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Canon EW-73C lens hood from modifying an EW-73B

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A cheaper Canon EW-73C lens hood from modifying an EW-73B

Quick modification of a 3rd party lens hood for the EF-S 10-18mm

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Keith recently reviewed the Canon EF-S 10-18mm F4.5-5.6 IS STM lens, using his Canon 100D (SL1).

Canon does not supply lens hoods with its cheaper, non ‘L’ category lenses, and the recommended EW-73C lens hood costs at least £25.

Canon lens hood

The older EW-73B hood is designed for a longer focal length lens (EF-S17-85mm IS USM and 18-135mm STM), but can be found on eBay for around one tenth the price of the Canon version.

In this article, Keith shows the simple modifications to the cheaper version, to use it with his 10-18mm lens.

Lens Hoods

I only use lens hoods on a few of my wider lenses, when absolutely needed, or when they are built-in to the lens body, such as with the EF15mm fish-eye, and EF 14mm 2.8L II

With the new 10-18mm lens, I was looking for something more to protect the front lens element from knocks than protection from direct sun.

At 10mm, the field of view is so wide that avoiding the sun (or other lighting sources of flare) is always going to be tricky.

However, at 18mm, the reduced field of view needs a lens hood that’s longer than you have.

This longer hood would intrude into the image at 10mm.

Such are the problems of lens hoods with wide zooms…

Here’s the non branded hood I got for less than the price of a pint of beer.

EW-73B lens hood style

It fits the lens fairly well, but at focal lengths below ~11mm, the petals intrude into my image.

You might think it would be the longer ones, but actually it’s the smaller ones at the side.

part of plastic that needs to be removed

Here’s a shot at 10mm.

effect of wrong size lens hood at 10mm

The ‘finger test’ can be used to get an indication of how much of the smaller petals might need removing.

using your fingernail, to get estimate of plastic to remove


A rough estimate of where to remove some plastic is drawn on the hood, with a non permanent marker (permanent markers might start to ‘melt’ the cheap plastic).

initial estimate of how much to modify the lens hood

Draw the lines on each side before starting to remove the plastic. This makes it easier to get the same profile on each side.

I’m using a Dremel tool to file away the plastic – you could use a file, the plastic is fairly soft.

Don’t use the Dremel at too high a speed since the plastic will just melt.

dremel tool with sanding attachment

Here’s part way into the cut.

I’ve put it on the lens to check the effect – DO NOT file the plastic whilst the hood is attached to the lens…

After initial test for remaining vignetting

After doing one side, I went out to photograph the sky.

not quite there yet

Note that there is still a tiny bit of the hood intruding on the right side.

It’s important to check actual captured images, since the viewfinder only shows some 96% of the true field of view. I do have to keep remembering this since I’m used to the 100% coverage of the viewfinder on my Canon 1Ds3.

After a few more trials, no more vignetting at 10mm.

finished lens hood modification


Very easy to modify.

The plastic is soft and the ground edges can be finished to a reasonable finish with an emery board such as used for sanding fingernails (be careful in sourcing these, since the black plastic dust will not be appreciated should someone want to use the board for nails…)

The final shape of the small petal was reduced a bit more than my original estimate, as shown here.

where to remove plastic

Buying the EF-S 10-18mm F4.5-5.6 IS STM lens

We make a specific point of not selling hardware, but if you found the review of help please consider buying the lens, or any other items at all, via our links. It won’t cost more, but we do get a small contribution towards running the site (thanks!).

In the USA: Amazon | B&H | Adorama
In the UK : Amazon UK 

Park Cameras – where Keith gets his new Canon kit in the UK.

The plastic can easily be given quite a smooth finish.

For my more expensive lenses I have quite a few genuine Canon lens hoods, but for something I’m going to carry round factories and building sites (as my ‘backup’ camera), this cheap version will suffice.

At the price I’ll also not be too troubled when I forget it and leave it somewhere…

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All articles and reviews are listed on our main Articles and Reviews page, or use the search box at the top of any page. Experimental items, hacks and how-to articles are all listed in the Photo-hacks category Some specific articles that may be of interest:

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