New answers tagged autofocus
1
The 5DIII is great for photography. The improvements in the 5D generations for photography are mostly in high iso, homogeneity in noise and definition. It has 3 AF in video: quick (through optical viewfinder and classical AF), AF (you put the zone and ask for focus), and AF with face tracking. It's OK but far from the dual pixel AF you get in 5DIV, Canon R ...
1
Back Button focus?
As silly as it sounds, I have enabled/disabled it before and forgotten which way the camera was set up...
0
It sounds like it is broke. Take it or send it to someone that knows how to fix it.
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My lens works for a few shots in auto-focus and wont be able to focus again; even when i turn the camera on and off.... when i click all i hear is a lens struggling to get a focus and thats it.... it never auto-focuses
1
The Nikon focus points map like this. What that means in terms of image pixel size IDK... a lot more than 1.
FWIW, this is nothing like how the AF sensor/sensor lines actually look/work.
The exif for a D850 image reads like this:
AF Area Mode : Group Area
Phase Detect AF : On (153-point)
AF Points Used : E12
Primary AF Point : C12
Which means: Group ...
0
Cheap option. Attach the flashlight to a stand or your camera and shoot. The speedlights will overpower the flashlight anyway so it won't be visible in your photo unless you are shooting at very low power.
Point being that you don't have to worry about turning the flashlight off before you shoot, just ignore it and shoot anyway.
4
Many camera mounted speedlights and controllers have near-infrared AF assist lamps. They illuminate briefly when the shutter is half pressed and go out once focus is confirmed. Such AF assist lights require communication between the camera and transmitter (or flash) that use the proprietary pins for each brand that surround the standard center pin on the hot ...
2
So you could hit a button to turn on the light, get your focus, hit another button to turn off the light, then take the shot?
Using a studio strobe, you typically have a modeling lamp. You don’t have to turn off the modeling light to shoot. They’re enough light for you to get an idea of the lighting and focus. But the strobe flash will greatly overpower the ...
-1
If this problem isn't in other Nikon models and the warning wasn't in big red highlighted writing then I think a Judge might rule in your favour.
The small claims court would certainly be worth considering.
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I'm on my 4th Sigma 18-250 mm lens I have had the same autofocussing issue with 3 of them. The Sigma warranty is only for a year and it takes more than a year for the problem to develop. Lubrication seems to be a likely answer from dood above and having taken my first lens apart, I would not recommend a DIY approach. I sent one lens back to Sigma but it cost ...
3
Two things that make the question moot:
Your EOS Rebel XTi/400D is only rated to autofocus with lenses f/5.6 or wider (lower f-number). There are third party lenses with f/6.3 maximum apertures at the longest focal lengths that still autofocus on Canon f/5.6 limited cameras. Many have theorized that either the third party lens "tricks" the camera into ...
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You are going to use manual focus, because on these cameras the AF is not functional past f/6.3 (which is why the big 150-600m zooms from Tamron/Sigma are f/6.3 at the long end). Still true on my 70D which is several generations younger and one market band higher.
With a 1000mm lens your depth-of-field is quite shallow. On this online computer:
Subject ...
5
With a Canon Rebel XTi and a 500mm - 1000mm f/8 lens, the question isn't really, Should I use Autofocus or Manual Focus but more so Will Autofocus Work At All?
The Rebel series is a consumer grade series - it was never designed for tracking birds in flight, for example.
You've got 9 focus points and, for the life of me, I can't remember or find in the ...
1
For birds at rest, you can probably get away with manual focus. For birds in motion/flight, you would have to be very good with your manual focus to be successful. Autofocus would have a much better chance in that case, and preferably one of the tracking autofocus modes if your camera has it (e.g. Canon's AI Servo mode or the equivalent for whatever ...
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