long exposure noise reduction in time mode

[ClaudioG]

Hi, sorry, this may be a daft question. But, if i take a let's say 4 min exposure and put long exposure .nr on. It will effectively take 8 min. But, if I'm using a remote, how many times do i need to press the remote? Once to start, again at 4min? And then on again for another 4 min? Or does the camera apply the other 4 min on its own? I'm just confused as to how all this works with a remote to trigger the shutter when long exposure noise reduction is on.

[Mike Buckley]

You'll probably get more definitive help if you provide the camera manufacturer and model.

[Stagecoach]

Hi Claudio,

I can tell you exactly what a D300 does.

With High ISO NR switched on and a remote push button release connected with the camera in 'Bulb'

a) On depressing the remote and keeping pressed the shutter remains open until the remote is released.

b) After the remote is released (I did 45 sec) the camera continues with the second exposure and flashes 'Job run' in the top LCD panel for 45 seconds and then stops.

So only one single press and release after the exposure time required was necessary with mine.

Grahame

[AB26]

Hi Claudio,
Long Exposure NR can be applied to exposures of 8s and longer. NR is processed in camera and the exposure time will increase by 50-100%. You need not do anything but set Long exposure NR and press the release button on the remote, the camera will do the rest.
If you intend using Bulb mode things might get a little tricky.

[William W]

"long exposure noise reduction in time mode"

. . . .if i take a let's say 4 min exposure and put long exposure .nr on. It will effectively take 8 min. But, if I'm using a remote, how many times do i need to press the remote? Once to start, again at 4min? And then on again for another 4 min? Or does the camera apply the other 4 min on its own?

IF there is a TIME Mode (T Mode) available on the camera then you wil need to press the remote shutter release at the beginning of the exposure and then again at the end of the 4 minutes.

But I think it is more likely that it is B Mode (BULB), in which case the remote release needs to stay depressed for 4 minutes and then released.

In either case the camera will contiue the process of NR and you do not need to activate the shutter release again, for that NR to happen.

The availablity and functionality of Long Exposure NR diffrers between cameras, but all DSLRs operate in the same manner aprops the B Mode and the shutter release (otherwise it would NOT be labelled "B Mode") and I don't think there are any DSLR's with a T Mode available.


WW

[ClaudioG]

Sorry should've stated I'm using a nikon d5100. So set release mode to delayed remote. Which gives me time option instead bulb so i don't need to hold button down throughout. So if I'm understanding every1 correctly i can trigger remote, then as example 4 minutes later press remote again, and then the camera should apply long exposure noise reduction it's self. If i set it to on of coarse?

[ClaudioG]

Just tried it out guys, all spot on. Thank you for all the help! Time mode activates when you set release mode to delayed remote. Ty all

[Stagecoach]

Claudio,

That appears correct if you are using the infara red Nikon ML-L3 remote, if using the MC-DC2 remote cord then it looks as if the 'bulb' setting is used. Page 66 of the manual explains the two methods.

Grahame

[William W]

. . . I'm using a nikon d5100. So set release mode to delayed remote. Which gives me time option instead bulb . . .

I didn't know that option existed. Thanks.

WW

[Manfred M]

Claudio - if your camera works like my two Nikons (D90 and D800) the maximum exposure will be 30sec without having to use an external timer (or manually) in bulb mode.

The way that this noise reduction works is that sensor noise is dependent on the how hot the sensor gets, so the camera does two cycles; one for the exposure and one with the shutter closed and then it subtracts the "image" with the closed shutter from the original capture, hence the doubling of the exposure. I have not explored things enough to tell you what happens once the camera's internal timer is not used.

[Nancy Moran G]

What does NR do? Would I notice it if I took 2 photos, 1 with and 1 without it on?
And how long of an exposure should you put it on?
Thanks,
Nancy

[ClaudioG]

Claudio - if your camera works like my two Nikons (D90 and D800) the maximum exposure will be 30sec without having to use an external timer (or manually) in bulb mode.

The way that this noise reduction works is that sensor noise is dependent on the how hot the sensor gets, so the camera does two cycles; one for the exposure and one with the shutter closed and then it subtracts the "image" with the closed shutter from the original capture, hence the doubling of the exposure. I have not explored things enough to tell you what happens once the camera's internal timer is not used.

Hi Manfred , I'm only asking this is because i tried some long exp last night and i found when it got to over 4 min it left alot of white little dots throughout the image. I'm guessing these could be hot spots. I read up a little and hope that by setting long exp noise reduction on, it might help solve this problem. Will keep all posted a little later.

[ClaudioG]

What does NR do? Would I notice it if I took 2 photos, 1 with and 1 without it on?
And how long of an exposure should you put it on?
Thanks,
Nancy

Hi Nancy, I'm not sure about all this, the only reason I'm trying this out is from an experience of to many white dots in my images last night. Im hoping these are hot spots which long exp nr might get rid of. I know this is usually helpful for long exposures in the evening.

[Manfred M]

Hi Manfred , I'm only asking this is because i tried some long exp last night and i found when it got to over 4 min it left alot of white little dots throughout the image. I'm guessing these could be hot spots. I read up a little and hope that by setting long exp noise reduction on, it might help solve this problem. Will keep all posted a little later.

They are sensor hot spots for sure. Also easy (but tedious) to clean them up with the spot healing tool.