Bulb Photography Without Cable Release Or Remote?

[Snoweagle]

Heheh...I might have shouted, "Hey, WTF??!!"

Wah...like that i think it'll break out to a fight liao :bsmilie:

 

[catchlights]

$10???? my EOS 5 cable release is selling at 50-60 plus!!! tell me if i got the wrong info or am i cheated.... :dunno:

a standard type of mechanical cable release is only about $10.00, can EOS 5 use this?

 

[catchlights]

if you open the shutter for 30mins exposure, you move your camera for ½ second will make no effect on the image.

camera movement wont affect the image? why? i thought thats why we are using tripod? teach me....

½ sec, 1 sec, 2 sec, 4 sec, 8 sec, 15 sec, 30 sec, 1min, 2 mins 4 mins, 8 mins, 15 mins, 30 mins, underexpose by 12 stops, do you think can register anything on film or sensor?

 

[seeyf]

wow, this thread sure is popular...

I haven't done any bulb photography before, so here's a question for the experts:
How do you calculate the time needed for a bulb exposure? Also, what place in Singapore is dark enough to take star trails?

 

[Snoweagle]

wow, this thread sure is popular...

I haven't done any bulb photography before, so here's a question for the experts:
How do you calculate the time needed for a bulb exposure? Also, what place in Singapore is dark enough to take star trails?

Usually bulb exposures are done experimentally given the condition. For example a simple shoot of a landscape can be as short as a few minutes to star trails at a few hours. The last one i did bulb exposures is at punggol point.

 

[duhduh83]

½ sec, 1 sec, 2 sec, 4 sec, 8 sec, 15 sec, 30 sec, 1min, 2 mins 4 mins, 8 mins, 15 mins, 30 mins, underexpose by 12 stops, do you think can register anything on film or sensor?

get it
thanks!!!

 

[fWord]

Wah...like that i think it'll break out to a fight liao :bsmilie:

Whaha! Like that I'll run away first. Put everything in a big trash bag and then jump into the water and swim away.

 

[Snoweagle]

Whaha! Like that I'll run away first. Put everything in a big trash bag and then jump into the water and swim away.

But like that there's a chance where water will seep into the trash bag, even if it's tied tightly.

 

[fWord]

But like that there's a chance where water will seep into the trash bag, even if it's tied tightly.

Yeah, true also. But better that than to have my head kicked in!

Anyway, going back to film stuff. There's this thing called reciprocity failure when film is exposed for a longer time, such as beyond 1/3 seconds or so, causing film to become less sensitive and causing the final picture to be underexposed. Hence, it would seem that if my meter gives me a particular reading, I'll need to intentionally increase the exposure slightly to compensate. Do you have experience with this or know where I can get information on compensating for this issue with various films?

 

[Snoweagle]

Yeah, true also. But better that than to have my head kicked in!

Anyway, going back to film stuff. There's this thing called reciprocity failure when film is exposed for a longer time, such as beyond 1/3 seconds or so, causing film to become less sensitive and causing the final picture to be underexposed. Hence, it would seem that if my meter gives me a particular reading, I'll need to intentionally increase the exposure slightly to compensate. Do you have experience with this or know where I can get information on compensating for this issue with various films?

Hmmm not sure about this though, but i think you can do a search on it. There should have some gd sites addressing this issue.

 

[fWord]

Hmmm not sure about this though, but i think you can do a search on it. There should have some gd sites addressing this issue.

Thanks. Best would be the official websites of the producers of that particular type of film. Did a quick search yesterday but didn't come up with too much. I'm beginning to think that compensating for this problem is up to guesswork.

 

[catchlights]

Thanks. Best would be the official websites of the producers of that particular type of film. Did a quick search yesterday but didn't come up with too much. I'm beginning to think that compensating for this problem is up to guesswork.

Yes, reciprocity failure not only for long exposure, it also apply on extreme short exposure, and multiple pop flash exposure, you can find the info from the official websites, and also on the data sheet of film which inside the package box, but mostly on Pro grade film.

 

[Snoweagle]

Thanks. Best would be the official websites of the producers of that particular type of film. Did a quick search yesterday but didn't come up with too much. I'm beginning to think that compensating for this problem is up to guesswork.

That's what i do too, i just estimate the exposure time and time it with my watch. Surprisingly it bears good results. U can also try photography books, some have very gd pointers.

 

[lsisaxon]

Yeah, true also. But better that than to have my head kicked in!

Anyway, going back to film stuff. There's this thing called reciprocity failure when film is exposed for a longer time, such as beyond 1/3 seconds or so, causing film to become less sensitive and causing the final picture to be underexposed. Hence, it would seem that if my meter gives me a particular reading, I'll need to intentionally increase the exposure slightly to compensate. Do you have experience with this or know where I can get information on compensating for this issue with various films?

Here are some resources.

This Kodak info only tells you the range of useable exposure time.
http://www.silverprint.co.uk/PDF/e190.pdf

These Fuji info gives a table on how much to compensate.
http://www.silverprint.co.uk/PDF/NPZ800.pdf
http://www.silverprint.co.uk/PDF/NPH400.pdf
http://www.silverprint.co.uk/PDF/SuperiaReala.pdf

They are taken from this website.
http://www.silverprint.co.uk/colf5.html
http://www.silverprint.co.uk/colf6.html
http://www.silverprint.co.uk