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R8 + (-6.5 EV Acquisition) + Odins + DXO PL6 + F4L Lenses

Started 1 month ago | Discussions thread
Higgins2002
Higgins2002 Contributing Member • Posts: 913
Re: R8 + (-6.5 EV Acquisition) + Odins + DXO PL6 + F4L Lenses
1

John Sheehy wrote:

Higgins2002 wrote:

John Sheehy wrote:

Higgins2002 wrote:

For low light birding your worst enemy is high iso with f8 och f11 lenses not the ability to focus or not

That depends on the alternative optics, No? From the same distance, 400/5.6 will give the same basic subject noise as 800/11, but the 400 will have better light for low-light AF. If it's 800/11 vs 800/5.6, however, that is a totally different bag of beans; f/11 will give far more noise and weaker AF ability.

The Question has been forgotten?

The Q was if the R8 is good for low light birding with F8/f11 lenses AF wise !!

My answer was It sure can focus but High ISO is your enemy with F8/F11 lenses.

It does not depend on any other options at all !! F8/11 lenses almost allways have this problem in low light with sort of forced SS for freezing the object

Heavily-cropped shorter, faster lenses have the same problem with noise. My point seemed to go over your head. For any given subject in any given lighting, the size of your pupil during exposure and its distance from the subject are going to determine basic subject noise; not the f-ratio. There is no damage to your subject by using ISO 12,800 at 800mm than using ISO 3200 with 400mm and cropping. The only real problem with the high f-ratios with large-enough pupils is AF speed, especially in low or flat light or when there is little subject contrast.

A lot of people make the same error that you are making here, and I don't understand it. AF is clearly affected in marginal conditions by f-ratios; noise is only greater with a smaller pupil, if that slow lens allows you to crop less.

It's the same thing when deciding to add a TC in a focal-length-limited situation; I never refrain from adding it because of noise; that is wrong and absurd. I refrain because either the angle of view will be too narrow to work with, or, there will be loss of AF spontaneity or subject stickiness.

I don't know why I have to say again what I said in the post of mine that you replied to, but here it is again; if you are using an 800/11 in lieu of an 800/5.6, then you lose low-light AF ability and you get a lot more noise. If you use an 800/11 in lieu of a 400/5.6 with heavier cropping, however, you get no more subject noise, possibly a small amount less due to non-invariance, but you do lose some AF ability, especially in poor light.

Never said 800 vs 400 and cropping ....you made that statement not me , I only stated if your lens has F8 or F11 that is harder than 2.8/F4 lenses of course at same focal length .

For me  f8 and F11 lenses they give me ridicolous high isos in my kind of low light and 25600 or 51200 looks like sh*t ( with a 400/500/600/f4 I would end up with iso 6400 instead of 25600 with an F8 lens and that is dramatically better IQ when in bad light)

Low light for you maybe good light for me and when in good light there is no problem.

Low light birding what is it to you? .....1/1000,  iso 12800?  or like 1/200, iso 25600?

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Canon EOS R5 Canon EOS R7 Canon RF 35mm F1.8 IS STM Macro Canon RF 24-105mm F4L IS USM Canon RF 100-500mm F4.5-7.1L IS USM +2 more
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