rcarol wrote:
Actually, your SX-20 didn't have a 560mm lens. It has a lens that's equivalent to a 560mm on a full frame camera. For you to have the same reach as your SX-20, you need a 350mm lens for your 1000D APS-C camera.
The above is correct.... Please note that with your point-n-shoot camera you stated it has a "560mm lens". It doesn't. The lens' actual focal length is far less than that, but the camera uses a tiny little sensor and that makes the lens "act like a 560mm" would on a film/full frame camera. The 560mm number is an "equivalent"... not a real focal length.
The Canon 1000D you've got now has a much larger sensor than your point-n-shoot camera (which is one reason it will give you better images). HOWEVER, it's still smaller than full frame. As a result, a 300mm lens will "act like 480mm"... or a 400mm lens will "act like 640mm" would on full frame. Take these equivalents into consideration while shopping, to get something that gives you focal length "reach" most similar to what you enjoyed with your point-n-shoot camera. (A 350mm lens on 1000D would be the same as your point-n-shoot, but there aren't many 350mm lenses made.
In other words, you could get a 300mm lens for the 1000D and have almost as much "reach" as you enjoyed with your point-n-shoot.... or a 400mm or longer lens would actually offer more.
Some possibilities:
Try to find a used Sigma 50-500mm OS HSM or 150-500mm OS HSM or 120-400mm OS HSM in Canon EF mount. These are discontinued models from a few years ago now (before being replaced by 150-600mm lenses), but probably would give you the most "bang for your buck".
The 50-500mm is larger, heavier and usually more expensive, but is the sharper of the two. KEH has several examples for $765 to $932 (
https://www.keh.com/shop/sigma-50-500mm-f-4-5-6-3-apo-dg-hsm-os-lens-for-canon-ef-mount-95.html)
The 150-500mm is a bit more reasonable size, tho still pretty big. It's also a bit less sharp in the 400 to 500mm range of the zoom.... KEH has one for $658 in EX+ condition right now (
https://www.keh.com/shop/sigma-150-500mm-f5-6-3-dg-os-apo-hsm-auto-focus-telephoto-zoom-lens.html)
The 120-400mm is still big, but the smallest and lightest of the three, more "hand holdable" and closer to your price... tho it comes up a little short. KEH has a couple in "Bargain" condition (lots of wear and tear) for $373 and $405 (
https://www.keh.com/shop/sigma-120-400mm-f4-5-5-6-dg-os-hsm-auto-focus-telephoto-zoom-lens.html)
All three of these Sigmas are "OS" or image stabilized versions. There were earlier, non-stabilized non-OS versions too... But I'd recommend the OS versions. With these very long focal lengths you're likely to want image stabilization. Even with OS, you may want a tripod or at least a monopod to work with these lenses. You can look up their dimensions and weights online.
There's also a new Tamron 18-400mm VC (stabilized) that's more compact than any of the above. Too new to find used ones, though, and it sells for $600.
Tamron and Sigma are also both now making 100-400mm lenses, which are considerably smaller and lighter than the above lenses. These are selling new for about $800. Between the two, I'd go with the Tamron because it can optionally be fitted with a tripod mounting ring, which I consider necessary on a lens that reaches 400mm. You won't find these lenses used or discounted very much... they are too new for that yet.
Canon's original 100-400mm L (push/pull zoom) was replaced by a new version a couple years ago and can now be found used for a lot less than the "II". KEH has a couple of them available: a "bargain" for $628 or one in "excellent" condition for $861 (for comparison, the 100-400 II is selling for about $2000 new). The push/pull 100-400mm has been popular with "birders" for it's fast zoom capabilities... especially for birds in flight. It's also pretty hand-holdable at around 3.25 lb. (the II is a bit heavier). Of all the lenses listed here, the Canon 100-400mm would have the best image quality and likely the best built/durability. It's also "future proof" for Canon cameras (some older third party lenses such as those Sigma won't work properly on later DSLRs... tho I haven't heard of any issues between the above models and any Canon DSLRs).
Unfortunately, any lens over 300mm tends to get pretty expensive. Teleconverters generally won't work with shorter, more affordable lenses... too much loss of image quality, autofocus won't work and your viewfinder will be too dim to see to manually focus.
But if you could "live with" 300mm.... actually only a little less reach than you had with your point-n-shoot (but a much more "croppable" image with the larger APS-C sensor in your new DSLR)... there are some good lenses you might consider. A pretty darned good lens that's easily hand held, the Canon EF 70-300mm IS USM was discontinued a year or so ago and can easily be found used for $200 to $300 (the current "II" version of it is on sale for $450 right now). There also is a slightly more premium Canon EF 70-300mm IS "DO" USM, more compact but about the same weight, which can be found used for around $350 to $450 (DO = "diffractive optics", a special design Canon uses in some lenses to reduce their size). And there is the Canon EF 70-300mm "L" IS USM, the most premium version and the only one which can optionally be fitted with a tripod mounting ring, which sells for $1350 new, about $1000 used.
AVOID Canon EF
75-300mm "III", in particular. It's often really cheap ($200 new, $100 used)... but it is not Canon's best effort. It doesn't have all that good image quality, has slower/noisier micro motor autofocus and doesn't have image stabilization. You can do much better for just a little more money.
There are older manual focus lenses, mirror lenses and such that might be made to work. But they will be slower to work with and limiting in various ways. Previous responses have mentioned some of the options. Over the years I used 4 or 5 different mirror lenses. The best of those I ever used was a Tamron SP 500mm f/8 "Adaptall-2" lens. There were two versions of it, very similar except the original "55B" model has a built in tripod mounting ring, while the later "55BB" doesn't. (I consider the tripod ring essential, especially since this old lens doesn't have image stabilization.) These can be found easily for under $200, hopefully with the tripod ring AND the lens hood (which can be difficult to replace if missing). It doesn't matter what mount is on the lens, because they're interchangeable. Adaptall-2 mounts are still being made in China and are available to fit Canon EF. I use an old Tamron 90mm Macro with Adaptall mount... manual focus (and manual aperture), but high image quality and cheap. The lens cost me $20, came with a Nikon mount... an Adaptall from China (eBay) cost $40 and only took 4 days to arrive. $60 for a high quality macro lens, not bad!
All these were shot with that Tamron SP 500mm f/8:
The image of the white egret above shows one of the idiosyncrasies of mirror lenses... the "donut" shaped out of focus highlights in the background. In my opinion, the Tamron did better minimizing this than most mirror lenses (at least all the ones I tried). The image of the orange canna flower demonstrates another interesting feature of this particular lens: It's very close focusing, to about 5 feet (most non-mirror 500mm lenses can't focus closer than 15 or 20 feet). However, these are manual focus lenses. Slow to work with when trying to shoot faster moving subjects. And the 500mm "mirror" have a fixed aperture... f/8... which makes for fairly dim viewfinder to try to manually focus. Modern DSLRs like the 1000D aren't very "manual focus friendly" either.
FYI: There was also a Tamron SP 350mm f/5.6 Adaptall-2 mirror lens, also quite good and even more compact, but without any tripod mounting ring. It's far less common than the 500mm and usually brings a higher price on the used market.
If you can "live with" 300mm ("480mm equivalent" on a 1000D), one of these would probably be your best bet:
https://www.keh.com/shop/canon-ef-70-300mm-f-4-5-6-is-usm-telephoto-zoom-lens.htmlhttps://www.bhphotovideo.com/c/used/397663/Canon_0345B002_EF_70_300mm_f_4_5_6_IS.htmlIf you prefer, that lens is even still available new (hasn't been discontinued for very long):
https://www.bhphotovideo.com/c/product/397663-USA/Canon_0345B002_EF_70_300mm_f_4_5_6_IS.html