Three things you’ll need:
Compressed air – We use air compressors from Home Depot (<$100) but the smallest compressor you can find is likely up to the task. If you don’t want to splurge on a compressor, there are the ubiquitous cans of compressed air available at any computer store. When using these cans always keep the can level and upright to avoid blowing its liquid propellant onto your lens elements. These chemicals can do weird and potentially harmful things to lens coatings, so please be careful. If you want to avoid chemicals all together, get a bike pump style canister that you pump up then use, or try a simple manual pump like a Giottos Rocket Blower.
Lens cloth – Our favorites are cheap, Promaster-branded microfiber cloths. You’ll notice that some types feel very slick and smooth against the glass and others gain some traction and drag more. We like the kind that has some drag and feels sticky against clean glass.
Cleaning fluid – You shouldn’t need any cleaning fluid except for the most stubborn and difficult cases. Again, we like the Promaster brand because it’s cheap and cheerful. The stuff we use comes in a clear plastic bottle with a pump atomizer spraying attachment.
Your lens is dirty. Now what?
It’s now time to touch the front element of your lens and clean it. If you are worried about rubbing the coating off, don’t be. We’ve never seen it happen, ever.
To clean a lens’ front element all you need is a set of lungs and a lens cloth.
1. Breathe on the lens enough to fog the whole element, then wipe the lens with a good amount of force in a circular fashion. You’ll likely be left with a smudge where your wipe stopped and some junk around the edge where the glass meets the body.
2. Make a little point with the cloth, breathe on the lens again and wipe the edge in one 360+ degree motion. Now you should be left with a mostly clean lens.
3. Now repeat the wipes, but with ever decreasing pressure. The last few swipes should be done very lightly. The trick is to buff the lens, which will pick junk up rather than moving it around forever. Keep rearranging the cloth so that you are using a virgin bit of material and not re-contaminating your almost-clean glass.
4. The final step is examining – and cleaning – both front and rear caps thoroughly before affixing them to your now-clean lens. A dirty cap will undo all your hard work in an instant, so examine both caps closely, blow on them from many angles with compressed air and only when you are certain they are clean can you affix them to your lens. If you use a UV filter, also make sure it is clean before you put it back on.
And with that, we’re finished. If you enjoyed that you should consider working for BorrowLenses.com – You could be cleaning gear all day long and getting paid to do it!