and may not be used on websites, blogs, or in other media without advance permission from G Dan Mitchell.