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smc takumar question Anonymous
i want to get a smc takumar 50mm 1.4 but i have 2 questions

1- will it meter on a canon 400d? it's not a huge deal because i could take a shot and adjust but it would be nice

2- how does the aperture work? with my original canon lenses, they're wide open all the time and only close down for the duration of the exposure. do i simply select the aperture i want on the lens physically and it works fine?

thanks dudes
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>> Anonymous
1. Yeah, meters just fine. Unlike Nikons, Canon's don't give a damn about what lens is on your camera, they just pay attention to the light coming in and figure out your metering based on that.

2. Stop-down metering. So when you turn the knob to change your aperture, the viewfinder will get darker and your depth of field will appear wider (at least once you get past f/2.5 or so).
2a: Aperture priority will work fine, though you'll be changing the aperture on the lens rather than with the control wheel
2b: Program/Auto will work like Aperture Priority, I believe
2b: Shutter priority will act like full manual
2c: Full manual will act like your mom

It's actually a really good idea if you like shooting in full manual mode, because you're basically taking the 400D's one control wheel and giving it a second one. Aperture on the lens, shutter speed on the dial. The caveat, of course, being that you have to manually focus everything (so make sure you get a chipped adapter so your focus confirmation lights work. They're about twice the price of non-chipped adapters, but that's still only like $30) and have to deal with a dim viewfinder if you don't want to shoot wide open, but I'd say those are small prices to pay for a digital camera that handles like an old-school manual focus workhorse. If I were still using my 400D, I'd totally do this.
>> Anonymous
OP here

about the metering, how does the camera body know what aperture i'm at though? wouldn't it just say f/00?
>> Anonymous
oh wait, the camera doesn't give a crap about the f/ number but when i stop it down, there's less light in and it will meter off that and still give me a shutter speed?

have i got it right or am i bonkers
>> Anonymous
>>221123
yes
>> Anonymous
okay, last followup question

about the aperture not being controlled by the camera

so i want to shoot at f/4:

i turn the aperture ring to f/4, the blades close down and my viewfinder is darker but my meter reads off the light receives and gives me a certain shutter speed

let's say 1/50, now please don't take my head off because i don't know how exactly it works

but on my normal canon lenses, the blades are open then close up real fast during that 1/50 and open again, with this manual lens, it will stay closed at f/4 during the whole 1/50, will my entire frame be exposed properly?

sorry if it's a dumb question :f
>> Anonymous
>>221129
yes, your frame will be exposed correctly.

>then close up real fast during that 1/50 and open again
wrong. the blades narrow the aperture to the desired value, THEN shutter opens for 1/50s, shutter closes, THEN the blades open again.
>> Anonymous
>>221133

oh i see, i thought the they progressively close down during the 1/50 and also close back up within that time

thanks man