Technical advise on d7d

[alogirf]

I'm a possible buyer of a KM d7d when available. On the meantime I'm researching in forums, sample galleries and pdf datasheets to learn about this, -I presume wonderful slr digicam- d7d will be.

I read in a datasheet that the shutter range goes from 1/4000 to 30 seconds and "Time exposure (bulb) possible"; I don't understand what this means, is it maybe meaning that you can keep the shutter "open" as long as you keep the shutter knob pushed?, same as you can do with most of the slr film cameras?.

If meaning something else, does anybody know if you get this possibility, (useful to take very long expositions, i.e. night or astronomical purposes) with this or anyother digital camera?
--
Salvador

 

[pramarko]

Most of other DSLRs (if not all) have BULB, so why not 7D...

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
IE is a bug! Get yourself a smarter pet - FireFox!

 

[E Scott Cragg]

In technically means shutter-open-as-long-as-you-hold, however, it generally implies the use of a remote-release of some form or other...

It is a standard feature on all SLRs and DSLRs, as well as most 'enthusiest' film camera's (Point-and-shoot sensors generally can't handle it)

A lot of DSLR's are limited to 30 minute exposures or something along those lines - in that case- most astro-photographers will 'stack' their exposures for maxiumum effect (take six 30 minute exposures and combine then in photoshop).

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
Happy 10D User.

http://mail.rochester.edu/~ec009j/ESC 's%20Online%20Portfolio/

http://www.pbase.com/eridanman

 

[alogirf]

Thanks, now I understand it!, obviously you have to relese the shutter by means of a cable or one of this ancient "rubber bulbs" (might the industrially used term come from this?, I have at the moment a Sony W-1, which is not bad (very fast, terrible movie mode, many manual settings...) of course not "bulb".

I presume it's nothing but a mistaken when you say: "30 minute", my W-1 has an underlimit of 30 seconds, which I presume have most of the P-a-S digicams.

I've been for a loooong time watching and downloading photos from Steve's, Dcresource, dpreview -of course the best- trying to make up my mind about what to buy to jump from my Nikkormat FTN to the "digital world" and I'm so convinced that Sigma's and its exclusive Foveon with their stacked 3 layer sensors technology should be the very best, and all the side-by-side sensor based sensitive devices (ccd's or cmos) shoul be at lightyears distance in the delivered s/n ratio.

Unfortenatelly I cand afford all cameras I'd like to posses to make the tests for myself, but from the samples I see from the specialized reviews, (if my eyes are working ok), the sharpness, and chromatic fidelity delivered by Sigma's, or Canon Digital Rebel (also cmos based) is definetely much better than many other cameras with much higher "theorethical" specifications and prices. Really I don't understand why Foveon's world isn't advancing, being adopted by other excellent photographic trades like Nikon, Canon and so many others, and the only one I know was going to make a Foveon's based digicam was Polaroid (think not the actual Polaroid but a far east trade -china or so-) which is announced since long time ago and I think it has never been really marketed.
Really I don't understand what happens with Foveon!!
Thanks for your help
Salvador

It is a standard feature on all SLRs and DSLRs, as well as most
'enthusiest' film camera's (Point-and-shoot sensors generally can't
handle it)

A lot of DSLR's are limited to 30 minute exposures or something
along those lines - in that case- most astro-photographers will
'stack' their exposures for maxiumum effect (take six 30 minute
exposures and combine then in photoshop).

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
Happy 10D User.

http://mail.rochester.edu/~ec009j/ESC 's%20Online%20Portfolio/

http://www.pbase.com/eridanman

--
Salvador

 

[santoguapo]

Thanks, now I understand it!, obviously you have to relese the
shutter by means of a cable or one of this ancient "rubber bulbs"
(might the industrially used term come from this?, I have at the
moment a Sony W-1, which is not bad (very fast, terrible movie
mode, many manual settings...) of course not "bulb".
I presume it's nothing but a mistaken when you say: "30 minute", my
W-1 has an underlimit of 30 seconds, which I presume have most of
the P-a-S digicams.

Actually, most SLR's will do 30 "minutes". If you do astrophotography, you will enjoy this feature.

I've been for a loooong time watching and downloading photos from
Steve's, Dcresource, dpreview -of course the best- trying to make
up my mind about what to buy to jump from my Nikkormat FTN to the
"digital world" and I'm so convinced that Sigma's and its exclusive
Foveon with their stacked 3 layer sensors technology should be the
very best, and all the side-by-side sensor based sensitive devices
(ccd's or cmos) shoul be at lightyears distance in the delivered
s/n ratio.
Unfortenatelly I cand afford all cameras I'd like to posses to make
the tests for myself, but from the samples I see from the
specialized reviews, (if my eyes are working ok), the sharpness,
and chromatic fidelity delivered by Sigma's, or Canon Digital Rebel
(also cmos based) is definetely much better than many other cameras
with much higher "theorethical" specifications and prices. Really I
don't understand why Foveon's world isn't advancing, being adopted
by other excellent photographic trades like Nikon, Canon and so
many others, and the only one I know was going to make a Foveon's
based digicam was Polaroid (think not the actual Polaroid but a far
east trade -china or so-) which is announced since long time ago
and I think it has never been really marketed.
Really I don't understand what happens with Foveon!!
Thanks for your help
Salvador

It is a standard feature on all SLRs and DSLRs, as well as most
'enthusiest' film camera's (Point-and-shoot sensors generally can't
handle it)

A lot of DSLR's are limited to 30 minute exposures or something
along those lines - in that case- most astro-photographers will
'stack' their exposures for maxiumum effect (take six 30 minute
exposures and combine then in photoshop).

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
Happy 10D User.

http://mail.rochester.edu/~ec009j/ESC 's%20Online%20Portfolio/

http://www.pbase.com/eridanman

--
Salvador

--
Rich

 

[David Martin]

Actually, the Foveon is pretty ropy for high-ISO noise.

The D7D appears to be limited to 30sec exposures, so if you are looking mainly for astro-photography you would be far better off with a 20D.

Not that the M7D does not look like a fine camera, but in this particular application the 20D is simply outstanding.

It is a standard feature on all SLRs and DSLRs, as well as most
'enthusiest' film camera's (Point-and-shoot sensors generally can't
handle it)

A lot of DSLR's are limited to 30 minute exposures or something
along those lines - in that case- most astro-photographers will
'stack' their exposures for maxiumum effect (take six 30 minute
exposures and combine then in photoshop).

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
Happy 10D User.

http://mail.rochester.edu/~ec009j/ESC 's%20Online%20Portfolio/

http://www.pbase.com/eridanman

--
Salvador

--
Regards,
DaveMart
Please see profile for equipment

 

[Ricwind]

You don't really think bullb means 30sec max......come on think about it!

Is the camera going to close the shutter after 30secs on a locked cable release?

Why have a useless 'b' that only runs for 30sec, if you can set 30secs on manual and shutter priority.......Doh!

B means B, same as any other camera, 20D included.

Actually, the Foveon is pretty ropy for high-ISO noise.
The D7D appears to be limited to 30sec exposures, so if you are
looking mainly for astro-photography you would be far better off
with a 20D.

Not that the M7D does not look like a fine camera, but in this
particular application the 20D is simply outstanding.

It is a standard feature on all SLRs and DSLRs, as well as most
'enthusiest' film camera's (Point-and-shoot sensors generally can't
handle it)

A lot of DSLR's are limited to 30 minute exposures or something
along those lines - in that case- most astro-photographers will
'stack' their exposures for maxiumum effect (take six 30 minute
exposures and combine then in photoshop).

I'm a possible buyer of a KM d7d when available. On the meantime
I'm researching in forums, sample galleries and pdf datasheets to
learn about this, -I presume wonderful slr digicam- d7d will be.
I read in a datasheet that the shutter range goes from 1/4000 to 30
seconds and "Time exposure (bulb) possible"; I don't understand
what this means, is it maybe meaning that you can keep the shutter
"open" as long as you keep the shutter knob pushed?, same as you
can do with most of the slr film cameras?.
If meaning something else, does anybody know if you get this
possibility, (useful to take very long expositions, i.e. night or
astronomical purposes) with this or anyother digital camera?
--
Salvador

--
Happy 10D User.

http://mail.rochester.edu/~ec009j/ESC 's%20Online%20Portfolio/

http://www.pbase.com/eridanman

--
Salvador

--
Regards,
DaveMart
Please see profile for equipment

 

[PerOP]

The D7D appears to be limited to 30sec exposures, so if you are
looking mainly for astro-photography you would be far better off
with a 20D.
Not that the M7D does not look like a fine camera, but in this
particular application the 20D is simply outstanding.

Where is this information from?? I've read through the 7D manual and seen no mention of a 30sec limitation for "bulb" exposure.

From the "Bulb exposures" section in the manual:

"To take the picture, press and hold the shutter-release button for the duration of the exposure. Releasing the shutter button ends the exposure. The monitor is blank during the exposure and remains blank after the exposure for up to 30 seconds while noise-reduction processing is applied to the image."

There will be up to 30secs of post-processing, so what the image will end up looking like we'll have to see. It might even be better then whatever the 20D can deliver!

 

[David Martin]

Yeah, perhaps you are right - I just saw the 30sec thing in the manual, and my mind went back to my old D7, which for some odd reason if my memory serves me correctly was limited to 30secs, and no-one could ever quite work out why that should be, either.
Still, let's hope you are right and there is no such limit on the M7D

The D7D appears to be limited to 30sec exposures, so if you are
looking mainly for astro-photography you would be far better off
with a 20D.
Not that the M7D does not look like a fine camera, but in this
particular application the 20D is simply outstanding.

Where is this information from?? I've read through the 7D manual
and seen no mention of a 30sec limitation for "bulb" exposure.

From the "Bulb exposures" section in the manual:
"To take the picture, press and hold the shutter-release button for
the duration of the exposure. Releasing the shutter button ends the
exposure. The monitor is blank during the exposure and remains
blank after the exposure for up to 30 seconds while noise-reduction
processing is applied to the image."

There will be up to 30secs of post-processing, so what the image
will end up looking like we'll have to see. It might even be better
then whatever the 20D can deliver!

--
Regards,
DaveMart
Please see profile for equipment