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Astrophotography and Sketching >> Beginning and Intermediate Imaging

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sullij1
Carpal Tunnel


Reged: 11/08/08

Re: Been trying to avoid asking this but..... new [Re: sullij1]
      #5921616 - 06/15/13 02:09 AM

YOU SAID THIS Now for example I took night sky exposures at 30 sec, ISO 3200, F3.5 with the camera set to 30 second exposures.

I just noticed the ISO 3200 is way too high! Back the ISO off to between 800 and 1600 and try again. I like the way ISO 800 worked for me. Stack and adjust levels and histogram to 1/3 and you should be good to go.

Clear skies.


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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: sullij1]
      #5923365 - 06/16/13 08:27 AM

OK just had the 1st chance all week to test it out. 2 shots 30 sec, one in bulb that I times for 29.8 sec (my bad) and one with the camera set for 30 sec, ISO 3200, F3.5 @18mm.

What I found was that in the data was that when I have the camera set for 30 sec the data reads ISO-280 NOT 3200 like I have it set in the camera. Now when I shoot BULB it uses exactly what I had set thus, it was overexposed due to the high ISO.

So now my problem is why even though my camera is set to manual does it use its own ISO when set to timed exposures? Wow, that blows me away because I normally don't look at the data and I thought I have been shooting in 3200 when I haven't been.....well that's frustrating hah.


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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: AstroDan77]
      #5923368 - 06/16/13 08:29 AM

Tonight when I go back out I'm going to shoot the same settings in BULB with ISO at 280 and theoretically it should look the same as the internally timed photo.

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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: AstroDan77]
      #5923378 - 06/16/13 08:35 AM Attachment (6 downloads)

Here's the 30 sec with internal timer.
ISO-280 though its set for 3200
f3.5
18mm

Edited by AstroDan77 (06/16/13 08:35 AM)


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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: AstroDan77]
      #5923380 - 06/16/13 08:36 AM Attachment (2 downloads)

Same settings in bulb mode but it actually used the ISO-3200 as I have it set.

Edited by AstroDan77 (06/16/13 08:37 AM)


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frito
Pooh-Bah


Reged: 10/05/12

Loc: Fremont, CA
Re: Been trying to avoid asking this but..... new [Re: AstroDan77]
      #5923728 - 06/16/13 12:46 PM

looks like its got some sort of auto adjust mode kicking in or something, what its choosing to do looks more accurate to what you are taking a picture of at least.

as for AP uses i would just get a usb and serial shutter cable and use BYEOS. it will bypass whatever it is your camera is doing automatically in manual mode and all will be well.


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sullij1
Carpal Tunnel


Reged: 11/08/08

Re: Been trying to avoid asking this but..... new [Re: frito]
      #5923774 - 06/16/13 01:18 PM

Agree on BYEOS.

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zerro1
Postmaster
*****

Reged: 08/02/09

Loc: Smokey Point , 48.12°N 122.25...
Re: Been trying to avoid asking this but..... new [Re: sullij1]
      #5923797 - 06/16/13 01:36 PM

the settings in M(manual Mode) are global> meaning: no matter what the f/stop, or ISO setting, it should remain the same for all increments of duration. This includes Bulb as it is under "M". I'd say there is something highly questionable about your camera!

I own three canon DSLR's and had a fourth. Manual mode is Manual mode and there should be "0" settings that auto adjust in that mode. How useful is a manual mode that auto adjusts the ISO?


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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: zerro1]
      #5930770 - 06/20/13 08:11 AM

My apologies in the delay everyone, I have been in the hospital for the past few days with the birth of my son.

Thanks for the info, ya I'm honestly not sure what's up with that because it seems screwy to me as well. I suppose as long as I understand WHAT it's doing the WHY doesn't matter as much as long as I can work around it. Sure is peculiar though.....


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Madratter
Postmaster


Reged: 01/14/13

Re: Been trying to avoid asking this but..... new [Re: AstroDan77]
      #5930799 - 06/20/13 08:37 AM

Congrats!

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Undermidnight
BEOTS "Tweener Cup" winner
*****

Reged: 05/25/04

Loc: Untermitternacht
Re: Been trying to avoid asking this but..... new [Re: Madratter]
      #5930802 - 06/20/13 08:40 AM

Congrats on the birth of your son!!

Jason


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AstroDan77
super member


Reged: 05/15/13

Loc: New Hampshire
Re: Been trying to avoid asking this but..... new [Re: Undermidnight]
      #5936558 - 06/23/13 02:56 PM

Thanks guys!

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Jeff2011
Carpal Tunnel
*****

Reged: 01/01/13

Loc: Sugar Land, TX
Re: Been trying to avoid asking this but..... [Re: AstroDan77]
      #5936737 - 06/23/13 04:46 PM

Congrats on the birth of your son.

I did not see where you mentioned the brand and model of your camera. You may want to check with the manufacturer to see if there is a firmware update for it.


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