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    richarddevlin
    28 Apr 2012 - 1:04 PM

    I have a canon L 70-200 f4 is and also a sigma 120-400 f5.6 which I use on a Canon 5d mk2 and a 7d ,Im thinking about selling the sigma and buying a mk2 2x canon extender to cover the loss of the sigma ,space is a issue and obviously I would gain some space but will I lose quality . I d be grateful for some advice.

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    GarethRobinson
    GarethRobinson e2 Member 8979 forum postsGarethRobinson vcard United Kingdom2 Constructive Critique Points
    28 Apr 2012 - 2:19 PM

    I would think the 70-200mm f4 with a 1.4 or what ever it is canon offer would be fine. A 2x is not going to be good and your af will suffer.

    Also consider what you can get for the 70-200mm and 120-400mm if you sold it and see if that would get you a 2.8 lens and have a look at 3rd party lenses some are as good and better than what canon offers. do some research off course.

    Last Modified By GarethRobinson at 28 Apr 2012 - 2:36 PM
    george-dan
    28 Apr 2012 - 2:25 PM

    the canon 70/200 f/4 L IS will be ok with the 1.4 extender , they seem good on mine. i would not bother with the 2x though you will be pushing to much .

    ianrobinson
    ianrobinson e2 Member 41107 forum postsianrobinson vcard United Kingdom8 Constructive Critique Points
    28 Apr 2012 - 2:32 PM

    I would be selling both lenses and getting a sigma 120-300mm f2.8 lens then buying a 2x converter for that so you get a reach of 600mm focal length with very minor loss of IQ if any at all, you also retain auto focus and all the functions you did without converters..

    You have a problem in the way you are thinking, let me explain, buying a 2x converter for you 70-200mm f4 will result in loss of auto focus and a definite loss of IQ, IQ will be lost through lack of light getting into your lens.
    Also by selling your sigma you are not gaining anything really.

    I only use converters on any lens with f2.8 ensuring i don't go over f5.6 which in lenses is the magic figure, anything above this figure with converters on results in loss of auto focus and serious lack of light getting in and on to your sensor resulting in soft images and poor IQ.

    Hope this helps.

    Last Modified By ianrobinson at 28 Apr 2012 - 2:34 PM
    george-dan
    28 Apr 2012 - 2:36 PM

    i don't think he will even have auto focus on those cameras , i think it only works on 1d cameras.

    GarethRobinson
    GarethRobinson e2 Member 8979 forum postsGarethRobinson vcard United Kingdom2 Constructive Critique Points
    28 Apr 2012 - 2:40 PM

    If you go the route Ian is saying make sure you buy a sigma tc. I use the 120-300mm 2.8 and have both sigma 1.4 and 2x tc's. I can't complain about image quality.

    Last Modified By GarethRobinson at 28 Apr 2012 - 2:40 PM
    richarddevlin
    28 Apr 2012 - 5:24 PM

    Thats all very well but I m then turning it from a swap without any real outlay into a swap + 1000ish?? or am I missing something.

    george-dan
    28 Apr 2012 - 5:44 PM

    just go for a canon 100/400 or a canon 28/300 Wink

    justin c
    justin c  104519 forum posts England36 Constructive Critique Points
    28 Apr 2012 - 6:02 PM


    Quote: space is a issue and obviously I would gain some space but will I lose quality . I d be grateful for some advice.

    Yes, you will lose some quality and as stated above, you will also lose auto focus. As you already own a lens with a focal length of 400mm at f5.6, why would you want to swap that for 400mm @f8 (i.e. the 70-200mm with 2X extender).

    Last Modified By justin c at 28 Apr 2012 - 6:06 PM
    richarddevlin
    28 Apr 2012 - 10:13 PM

    I don t want to lose quality the question was would I ? the answer would appear to be yes ,I was trying to get the same focal length from one lens that I already have with a extender to save space the answer was never gonna be spend 1800 on another lens.

    Overread
    Overread  63746 forum posts England18 Constructive Critique Points
    29 Apr 2012 - 12:33 AM

    Personally I would suggest considering a Canon 70-200mm f2.8 IS L MII

    Yes I know that means a larger investment to replace the two lenses you've sold, however what you get is:

    1) A stella 70-200mm f2.8 IS L lens to replace your f4 version. Sharpness should be somewhat improved and you gain up to f2.8 in aperture; improving lowlight performance and also allowing for a little more variety with aperture (depth of field) selection.
    You lose out on the fact that the f2.8 version is heavier than the f4; however the f2.8 70-200mm is what I would consider a reasonable weight and size that the average person; with some time; will grow accustomed to using it. (this is as opposed to the above suggested 120-300mm f2.8 which is a much bigger and much heavier lens).

    2) A 140-400mm lens with the 2*TC attached (MII or MIII versions of the TC). This might actually improve the quality over the 120-400mm a little, though like the zoom, this setup will show a marked improvement at around f7.1-f8 - however wide open at f5.6 (the maximum aperture after taking into account the 2 stops loss of light from adding the 2*(TC) should still deliver usable results .

    LenShepherd
    LenShepherd e2 Member 62460 forum postsLenShepherd vcard United Kingdom
    29 Apr 2012 - 7:13 AM


    Quote: but will I lose quality

    Compared to using a longer focal length quality lens - using extenders looses quality.
    With the best long lenses the starting quality is usually so high that you can still get good quality using extenders.

    richarddevlin
    29 Apr 2012 - 8:32 AM

    So overhead what your saying is that a with a f2.8IS I might get away with it but not with a f4 IS....with 2nd hand prices at the moment I could sell both lens for 1000-1100ish which is about the price of a 2nd hand f2.8IS and then get a extender 2nd hand for 260ish 2nd hand. Does this sound reasonable?

    george-dan
    29 Apr 2012 - 9:03 AM

    i used to own the canon 70/200 l is mk1 it was crap at the 200 end even worse with the 1.4 extender on i would not of even tried with the 2x . i sold it and kept the non is one i had .the new mkII is a lot better ,but a lot more money, just go for the 100/400 l is . see test for the 70/200 l is here

    Johno450
    Johno450  3 United Kingdom1 Constructive Critique Points
    28 Oct 2012 - 5:52 AM


    Quote: Personally I would suggest considering a Canon 70-200mm f2.8 IS L MII

    If you can afford it I would go with the above... I have used both converters on this lens... the combo gives you a lot of flexibility...

    John.

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