Sorry to bother you with another ''comparison'', but i have a few questions regarding these lenses
At the moment i have the 500 f4 IS and 1.4 converter , but have a chance to sell it and get the 300 f2.8 IS II for the same price.
Some concerns i have are :
The 500 f4 is a little bit heavy ( even tho i have no problems handholding it for several hours when walking around looking for birds), It has 2 stops IS , and utilizes only 1 cross type sensor on my 1dmkiv , with or without the converter.
The 300 f2.8 IS II with 1.4 converter is quite a bit shorter than the 500(420vs500, means 41.7% more pixels on target with the 500mm lens), but it looks to be sharper center and mid frame than the bare 500 @ f4
Also, it can use all 39 cross type sensors on my 1dmkiv , so the autofocus accuracy should be a little bit better when tracking? ( The speed is probably too close to tell ), also it has 4 stops of IS which combined with the lower weight and smaller size should make it easier to keep my focus point on target and maybe resulting in more 'keepers'
The 500 with 1.4 converter and the 300 with 2xIII converter, the 500 will have 36%more pixels on target and probably slightly faster AF, IQ seems to be on par, with maybe a slight edge to the 300 f2.8
At 910mm equivalent i am having a pretty hard time getting a high keeper rate when shooting BIF handheld, the trade off in weight and better IS vs less auto focus speed and maybe slight loss in IQ could be worth it if the keeper rates vastly improves.
Main goal is for safaris , it's hard to judge what focal length is ideal, a 500 can be great if you need to keep your distance when following cheetahs on a hunt, but when following dogs on a hunt it becomes useless (Atleast i cannot keep 650mm equivalent on target when sitting in a car going 40ish km/h) , Birds are everywhere and most of the time too far or too small, so having a lot of FL can help
Although I seem to be a bit focal length obsessed , in 10 years all the safari picture i have will be indistinguishable for i only have ''headshots'' and not enough pictures of animals in their surroundings.
You never know what you will see , it comes down to luck most of the time...(having a good guide and tracker can help), the only guarantee are birds hehe
Is there anyone that has experience with the 1mkiv comparing 1cross type vs 39? ( most of the time I like to use only the center point(with expansion sometimes) , and just when i completely lost the target use the normal focus to re aquire, normal focus set to af-on, center point to *
Other than the digital picture crops, any people who have used the old 500 and new 300 that can quantify some of the things on paper? ( AF speed, the difference when looking in the viewfinder )
A 650d or potentially 7d/7dmk2 will be the second body i will use, with the 70-200 (112-320 equivalent)
With the option to use 1.4/2 converters on the lenses and switch bodies between them