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Thread started 15 Oct 2009 (Thursday) 13:54
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Rebel XS and "L" lenses - autofocus queston

 
anothernewb
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Oct 15, 2009 13:54 |  #1

OK- forgive me if this has been answered before, tried to search a bit but kept coming up with more of the xs/xsi debate that wasn't exactly relevant.

To the point. Does the XS have an accurate enough AF system to reliably use with a 70-200 F4.

As per the specs the rebel xs has a center cross type sensor that's for f5.6 lenses whereas other cameras are eqipped with cross types are good for 2.8 lenses.

Now - I want to purchase a 70-200 F4 for the XS, Given all other factors being equal and the body is correctly calibrated - with the len's max aperture at F4 - and as I understand such things - the XS's focus system should be acceptable with this combination.

Is there any real reason to step up to a body with a faster AF sensor if I don't have any primes or zooms faster than F3.5. As I understand some things - if you look at the raw numbers it seems like a "duh" since F4 will never trigger the higher sensitivity system present in the other cameras and so the sensor of the XS should be more than sufficient, and almost ideal. OR is it possible that the systems with the 2.8 center point are more accurate in general?

Am I correct with my assumptions - or am I just getting hung up on techie crap?

Someday I "may" move to a 2.8 zoom like the 17-55, which would then necessitate a more accurate body. Although the likelyhood of moving to that grade of lens anytime soon is probably on par with getting hit by a meteorite. I have owned the tamron 2.8 and found it to be a great lens - but I found I liked the background separation and the overall effect far better when shooting people with the longer focal length of 55-250. Depending on how finances go for me - (right now - lke everyone else - it's forced some downsizing in my hobbies...) my only other upgrade plan is to try the 15-85 that's due out soon. I was able to borrow a 17-85 and found it to provide a bit more detail on cropped pictures than the kit lens (which I am not dissing at all - that thing is still probably beyond my photography skill at the moment...)


Gripped 80D,10-18 STM, 55-250 IS STM, 15-85 IS USM, 85 1.8, 10-400 II, 430 EX II

  
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gonzogolf
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Oct 15, 2009 14:23 |  #2

Unless there is a major secret I dont know about the xs will focus fine with the 70-200f4. I suspect you are getting caught up in techie crapt to a degree. That being said, if you are into photography to the point of buying quality glass I would politely suggest that for the meager cost of an upgrade (used for used) you might want to step up to the 30d 40d 50d line of bodies. There is a significant upgrade in focusing speed, improved controls, and features. The xs was designed to be an slr lite, and while its a great beginner camera I think you might benefit from stepping up.




  
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apersson850
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Oct 15, 2009 17:05 as a reply to  @ gonzogolf's post |  #3

Cameras like the 50D, which has nine AF points and where all are cross type, and in addition has a separate cross type sensor with high precision in the center (assuming f/2.8 or better) as well as additional extreme defocus sensors will in general have better AF performance than you could expect from a 1000D.

If you purchase higher quality, which usually also implies heavier and larger, lenses, you may also find that the camera body of the 1000D is a bit small to balance these larger lenses.

However, one thing is for sure. You are adhering to the principle of putting the brunt of you money on lenses, not camera bodies.


Anders

  
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shayneyasinski
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Oct 15, 2009 18:01 |  #4

back when all I had was an xti I bought a 70-200 2.8 IS and thought that my camera was all I would ever need and I was right , that is till I was given a 40d!

I also have an xt ( paid $100) and all my lenses work good with no problems but it depends on what you are shooting I guess.

faster focus and more controll is easy to upgrade to but very hard to give up.


my gear Canon 7D, Canon 5DMK2, 70-200 f2.8 IS, 50mm f1.8, canon 430 speedlight, canon 17-55 2.8 IS, canon 100mm macro sigma 10-20, Canon 17-85 , 60 cokin filters , 2x telecoverter.

  
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anothernewb
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Oct 15, 2009 18:27 |  #5

I did have the 17-55 2.8 on the xs for a time. For the most part I would say that it was OK to handle for awhile. after a few hours though, I could see where having a slightly larger body would have been a better balance.

Well - as far as upgrading the bodies go, XS's aren't exactly in high demand used. and I'd need to get at least 350 out of it to make it worthwhile. I think that's pushing the used market a bit. I could in theory trade it in at a local shop for an xsi and be all right. but at $800 (after trade in) for a 40d there - means there will be no new lens for another year - and gold only knows what the dollar will be worth in another 12 months.

So that brings me to back to the penultimate xs/xsi debate - is an XSI enough of an upgrade to make it work. I think I have read that it's system is similar to the xxd systems. Is that correct? That route will only run me about $300 - which leaves me lean - but enough to still get a 70-200 used, although there's an element of risk there with betting an abused copy. I've had OK luck buying used - but certainly not better than the 50/50 mark.


Gripped 80D,10-18 STM, 55-250 IS STM, 15-85 IS USM, 85 1.8, 10-400 II, 430 EX II

  
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johnbachel
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Oct 15, 2009 18:30 |  #6

If you want the 70-200, it will work on the XS. As far as the XSi goes, the focusing is similar to the XS. You can make the move to a better body when you have the $$.


John

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Equipment: 50D, Sigma 17-70 f:2.8-4 OS, Sigma 70-300 OS, Metz Mecablitz 48 AF-1 strobe.

  
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gonzogolf
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Oct 15, 2009 21:28 |  #7

Anothernewb I bought a used 30d in like new condition recently for $400. I would think you could get enough from your xs to move up into that range. Look at the buy and sell forums here, I think you might be underestimating what your xs might be worth on craigslist and overestimating what a replacement might cost.




  
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Rebel XS and "L" lenses - autofocus queston
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