(meteorobs) Sigma Hydrid Fireball

[Leo S]

Nice shots Koen!

I noticed you were using ISO 1000 on many of your exposures. With the 
earlier Canon EOS DSLRs, using the "in-between" ISO settings (ie other 
than 100, 200, 400, 800, 1600) is not recommended since the camera 
actually uses the next ISO setting up, and then adjusts the gain to 
"simulate" the ISO you chose. So if you pick ISO 1000, the camera will 
actually use ISO 1600, and then under-expose to simulate ISO 1000. This 
means that your exposure will be at least as noisy (maybe even more so) 
as ISO 1600, but you won't capture as bright meteors as with true 1600.

So you may as well just use ISO 1600 (or ISO 800 and increase the gain 
yourself in post processing). Either should yield better/cleaner images 
than using an in between ISO like ISO 1000.

The more recent Canon EOS bodies behave differently, so using in-between 
ISOs is not a problem as far as I'm aware.

Clear skies!
Leo

PS. The Sigma Hydrid fireball seems to have the wrong ISO listed for 
your exposure. It should be "800" rather than "80" I'm guessing! :)


Koen Miskotte wrote:
> Hello list,
> Finally, today I made the last composition of the Geminids I captured with 
> my Canon EOS 10D and Canon EOS 40D. They were both equipped with two Canon 
> EF 15 mm F 2.8 lenses (one I could borrow from Peter van Leuteren) and timer 
> controllers TC-80N3.
>
> The Canon EOS 10D was pointed to northern direction and captured two 
> Geminids of magnitude -5 and -4 and two possible Hydrid fireballs of 
> magnitude -5 and -8 (from this one only the last and brightest part is 
> captured).
>
> The Canon EOS 40D was pointed to southern direction and captured many 
> Geminids of magnitude +1 to -5. A sporadic meteor of -2 was also captured by 
> this kamera.
>
> www.koenmiskotte.nl
>
> I wish all of you a happy new year and good meteor hunting for 2010.
> Koen
>
>
>
> ----- Original Message ----- 
> From: "Koen Miskotte" <koen.miskotte at versatel.nl>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: Thursday, December 17, 2009 5:47 PM
> Subject: Re: (meteorobs) Sigma Hydrid Fireball
>
>
>   
>> Hello Robert,
>> Last Geminid campaign I was in Portugal with Michel Vandeputte, Roy 
>> Keeris,
>> Peter van Leuteren, Sietse Dijkstra & Inneke Verkerken in order to escape
>> bad weather in the Netherlands.  We had a splendid view on this impressive
>> stream! We logged about 8- 12 hours and observed an impressive Geminid
>> return.
>> We also noticed strange sigma Hydrid activity. We observed three fireballs
>> of magnitude -4, -5 and even a nice All of them are photographed with
>> several camera's.
>> When the pictures are online I will post a message.
>> Regards, Koen
>> ----- Original Message ----- 
>> From: "Robert Lunsford" <lunro.imo.usa at cox.net>
>> To: <meteorobs at meteorobs.org>
>> Sent: Wednesday, December 16, 2009 10:16 PM
>> Subject: (meteorobs) Sigma Hydrid Fireball
>>
>>
>>     
>>> A photograph of my -7 Sigma Hydrid is now posted on Carl Hergenrother's
>>> fine blog site: The Transit Sky: Comets, Asteroids, Meteors
>>>
>>> Visit:
>>> http://transientsky.wordpress.com/2009/12/15/dec-131415-and-the-peak-of-the-geminids/
>>>
>>> The fireball passes to the right of the Big Dipper. Note that the star
>>> Phecda (Gamma Ursae Majoris) appears to be obscured by a
>>> cloud.
>>>
>>> Bob Lunsford
>>>
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>
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