DSLR lens queries

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#31 Jul 29th, 2011, 12:04
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#31
Currently EF-S 18-55 IS is only in my bag.
#32 Jul 29th, 2011, 12:04
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#32
@dipsudipta: With your 7D, the 11-16 lens will be equivalent to (approx.) 18-25mm full frame (35 mm). This is super wide angle to wide angle range, not a walk around. If you're looking for a walk around lens, the 17-50 mm (28-80mm equivalent) is better.
#33 Jul 29th, 2011, 12:10
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#33
arindamdas: I couldnot understand. Is TOkina 11-16 is for Full frame camera focal length. If it is then with APS-C size camera it will be 11*1.6-16*1.6 equivalent focal length.
#34 Jul 29th, 2011, 12:12
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#34
yeah, when you mount it on a full frame camera, it will behave like a 11-16 mm lens. But the 7D is not full frame. When you mount it on a crop sensor camera with a 1.6x crop factor (which the 7D is), the range (field of view) is effectively 11*1.6 - 16*1.6 which is approx. 18-25 mm. Bottomline: when you mount a 11-16 mm lens on your 7D, you will effectively get a focal length of 18-26 mm.
#35 Jul 29th, 2011, 12:13
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#35
Quote:
Originally Posted by dipsudipta View Post arindamdas: I couldnot understand. Is TOkina 11-16 is for Full frame camera focal length. If it is then with APS-C size camera it will be 11*1.6-16*1.6 equivalent focal length.
No it is for APS-C cameras only. And 11*1.6=17.6, 16*1.6=25.6. So I don't think Arindam has done a large error in calculation.

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#36 Jul 29th, 2011, 12:14
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#36
What about canon EF-S15-85mm f/3.5-5.6 IS USM? Is it good on EOS 7D for landscape photography?
#37 Jul 29th, 2011, 12:17
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#37
yes, that's a very good lens. but then, it does not go down to 2.8.

(thanks, biman, I'll give him 1 mm more on the long end :-))
#38 Jul 29th, 2011, 12:18
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#38
Quote:
Originally Posted by arindamdas View Post yeah, when you mount it on a full frame camera, it will behave like a 11-16 mm lens.
Sorry to contradict you. The lens (full name - Tokina AF 11-16mm f/2.8 AT-X Pro DX) is meant for APSC cameras only.
#39 Jul 29th, 2011, 12:20
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#39
aah ok, I thought dip meant that the lens is for full frame. I didn't check that, and I haven't used it either. My mistake, thanks for correcting it, biman.

but then, it still holds that when mounted on a 7D, the 11-16 mm DX lens will still have an effective focal length of 18-26 mm. It's just that the performance of the lens is optimized for a crop sensor camera, and many times, you won't even be able to mount crop sensor only lenses on a full frame camera.
#40 Jul 29th, 2011, 12:27
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#40
@dipsudipta: I will suggest you (considering your existing lens and your budget) to go for 10-22mm, as Arindam suggested initially. It has a good range from 16mm to 35-36mm. And although I don't have any practical experience (Arindam, can you help us in this regard?), I have doubts how far critical it would be to compare a f/3.5 lens with a f/2.8 (depth-of-field-wise) in sub 20mm range. Speed-wise I wouldn't have bothered for 1 to 1.5 stop if I had a camera like 7D, which I can shoot with at ISO 800 without being concerned for noise.
#41 Jul 29th, 2011, 12:28
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#41
OK. Then i will go for EF-S15-85mm f/3.5-5.6 IS USM. And what about EF70-200mm f/4L USM? Is it realy good without IS?
#42 Jul 29th, 2011, 12:30
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#42
And another question. What you people think of 7D? Is it good enough compare to nikon D7000 or inferior?
#43 Jul 29th, 2011, 12:31
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#43
a super wide angle is almost a specialty lens, which almost everybody acquires after he/she has had a walk around lens. A 17-50mm is certainly a walk around lens, and does landscapes very well. Personally, I haven't yet been handicapped by the lack of f/2.8 when shooting landscapes. If low light focusing is a problem, I switch to manual focusing. If you agree with me, I would recommend the Canon 15-85, it's a genuinely good lens.
#44 Jul 29th, 2011, 12:33
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#44
are you kidding me? is it good enough? you have a mighty fine camera, rest assured, the rest is up to you.

for 70-200 (effectively 112-320 mm), if your budget permits, I would suggest to get the IS version. stabilization becomes critical at large focal lengths. I don't know how old you are, but at my age, I couldn't do without the IS (when handholding).
#45 Jul 29th, 2011, 12:41
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#45
Actualy i know very much about 7D and that is why i bought it 3 yrs back. I was trying to know what your recommendation is? Now plz suggest one thing. What i will loose if i am not using a full frame (35mm). I know technical terms crop factor. What the hell is that? Except field of view is there anything else to say about it? If i loose field of view due to crop factor then i will use another lense to compensate equivalent field of view. What big deal is that?
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