Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Won't any 58mm filters screw on directly to the SX40 without an adapter?
Document: I rarely review items at all, but after I received this item, I felt compelled to do one. I have the SX40 HS and it's a perfect fit and I can use any 58mm filters with it. I just noticed that I ordered from the same seller on eBay. The service is excellent. And my order came very quickly. Can't wait to receive my other items in the mail!
All fits as described, I recommend this product, the adapter ring fits perfectly and the UV filter works as well, and the good thing about this adapter is that you can use other 58mm filters.
I purchased this purely for protection of the lens on my son's CANON POWERSHOT SX40 HS since he is still a bit young (9). The adapter works great and accepts the included filter, though I'm still a bit peeved that Canon designed the camera without a true threaded end. I am not too worried about the picture quality, but if it were my camera I would likely spend a bit more on the filter.
Arrived quickly and as described with adapter ring, 58mm uv filter, and lens cloth for my SX40 HS. Suggest purchasing a 58mm plastic lens cap if planning to leave the filter on the camera permanently.
The adapter Ring and filter themselves are pretty standard. They fit my powershot SX40 great, snug as a bug. Mostly I want to complement Goja's customer service, quick delivery and rapid response to a followon question I had. / One thing though, since you are adapting to a larger 58mm lens size, your 52mm cap will no longer fit, so buy one of those as well... Goja has bundle with the lens cap included.
This is a good product and snaps right on to my cannon SX40 HS. I can add a protective UV filter, polarizer or any other attachment that is 58mm. Fast and courteous seller.
This adapter fits my SX40 HS perfectly. Nice and snug. A note with the item shows their attention to customer service. With a 100% satisfaction responsibility to the customer. Fast, quick shipping response. with it arriving right on the first date of ETA. Very pleased with Digital Goja. Would recommend to anyone considering this purchase to take the leap.
As I stated in many other reviews the adapter is a must have for the Canon SX40 HS and works well on the Canon SX30 IS as well.Goja customer service is second to none.The UV lens is well junk. I have several of them because it took me a while to find the adapter by Goja alone as a purchase. All the lens are still in the packaging in a closet. The lens made the photos look really bad, they actually did the opposite of what they were meant to do.
Items arrived when promised in working condition. Packaging was adequate. Fit perfectly on my Canon SX50. Even came with 2 cleaning cloths. I'm now ready to use the camera without concerns of damaging the primary lens with the filter in place.
Lens adapter fits like a glove! Gives me 58mm optional lens capability. I see no reduction in the quality of my photos. Good price great service.
Answer: No, the SX40 is 52mm so if you want to use a 58mm filter then you require and adapter that is 52mm thread on the end that attaches to the camera and 58mm thread on the other end to attach the 58mm filter. As for this particular item that you are looking at I did buy it for the filter only as the lens isn't very good, its a definite you get what you pay for thing. However Goja sells the adapter by itself and its pretty cheap, I bought an adapter for each filter I own because if you torque this even a bit too much it gets stuck to the lens and well that can mess up a shoot if you are required to changed filters for any reason or if the lens gets scratched and you want to replace it.