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  1. #21
    Senior Member

    Re: How to lock focus on D3500?

    Nick,

    Thank you for your candid and admirable testimony on BBF. I hope I can enjoy using this technique too.

    Just another simple (for you) question: For stationary subject, after you press BB, do you release or hold it for recomposing? For moving subject, after pressing BB, to track I assume you would hold it and follow the subject until it's in view of your favorite. Then will you still hold or release to take a shot (press shutter)? Due to a lack of time and situation, I have to make imaginative experiments with only theory but no verification or confirmation. Please share and help.


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  2. #22
    Senior Member

    Re: How to lock focus on D3500?

    For a stationary subject, you must release the button when you recompose. Otherwise it will instantly refocus on whatever the focus point lands on after recomposing. Think about what I called it above: "Power assisted manual focus". You are in control but you have the motor and the camera's sensors to help you achieve a 'manual' type focus on the object of your choosing.
    For tracking, you can hold the button continuously. No need to release it, just click the shutter when ready. But you could release it if you wanted too. When I shoot macro, I usually hold the button down forever. The continuous focus keeps up with my wobbling. But sometimes, I take focus and release the button then I wait for my wobble to bring the bug into best focus and trip the shutter. I use it very much like I would use manual focus, but with some help from the camera.
    Thanks/Like blackstar Thanks/liked this post
     
    I must have a really good camera.

  3. #23
    Senior Member

    Re: How to lock focus on D3500?

    Thank you so much, Nick.

    That is exactly what's in my imaginary implementation. So verified and confirmed. Guess that while holding BB with the thumb, triggering shutter by index quickly and steadily would need a lot of practice and good hand though. Difficult my old, weak hand would say.

  4. #24
    Senior Member
    Bob Blaylock's Avatar

    Re: How to lock focus on D3500?

    How to lock focus on D3500?
    Quote Originally Posted by blackstar View Post
    Say I use MF or AF to focus a subject and I want to lock focus ring to that distance. Is there a simple way to lock focus from that point? (AE-L/AF-L is way too much for me to use, especially the button need to be pressed all the time. I need free fingers all the time after focus locked

    I wonder if I use MF to focus on a certain distance and then move the camera to other position, angle, or rotate, etc without touching the focus ring and zoom, what chance is that I would lose the previous focusing point?

    Appreciate all the answers and helps.
    When I want to do that with my D3200, using the lens that came with it, what I do after getting the lens to focus is, on the camera, to set the focus mode to manual, but leave the focus mode switch on the lens set to auto. This way, the lens stays locked where it is focused, only allowing itself to be changed by the camera, but the camera is set not to try to change it.

    I would assume that the same technique should work, just the same, on the D3500.

    Assuming the D3500 is the same as the D3200, as far as this is concerned, here's how to do it…

    First, push this button:

    How to lock focus on D3500?-2020-02-17_05.47.05n.jpg

    Next, select this menu item:

    How to lock focus on D3500?-2020-02-17_05.47.33n.jpg

    Then select MF.

    How to lock focus on D3500?-2020-02-17_05.47.50n.jpg

    The camera is now set to manual-focus mode. It will not attempt to autofocus, it will just take the picture, leaving the lens focused where it is.

    Leave this switch on the lens set to A, and it will effectively lock the lens where it's focused.

    How to lock focus on D3500?-2020-02-17_05.50.51n.jpg
    Last edited by Bob Blaylock; 02-17-2020 at 03:15 PM.
    Thanks/Like Needa Thanks/liked this post
     

  5. #25
    Senior Member

    Re: How to lock focus on D3500?

    Thanks, Bob.

    The kit lens (18-55mm) came with your D3200 is nice to have focus and VR switch on it. And the way you (suggest to) use to lock focus sounds straight and simple. Unfortunately, no either switch can be found on my two kit lenses with D3500.

    However, after reading your reply, I tried re-thinking this over and thought isn't it the simplest way to lock focus: Just use MF to focus an object at hyperfocal distance leaving focus ring and zoom ring untouched and turn to the night sky to shoot stars (at infinity). But this can work only if nothing (including camera itself, focus ring itself, moving camera position, etc.) would change or move focal point after HF distance is focused. Can anyone verify and confirm this? Thanks
    Last edited by blackstar; 02-17-2020 at 09:31 PM.

  6. #26
    Senior Member
    Challenge Team
    cwgrizz's Avatar

    Re: How to lock focus on D3500?

    Quote Originally Posted by blackstar View Post
    Thanks, Bob.

    The kit lens (18-55mm) came with your D3200 is nice to have focus and VR switch on it. And the way you (suggest to) use to lock focus sounds straight and simple. Unfortunately, no either switch can be found on my two kit lenses with D3500.

    However, after reading your reply, I tried re-thinking this over and thought isn't it the simplest way to lock focus: Just use MF to focus an object at hyperfocal distance leaving focus ring and zoom ring untouched and turn to the night sky to shoot stars (at infinity). But this can work only if nothing (including camera itself, focus ring itself, moving camera position, etc.) would change or move focal point after HF distance is focused. Can anyone verify and confirm this? Thanks
    That will work. Many use that method and even use a small piece of tape to hold the focus & zoom rings in place until after they take their shots. Set up in the daylight and fix it for your night shots. If you are shooting the stars, set your camera up for the hyperfocal length in the day time. Tape the rings. At night take your camera back out and shoot. Set your tripod up close to where you had it before. A few feet one way or another when shooting stars shouldn't make any difference.
    Thanks/Like blackstar Thanks/liked this post
     
    Walt

    D750; D7100; D5300;
    18-55mm f/3.5-5.6 G II VR; AF-S VR 70-300mm f/4.5-5.6 G IF-ED; AF-S 85mm f1.8; Tokina 11-16mm f2.8 (IF) DX II; 200-500mm f5.6E ED VR; AF-S VR 24-120mm f/4G ED; TC14E II



  7. #27
    Senior Member

    Re: How to lock focus on D3500?

    Thanks, Walt for confirmation.

    I kind of dislike using tape... Anyway, I plan to do the HF thing in the night and before the star shooting because I would probably want to shoot scenic photos even sunset before dusk during the camping trip. Hopefully, the locked HF point can stay intact while turning to the sky in a short span... BTW, I already acquired some night gears needed for night shooting (e.g., headlamp).

    Ok, now let's compare this basic MF method with BBF: MF needs real manual focus skill and BBF has an advantage of speed (fast automatic focus) but may lose on sharp edge? What's your verdict in line with your experience? Appreciate your input.

  8. #28
    Staff
    Super Mod
    hark's Avatar

    Re: How to lock focus on D3500?

    In one of your other threads, Moab Man gave you info on hyperfocal distance (your moon thread). If you have a smart phone, consider downloading the app Simple DoF. You can enter your camera model, the focal length of the lens being used, and the aperture. Then you can play around with the distance where you are focusing (how far into the scene you are placing your focus point). The app will give you the info on what's in focus. It also lists info on hyperfocal distance.
    Cindy
    Flickr
    and My 2020 Thread

    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci



  9. #29
    Senior Member

    Re: How to lock focus on D3500?

    Quote Originally Posted by blackstar View Post
    Ok, now let's compare this basic MF method with BBF: MF needs real manual focus skill and BBF has an advantage of speed (fast automatic focus) but may lose on sharp edge? What's your verdict in line with your experience? Appreciate your input.
    Nothing better or worse in my opinion. Depends on your eyes too. I'm getting older and need reading and distance glasses. Nothing terrible, but at any given time, I might have distance glasses on or reading glasses or no glasses. My viewfinder is tweaked for my eye with no glasses but I don't always want to remove my glasses. So I can't really trust that what I see through the viewfinder is perfectly manual focused. I have to look at the camera's focus confirmation anyway. With bbf, I can take my focus anywhere I put the single point and then recompose. I don't have to trust my eyes or glance to the focus confirmation. Back in the films days, I had a split prism focus screen so it was much easier to manual focus. I had better eyes back then too.
    I must have a really good camera.

  10. #30
    Senior Member

    Re: How to lock focus on D3500?

    Thanks, Cindy. I already have PhotoPills for HF and other info.

    Thanks, Nick. You may have the point on BBF over MF for "glasses wearers"! I myself wear glasses too and always feel it a troublesome burden when shooting (especially focusing) with a camera. My viewfinder is adjusted with my distance (progressive) glasses though as I usually wear distance glasses all the time (except sleeping) during a trip. At home, it's reading-computer glasses, distance glasses, or no glasses at any instant. So I may take that use BBF for most situations if I can get used to it comfortably and naturally.





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