Hand Held Bracketing Script

HHBS.lua

--[[ 	
    HHBS
    Hand Held Bracketing Script for WA lenses
    Version 1.365
    Garry George Oct 2019
    http://photography.grayheron.net/
--]]																							


CON = "ON"
COFF = "OFF"
run = false
switched_off = false
min_tv = 0
base_tv = camera.shutter.apex
delay = 0
timer = 0
ev_lift = 0
choices0 = {COFF,CON}
choices1 = {"Float","800","1600","3200"}
AB_running = false
end_count = 0
half_press_dalay = 3000
ab_m = {}
last_key = 0

require("config")

function run_script(m)

    if AB_running and (not switched_off) then 
        if dryos.shooting_card.file_number == end_count then -- switch off AB and reset AB settings
            AB_running = false
            menu.set("Shoot","Advanced Bracket",0)
            menu.set("Advanced Bracket","Bracket type",ab_m[1])
            menu.set("Advanced Bracket","Frames",ab_m[2])
            menu.set("Advanced Bracket","Sequence",ab_m[3])
            menu.set("Advanced Bracket","2-second delay",ab_m[4])
            menu.set("Advanced Bracket","ISO shifting",ab_m[5])
            menu.set("Advanced Bracket","EV increment",ab_m[6])
        end
    end

    if switched_off then return true end

    if run then 
        base_tv = camera.shutter.apex
        sleep(delay)
        run = false
        min_tv = (menu.get("Auto ETTR","Slowest shutter",0) - 56.0)/8.0     
        
        -- set up advanced bracketing for HHBS. Note the script switches AB off after bracketing

        ab_m[1] = menu.get("Advanced Bracket","Bracket type",0)
        ab_m[2] = menu.get("Advanced Bracket","Frames",2)
        ab_m[3] = menu.get("Advanced Bracket","Sequence",2)
        ab_m[4] = menu.get("Advanced Bracket","2-second delay",0)
        ab_m[5] = menu.get("Advanced Bracket","ISO shifting",1)
        ab_m[6] = menu.get("Advanced Bracket","EV increment",1)

        menu.set("Advanced Bracket","Bracket type",0)
        menu.set("Advanced Bracket","Frames",2)
        menu.set("Advanced Bracket","Sequence",2)
        menu.set("Advanced Bracket","2-second delay",0)
        menu.set("Advanced Bracket","ISO shifting",1)

        local del = 0

        if Script_Menu.submenu["ISO logic?"].value == "800" then 
            if camera.iso.apex < 8 then
                del = math.floor(8 - camera.iso.apex + 0.5)
            end
        elseif Script_Menu.submenu["ISO logic?"].value == "1600" then 
            if camera.iso.apex < 9 then
                del = math.floor(9 - camera.iso.apex + 0.5)
            end
        elseif Script_Menu.submenu["ISO logic?"].value == "3200" then 
            if camera.iso.apex < 10 then
                del = math.floor(10 - camera.iso.apex + 0.5)
            end
        else -- float the ISO from the (ETTR) base ISO, irrespective of final value
            del = ev_lift
        end
        menu.set("Advanced Bracket","EV increment",del)

        end_count = dryos.shooting_card.file_number
        AB_running = true
        if base_tv > min_tv then
            menu.set("Shoot","Advanced Bracket",0)
            camera.shoot() 
            camera.shutter.apex = min_tv
            menu.set("Shoot","Advanced Bracket",1)
            menu.set("Advanced Bracket","ISO shifting",1)
            camera.shoot()
            end_count = end_count + 3
        else
            camera.shutter.apex = min_tv
            menu.set("Shoot","Advanced Bracket",1)
            menu.set("Advanced Bracket","ISO shifting",1)
            camera.shoot()
            end_count = end_count + 2
        end
    else
        return true
    end
end

function testkeys(kk)
    run = false
    if switched_off then return true end
    if kk == 1 then timer = dryos.ms_clock end
    if (kk == 2 and last_key == 1) and ((dryos.ms_clock - timer) > half_press_dalay) then run = true end
    last_key = kk
    return true
end

Script_Menu = menu.new
{
    parent = "Shoot",
    name = "HHBS",
    help = "Does what it says",
    submenu =
    {
        {
            name = "ON or Off?",
            help = "Switches the script on & off",
            choices = choices0,
            update = function(this)
                if this.value == "ON" then 
                    switched_off = false 
                    menu.set("Focus","Toggle SGFB",1)
                else 
                    switched_off = true 
                    menu.set("Focus","Toggle SGFB",0)
                end
            end,
        },
        {
            name = "Delay",
            help = "Shutter delay in seconds",
            min = 0,
            max = 5,
            value = 1,
            update = function(this)
                delay = this.value
            end,
        },
        {
            name = "ISO logic?",
            help = "Helps manages max ISO sensitivities",
            help2 = "Float uses ISO Ev lift from the base ISO",
            choices = choices1,
        },
        {
            name = "ISO Ev lift",
            help = "Lift above base ISO",
            min = 3,
            max = 5,
            value = 4,
            update = function(this)
                ev_lift = this.value
            end,
        },
        {
            name = "Half Press delay",
            help = "In seconds",
            min = 1,
            max = 9,
            value = 3,
            update = function(this)
                half_press_dalay = this.value * 1000
            end,
        },
    }
}

event.shoot_task = run_script

event.keypress = testkeys

config.create_from_menu(Script_Menu) -- keep track of the script's menu state at camera close