Not sure if you should try this at home though it worked for Mathieu Stern as you can see in the video below.
What is it about? Instead of using a lens cleaning pen, you can do the same job with a candle, a spoon and a microfibre cleaning cloth. The tip of a lens cleaning pen is covered by “carbon cleaning compound”, which basically is soot. Soot sticks to oils and fats and hence works perfectly with those fingerprints on your precious lens. What is shown in the video is how to make your own “carbon cleaning compound”.
Watch the short video below carefully before trying it. Be aware that soot is a gentle abrasive, but still an abrasive. Using this trick too often might damage the lens over time (though it seems to work fine for Mathieu Stern).
Hi Lows Note spotted a Canon patent application (2018-197774) for an RF 28-70mm F/2-2.8 lens for the EOS R system.
Focal length: 28.68 – 67.90mm
F number: 2.26 – 2.91
Half angle of view: 37.03 – 17.67
Image height: 21.64 – 21.64mm
Lens length: 149.69 – 174.43mm
Back focus: 20.57 – 35.45mm
The interesting fact: the lens literature does not refer to an image stabilisation group inside the lens. Some people is saying this is a sign for IBIS (In Body Image Stabilisation) coming to future EOS R models (rumors already surfaced). We are not sure how to interpret this.
Canon always stated the superiority of image stabilisation in the lens. Never the less, Canon execs didn’t exclude the possibility of a future mirrorless camera with IBIS, and there are a few patents clearly discussing IBIS (patent 1 | 2 | 3).
Do you think this patent application is a clear sign of IBIS to be featured on future EOS R cameras?
Canon in an unusual move for the company already disclosed the the EOS R lens roadmap for the next years (also see this interview). The lens described in the patent application doesn’t seem to be on Canon’s immediate agenda. Keep in mind that patents are a way for companies to secure they research and development and hence their intellectual propriety. A patent application rarely means a product is coming to the market soon.
More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production in the next few years are these:
The spring-loaded adjustable collar collection is something of a mystery to us and will remain so until we can spend some days doing optical adjustments on one. The use of the same motor as the RF lens is very interesting in several ways. Only some more tear downs will tell us if this is just a superior motor type that Canon is going to use in all electrically focused lenses (I suspect this is probably the case), or just in lenses with a lot of glass in the focusing element (another likely thing).
Canon has really been very quiet about this lens, despite the known changes inside. I had a lot of trouble finding out which elements are fluorite (two of them are, apparently). There has been some talk about improved focusing speed and accuracy, which I assume has something to do with the new electronic focus system, but not much.
The teardown is explained step by step with a lot of pictures, see it here.
He used the RF 24-105mm f/4L mainly as a landscape lens while capturing Japan’s Fall colors.
In the conclusion Alik says:
The Canon RF 24-105mm f/4 is very sharp with great image stabilization, outstanding contrast and color rendering, nice pop with only some minor yet, easily correctable flaws. Build quality is also really solid and the lens isn’t too heavy either. The best part is the price.
For the landscape, travel photographer, the Instagrammer that wants to shoot a reflection the golden gate bridge through a chain link fence off his smart phone, or whatever it may be, this lens is outstanding for all casual shooting styles.
The lenses main weakness is the f4 aperture. You’ll notice most of [the photos in Alik’s review, editor’s note] are of landscapes and travel. I just haven’t been in love with any portraits I’ve shot. It’s fine for shooting portraits with an awesome backdrop where it’s all about the environment, but when it comes to shooting beauty portraits, you’ll most likely eventually want a faster lens ( faster lens means f2.8 or f2 something like that ).
However, if you’re in a studio shooting models against a backdrop where it’s all about fashion, production design and hair & makeup and less about bokeh, f4 is great. You’ll even get a little more pop if you’re using strobes, which means really stunning, high contrast punchy images. I haven’t tested yet, but I can almost bet you this lens has more pop than the 28-70mm f2 which will need massive glass to produce that aperture. Something to consider if you plan on shooting at f4 or f5.6.
I actually really love this lens, and it’s the first zoom lens I’ve used in a long time where I don’t feel like I’m really compromising quality for versatility. I usually don’t say this in my reviews, but if you’re stepping into the EOS R system, and you don’t have the EF 24-105mm f4, you should seriously consider this lens!
Alik Griffin’s complete review of the Canon RF 24-105mm f/4 comes with a huge set of beautiful sample pictures, and examines thoroughly all aspects of this lens. Be sure to have a look.