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If you can fit a filter to the front of your lens, you could buy a wide angle adapter like a 0.5, with the screw size that fits your filter screw.
But the wide angle front lenses, were designed for compact camera's and video camera's And although the 18 mm could become like 12 mm, but you will introduce colour fringing, distortion and more , that can't be corrected in normal programs like Lightroom.
I used a wide angle 0,5x (52mm) Hama and a tele 1,5x from cannon, on my video and later on my canon powershot G9, to find I was looking for a DSLR. I never was quiet pleased with the results.
And yes, sometimes you can't go farther back, but then I shoot 2 or 3 pictures.
Now I use a 12 - 24 on my Nikon DSLR. Now I get the pictures I want in a quality that fits.
My 0,5 and 1,5 are somewhere in a box. I payed the same (new) for both as for my Sigma 12-24. With the sigma I do have fun.
Getting functionally useful adaptors from any other brand to Canon EOS is difficult as the register distance from the sensor to the lens is the deepest of all current lens mounts. Adaptors therefore require expensive optical correction in order to preserve infinity focus ability and given that the adapted lens will still be substantially crippled most owners aren't prepared to pay for such an adaptor. In any case, the additional optical elements will reduce optical quality.
Due to similar electronics, it is possible to physically convert a Sigma mount lens to EOS by fitting an EOS lens bayonet but it's a skilled job requiring fabrication skills and even then there's no guarantee that the lens will communicate correctly with all EOS bodies. In practice, due to the scarcity of Sigma mount lenses the conversion is usually the other way around.
Sorry, you can't. It's all or nothing, so you need to purchase a complete replacement VCL-0637H or you can buy some excellent quality and vastly cheaper lens converters directly from Chinese suppliers on eBay.
If you are talking
about canon only (not sigma/ tamron etc) lenses then there are many
different variations of the above lenses ranging from a few hundred to
over a thousand UK pounds ( I dont know your currency/country) If you
are looking at the budget market then the best value
of the 3 mentioned id the 55-250 by canon which has good optical
quality and built in IS (Image stabilistaion) and is remarkable value
for a CANON branded lens
You have named several excellent digital SLR cameras aimed at the top end of the amateur/semi professional market.
I have the Nikon D200 and have been very pleased with it.
As stated by JCDill, you must really decide what you want and can afford. The camera body you choose will commit you down one path or another. For example, if you choose Canon, only Canon or OEM (Other Equipment Manufacturers) such as Sigma lenses will fit your camera body. Canon have a good reputation for their auto-focus, while Nikon make lenses that are the envy of others.
If this is your first digital SLR then you might be best buying an entry level body with a multi-purpose zoom lens such as the Nikon D40. There is a lot to learn.
If you are converting from film SLR and already have a set of lenses, then the cameras you mentioned will probably be able to use your existing lenses (but this is less so with Canon than Nikon). I was ecstatic to disover that my old Nikon 500mm mirror lens works in manual mode (with metering displayed) on my Nikon D200 but would not work properly on my Nikon D70.
I hope this helps.
As simple as this may sound, have you cleaned the lens lately? A lot of image quality deterioration comes from a finger print or other smudge on the lens. Digital cameras are succeptable to even the smallest gunk on the lens. Because the lens element is very tiny, use a cotton swab with a drop of lens cleaner (or isopropyl alcohol) to thouroughly clean and dry the lens. If it isn't a dirty lens, check your file-size and flash settings.
I bought a Hama skylight filter for the express purpose of protecting the lens. I've not noticed any degradation in image quality. Of course, ultimately the filter will block some of the light that's hitting the CCD, but it's so little as to not be noticeable.
Being as the lens cap clips into the thread of the lens then yes, it does still fit perfectly into the thread of the filter, so no problem there!