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Help needed Anonymous
sup /p/
I frequent the board but never post here
I'm a total nubcake with photography but recently purchased a Rebel XTi 10.1

I'm going camping in a month in a very rural area of northern Ontario and plan on taking an exposed picture of the stars.
I wanted to know how long i should wait to get the stars around full circle?
>> Anonymous
9000
>> Anonymous
EPIC TROLL
>> Anonymous
pro-tip.

how long does it take for the earth to rotate around its axis.

take that nu,ber and minus the amount of day time and thats as long as youll get.

pro-tip V2
go to the arctic/antarctic during their deepest winters.
>> Anonymous
>>184421
to get something like that pic, I'd say 4 hours probably... I used to be really into photography but you need the right film... usually between 800-3200 ISO and also a reallllllly slow shutter speed... I dont know about the specs on the shutter speed but I hearded thats how you get to take pics like yours
>> Anonymous
>>184434
no, youd want a REALLLY slow film/low ISO to get that.

higher ISO's will give you crazy long exposure noise.

and to be more specific, that pic is probably a combination of ~10 long exp pics, after ~40mins-1hr you get mad noise no matter what iso your using.
>> Anonymous
not to mention your battery dies pretty damn quickly during long exposures
>> Anonymous
>>184430
id like to see EXIF from that.
Exposure time: 7776000 sec
>> Anonymous
you're all faggots.
You need one manual camera w/ bulb mode, tripod, remote shutter, SLOW SPEED FILM.

Look up reciprocity failure for lulz
>> Anonymous
Unless>>184421lives in the poles, getting a complete circle is not possible. For best possible results, aim your camera near the pole star. Stars near the north star = more curved paths.
>> Anonymous
>>184498
Incorrect. If you can see the north star, you can get complete circles. The earth's axis is tilted.

>>184437
This pic is in fact probably not a composite. It is probably a long exposure (20-30 minutes) done on film with compensation for reciprocity failure. For extremely long exposures, film is easier to work with than digital.
>> Anonymous
>>184505
it has to be a composite, how else would the moon not blur and be correctly exposed.

also, even if you can see the northstar, to get a 24hr exposure/complete circles, you still need somewhere it is dark for at least 24hrs at a time.
>> Anonymous
http://startrails.de/html/software.html

This.
>> Anonymous
>>184508
oh righttttttttT

i think there's some confusion around the term "full circle star-trails"

to me that means EVERY star does a full circle star-trail, hence the suggestion of going to the arctic/antarctic....
>> Anonymous
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>>184507
The moon is an obvious shoop. The star trails might be a composite, but there is really no reason for them to be, and if they are the exposures were taken one immediately after the other because the trails are continuous.

>to get a 24hr exposure/complete circles, you still need somewhere it is dark for at least 24hrs at a time.
In order to get complete circles, you don't need to do a 24 hour exposure. It takes 24 hours for a single star to make a circle, but there are many stars and even a fairly short exposure with the north star in view will produce the appearance of complete circles.

Note the pic (taken from google image search) 1 hour exposure taken in New York, on ISO 100 Fuji slide film. http://www.guidescope.net/starfields/circles_50mm.htm

Camera-Specific Properties:Camera SoftwareAdobe Photoshop 7.0Image-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution72 dpiVertical Resolution72 dpiImage Created2002:12:17 19:06:18Color Space InformationsRGBImage Width432Image Height288
>> Anonymous
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This is delicious nubcake. You must eat it.