Can Live View Be Used To Count Sunspots?

Rita Ä Berkowitz wrote:
> If I point the camera towards the sun would I be able to view sunspots
> without a White-light filter or H-alpha (H-A) filter?

You're very likely to fry your eye and the camera sensor but if you're
interested in astronomy use of liveview, there is a very nice review of
the EOS40d at http://astrosurf.com/buil/eos40d/test.htm
HTH
fu2 sci.astro.amateur
--
Frédéric
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

Hi Rich

There is no doubt that full frame is the way to shoot the moon or the sun.
That can also be accomplished with a shorter FL scope and EP projection.
But for counting sunspots and seeing some detail without dropping a bundle,
then a 400mm with a Baader Astro Solar filter is an inexpensive (if you
already have the 400mm) intro to solar shooting. Then buy a PST and get
hooked on solar H-Alpha and discover there is insufficient backfocus and you
now need a larger solar scope and the slippery downhill slide into aperture
fever begins....

George

"RichA" <rander3127 RemoveThis @gmail.com> wrote in message
news:1189520891.914701.317490@r29g2000hsg.googlegroups.com...
On Sep 10, 10:56 pm, George Anderson <Not_h... RemoveThis @gone.com> wrote:
> Rita Ä Berkowitz wrote:
> > RichA wrote:
>
> >>> If I point the camera towards the sun would I be able to view
> >>> sunspots without a White-light filter or H-alpha (H-A) filter?
>
> >> Concentrate the light from the unfiltered sun with a lens onto the
> >> sensor and KISS it goodby.
>
> > I'm just trying to find a valid justification for Live View, that's
> > all. So
> > far it's not happening. I wonder if I can get Canon to remove it from
> > my Mk
> > III and get a $25 rebate?
>
> > Rita
>
> If the live view on the MkIII is the same thing (or similar) as the 20DA
> came with then slap on a piece of Baader film in front of the 400mm lens
> and you will be able to see a fair bit of detail in the sunspots as well
> as be able to count them.
> The sun is 0.5 of a degree in diameter so from your FOV of the 400 you
> should get an idea of the pixel resolution for the solar image.
>
> George- Hide quoted text -
>
> - Show quoted text -

You need 2000mm of focal length with a 35mm equivalent sensor size to
fill the field of view top of frame to bottom with the Sun. For a 1.5
crop, 1500mm.
Going below this is why camera lens pictures of the Moon, Sun are SO
inferior to longer focal length telescope images. If you can avoid
cropping
a sub-frame sized image, do so.
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

Rita Ä Berkowitz wrote:
> RichA wrote:
>
>>> If I point the camera towards the sun would I be able to view
>>> sunspots without a White-light filter or H-alpha (H-A) filter?
>>
>> Concentrate the light from the unfiltered sun with a lens onto the
>> sensor and KISS it goodby.
>
> I'm just trying to find a valid justification for Live View, that's
> all. So
> far it's not happening. I wonder if I can get Canon to remove it from
> my Mk
> III and get a $25 rebate?
>
>
Shooting using an ultra-wide lens where you need to get down
low on wet ground to see through the viewfinder to compose a
shot including foreground objects.
Yeah - you could wear waterproof leggings, or carry a mat to
crawl on, but if liveview was a $25 option, I'd take it any day.

Of course with the weird oddball sensor size IdIII,
ultra-wide isn't possible, so YMMV.
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

"georgea" <not_here.DeleteThis@nowhere.com> a écrit dans le message de news:
fc6a0h$nkg$1@dns3.cae.ca...
> Hi Rich
>
> There is no doubt that full frame is the way to shoot the moon or the sun.
> That can also be accomplished with a shorter FL scope and EP projection.
> But for counting sunspots and seeing some detail without dropping a
> bundle,
> then a 400mm with a Baader Astro Solar filter is an inexpensive (if you
> already have the 400mm) intro to solar shooting. Then buy a PST and get
> hooked on solar H-Alpha and discover there is insufficient backfocus and
> you
> now need a larger solar scope and the slippery downhill slide into
> aperture
> fever begins....
>
> George
>

Or wait for a better sunset than this one:
http://baron.phpnet.us/sigma/img_0408_taches_solaires.htm?size=1&exif=Y
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

In article <30mde3hrvfflc1mt7gov3tfsaulrrmqqa3.RemoveThis@4ax.com>, DSLR Honesty
<97971234.RemoveThis@maininator.com> wrote:

> On Tue, 11 Sep 2007 15:43:32 GMT, DSLR Honesty <97971234.RemoveThis@maininator.com>
> wrote:
>
> >
>
> Benefits of "Live Preview"?

Makes a nice crutch for people who don't know what they're doing?
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

On Sep 11, 4:51 pm, Randall Ainsworth <r....TakeThisOut@nospam.techline.com>
wrote:
> In article <30mde3hrvfflc1mt7gov3tfsaulrrmq....TakeThisOut@4ax.com>, DSLR Honesty
>
> <97971....TakeThisOut@maininator.com> wrote:
> > On Tue, 11 Sep 2007 15:43:32 GMT, DSLR Honesty <97971....TakeThisOut@maininator.com>
> > wrote:
>
> > Benefits of "Live Preview"?
>
> Makes a nice crutch for people who don't know what they're doing?

Like in-camera metering, AF, camera control of flashes, all that
newfangled stuff.
People can't keep repeating this same mantra every time some new
function is added to a DSLR.
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

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 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

On Sep 11, 8:45 pm, DSLR Honesty <97971....RemoveThis@maininator.com> wrote:

> Keep practicing with that overpriced doorstop of yours. I'm sure you'll figure
> out how to get decent photos out of it someday. Oh wait, how many years have
> you been practicing now, and you still can't get it right. Well, there's always
> the lovely "honorable mention" that goes to people like you, just for trying. I
> think they give them out to everyone at the Special Olympics too so nobody's
> feelings are hurt. Maybe you should sign up with them, because you clearly can't
> compete with fully functioning photographers.

Rita, I can smell your cunt.

-Multiple Miggs
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

"Ben Granger" <nospam.TakeThisOut@ever.org> wrote in message
news:nhobe31o3bqlfd0u3ndhf84rhk57mivvdq@4ax.com...
> On Mon, 10 Sep 2007 17:44:55 -0400, Rita Ä Berkowitz <ritaberk2O04
> @aol.com>
> wrote:
>
>>RichA wrote:
>>
>>>> If I point the camera towards the sun would I be able to view
>>>> sunspots without a White-light filter or H-alpha (H-A) filter?
>>>
>>> Concentrate the light from the unfiltered sun with a lens onto the
>>> sensor and KISS it goodby.
>>
>>I'm just trying to find a valid justification for Live View, that's all.
>>
>
> Oh, you're one of those <eye-roll>. Someone who has never obtained any
> experience with all the advanced capabilities of the P&S cameras that far
> surpass anything that any DSLR can do.
>
> How about this then:
>
> When taking images of waterfalls or rapids you can dial-in the slow
> shutter
> speed you need to see how much you are blurring the water, seeing it
> happen in
> real-time in the EVF. Instead of just hoping it'll be right.
Really, EVF previews the long shutter speed? are you sure? So when you have
a 1sec exposure, previewing that would require a framerate of 1 per sec -
that'll be useful I'm sure. Which camera's EVF previews shutter speed? Most
will preview overall exposure, but shutter blur preview, along with live DOF
preview isn't usually a feature. Can you give a specific model that will
preview the amount of shutter blur as you dial it in?

>You can see the
> exact effect you will get on your resulting image, instead of taking a
> photo,
> checking it, resetting to a slower shutter speed, taking another, checking
> it,
> resetting it ... ooops too late, that wading-bird in the scene that made
> it the
> most perfect award-winning photo was scared off by the gawdawful noises
> that
> your DSLR's shutter and slapping mirror were making.
Oops, while you were waiting for your 1 frame/sec EVF to focus, the bird
flew off anyway.. or this 1 frame/sec EVF you are talking about, which is
running 1 second behind live, doesn't show you that the bird flew away
before you press the button.
>Or if you want to dial-in
> the exact amount of motion blur you want in a batter's swing, or a bird's
> wing-beat, or the props of a plane. You will see the effect as you compose
> your
> shot and be able to capture exactly what you want.
Well no, you don't see the effect of the blur, but assuming you did, doing
so would require a delay and so composing on the EVF would be a waste of
time, because the subject would really be gone at the point you press the
button. And just how do you autofocus quickly on a moving subject with an
EVF camera?
If the subject is such that you have enough time to preview the effects on
an EVF, you also have enough time to just take multiple photos.
OR... better yet, use your experience to know good starting exposures, and
take it from there. Heck, that's how we used to take photos back when we
used that four letter F word. The instant feedback of digital is an extra
bonus. Yes previewing the exposure of your photo is handy, but not really
essential.
>
> Unlike every other DSLR on earth with only an OVF where none of this is
> ever
> possible, but it IS possible on nearly every P&S camera in existence with
> an
> LCD/EVF.
>
> Get your head out of your DSLR ass, it's been stuck up there so long with
> your
> ancient technology you can't even see the light.
>
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

On Tue, 11 Sep 2007 14:38:48 -0700, Rich <rander3127.TakeThisOut@gmail.com> wrote:

>On Sep 11, 4:51 pm, Randall Ainsworth <r....TakeThisOut@nospam.techline.com>
>wrote:
>> In article <30mde3hrvfflc1mt7gov3tfsaulrrmq....TakeThisOut@4ax.com>, DSLR Honesty
>>
>> <97971....TakeThisOut@maininator.com> wrote:
>> > On Tue, 11 Sep 2007 15:43:32 GMT, DSLR Honesty <97971....TakeThisOut@maininator.com>
>> > wrote:
>>
>> > Benefits of "Live Preview"?
>>
>> Makes a nice crutch for people who don't know what they're doing?
>
>Like in-camera metering, AF, camera control of flashes, all that
>newfangled stuff.
>People can't keep repeating this same mantra every time some new
>function is added to a DSLR.

LOL

Try to take their auto-focus away from them and they'd kill you. Their DSLRs are
more of a Point & Shoot camera today than even a P&S camera is. Guess which way
the DSLR is headed? To become a P&S camera. Because the P&S paradigm clearly has
more room for evolution and more advanced features. Once they get rid of that
amazingly limited OVF and noisy, image shaking, slapping mirror and ancient
shutter, all that's left is an advanced P&S. That's where I put money every
time, and always will. I don't invest in things that I know are headed the way
of the dinosaur. Intelligent people don't run down a hole chasing a failing
familiarity.
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

In article <1189546728.359550.80100.TakeThisOut@v29g2000prd.googlegroups.com>, Rich
<rander3127.TakeThisOut@gmail.com> wrote:

> Like in-camera metering, AF, camera control of flashes, all that
> newfangled stuff.
> People can't keep repeating this same mantra every time some new
> function is added to a DSLR.

Yeah boy! Nothing like holding a camera at arm's length...
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

On Wed, 12 Sep 2007 00:54:45 GMT, DSLR Honesty wrote:

> Oh, one more thing.

If only . . .


> I used to judge photo competitions.

Honest? If so, the secret's now out, Biddy. Now we know for sure
how you won so many awards, awards for pictures which you said that
you'll destroy before letting any of them be seen by others.
 >> Stay informed about: Can Live View Be Used To Count Sunspots? 

DSLR Honesty wrote:

....
> maggots on a dead and bloated fish.


And you are gracing us with a visit... why???
 >> Stay informed about: Can Live View Be Used To Count Sunspots?