wang_erwin

<p><a href="../photodb/user?user_id=3688373">Arie Vandervelden</a> , Nov 05, 2010; 12:42 p.m.</p>

<p>I wish my camera had 5 autofocus points. 1 at each 1/3rds and one in the middle.</p>

<p>quite agree!all cross type points</p>

<p>David, I was talking about low light sport or stage shooting,and considering richard here is using 50D of which extreme ISO i/o image quality is around 1600 in my understanding ;)<br>

BTW,yr 1/500 theory is good advice</p>

<p>Marc,good job!</p>

<p ><a name="00XGvv"></a><a href="../photodb/user?user_id=1841065">JDM von Weinberg</a> <a href="../member-status-icons"><img title="Subscriber" src="../v3graphics/member-status-icons/sub5.gif" alt="" /><img title="Frequent poster" src="../v3graphics/member-status-icons/3rolls.gif" alt="" /></a>, Sep 12, 2010; 02:58 p.m.</p>

<blockquote>

<p>Wow ! that is allot of money to pay for a f4.5/5.6 lens !</p>

<p> </p>

</blockquote>

<p>True enough, but <strong><em>for the top-end focal lengths in question</em></strong>, and with IS on it, these are not exactly "slow" lenses either. There aren't a lot of 300mm f/1.4 lenses out there. :)</p>

<p> </p>

<p>well,IS dont means faster shutter speed in low light ；）</p>

<p>it relates light condition u are going to shot.<br>

F4 will be no question to enjoy more sharp C-C image F4IS brings in bright daylight.<br>

In low light condition when pushing ISO to the extreme,sometimes one stop means bluring away.(1/100 upto 1/200).But I recommend 135L here to claim another stop faster/better image quality/fast focusing out of 70200 2.8<br>

another details should be noticed is,F4 IS have much better image quality between 135-200mm,also it's optimized for shooting tele subjects comparing 2.8 ones.IS is another superiority for tele photography.<br>

the down side is,EOS DSLRs need F2.8 wide open to function cross type focusing point,that means F4 IS could be focusing somehow shilly-shally in low light/low contrast situations.<br>

All in all,F4 IS is a better choice in general situations.While 135L or wallet scratching 200 F2IS is to be considered if u shoot in lowlight in most cases</p>

<p>2470 is nice choice for general purpose photographying include wedding shootings.<br>

but a prime will get u just the 10% pics will never been forgotten.<br>

In low light situation? shooting with fifty is always a joy.Flash only to be used to balance exposure,but never count on it to raise shutter speed</p>

<p>according to the pic attached,seems the blur is caused by hand shake but not fast movment,b/c the girls are not in fast movement at all,and all blurs are going w/t orderliness.<br>

Yet anyway 1/30 shutter speed is far from sport shoting.<br>

Or we can say,the sample does not show joseph's difficulty evidently.<br>

we here need at least 2stops improvement,<br>

either new glass or body is needed.better both if wallet allows<br>

monopod helps more than tripod in tele action shootings-if u can not afford those hell expensive cradle sets</p>

<p>MF driving a fast prime on DSLR is definitely the one last choice even with any focus screen equiped.<br>

LV could be makeup in some degree<br>

50 1.2 auto focuses nicely on my 5D and 5D mk2,at least nicer than MF.<br>

In case MF is a habit, go get a leica</p>

<p ><a name="00XFyN"></a><a href="../photodb/user?user_id=20739">Ken Schwarz</a> <a href="../member-status-icons"><img title="Subscriber" src="../v3graphics/member-status-icons/sub10plus.gif" alt="" /></a>, Sep 10, 2010; 07:59 a.m.</p>

<p>I strongly recommend the 70-200 f/4 IS over the plain f/4. IS works wonders with a tele zoom and makes it much more practical as a hand-held lens. To pay for it, I'd skip the 50/1.4 or the 85/1.8, depending on your taste.</p>

<p>fully agree<br>

the IS version is not simply adding IS to plain version.all optical performance improved to high level.<br>

a fifty is always needed.So just forget about the 85</p>

<p>believe yr best choice to be 5D MK2 or dual 5D if can got any fine pieces fm second hand.<br>

Apsc format will deeply effect yr sensation to lenses built on full format, also believe me it is not a better choice to try...<br>

one exception is if you are in eager demand of 720P 60FPS video shooting ,u'll need a 7D</p>

<p>believe yr best choice to be 5D MK2 or dual 5D if can got any fine pieces fm second hand.<br>

Apsc format will deeply effect yr sensation to lenses built on full format, also believe me it is not a better choice to try...<br>

one exception is if you are in eager demand of 720P 60FPS video shooting ,u'll need a 7D</p>