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08/15/2017 05:10:04 PM · #51
I'm not sure you need a 16-stop ND filter. I shot the annular eclipse in Utah a few years ago with a 10-stop filter and don't recall there being any problems.

I should put all the caveats into that. I'm saying I was successful in taking pictures with the 10-stop filter. I wasn't trying to view the sun with it and I wasn't looking through the eye piece with it. Here's a Canon article about the eclipse. They don't even specify what is necessary other than saying 14-16 stop ND filters are not "safe" because they don't block UV light which can damage your eye.

Canon eclipse article

Message edited by author 2017-08-15 17:21:07.
08/15/2017 06:26:07 PM · #52
One data point on exposure... if you don't want to blow out the uneclipsed part of the sun, you probably need close to 16 stops. With the Baader Astrosolar film filter I made (16 stops) I get exposure for the sun of about 1/1000 @ f/8, ISO 100 in a clear sky. So yes, I could get by with a lower density filter, but not that much. I could go to f/11 and 1/8000, which would get me four more stops, so I need at least 12 stops. Might have close to a stop left at the top. Maybe. SO a 10-stop filter prolly would not get me where I need to go without stopping down past the point where diffraction will start to be a factor. I can also attest that at 16 stops, the sun in the viewfinder is plenty bright enough. This image is an example shot with the 16-stop filter:
' . substr('//images.dpchallenge.com/images_challenge/2000-2999/2505/120/Copyrighted_Image_Reuse_Prohibited_1202456.jpg', strrpos('//images.dpchallenge.com/images_challenge/2000-2999/2505/120/Copyrighted_Image_Reuse_Prohibited_1202456.jpg', '/') + 1) . '
FWIW, my plan for my long focal length imaging is as follows:
- Canon 5d Mk IV with 100-400 IS II, 1.4x III teleconverter for an effective 560mm focal length.
- Celestron CG5 equatorial mount, with Manfortto 421RC4 geared head attached via a 2.5" tall spacer (to give me room to move the camera to the proper orientation)
- Laptop with EOS utility loaded to control the camera
- I'll be shooting in live view and using DPAF to focus (I've found it's much easier than trying to ensure good focus manually) every few minutes from the start of the eclipse
- I'll be shooting with the filter in place until just before totality, then removing the filter for the totality shots, and replacing it just after totality ends after (hopefully) getting a shot or two of the "diamond ring" effect.
- I'll finish out shooting every few minutes until the end of the eclipse
08/15/2017 06:46:48 PM · #53
When I was shooting in Utah, the sun was relatively low on the horizon (maybe less than 20 degrees) and Monday the eclipse will be at 43 degrees where I hope to be. That might make a difference.

I just came across this and it seems helpful (assuming it's accurate). This site would recommend shooting at 1/6400, ISO 100, f/8 with a ND4 filter so I might need to add to my 10-stop because the sun is higher. Personally I'm not worried about shooting the partial portions of the eclipse, but rather enjoying it and prepping for shooting a boatload of shots during totality.

Another stress inducing fact is the site says to shoot the Chromosphere during totality is 1/3200 while shooting earthshine is 7s which is nearly 16 stops different. I want to be doing as little fiddling with the camera during totality so I can just watch it, but it will be hard to cover that range with bracketing. I know the Mark IV can do up to 7 exposures. Thinking out loud, I could do 2.25 stops between exposure which would cover the 16 stops.

Solar Eclipse exposure calculator

Message edited by author 2017-08-15 18:51:37.
08/15/2017 10:53:34 PM · #54
It looks like he is very close to my numbers... for partial phase, he gives 1/640, f/8, ISO 100 when using an ND5 filter (equivalent to 16.6 stops). So my 1/1000 at those settings is right in the ballpark with my 16.0 stop film.
I think that a 5-shot series with 3 stops between shots would cover well. Starting at 1/1000 and ending at about 4 seconds (1/1000, 1/125, 1/15, 1/2, 4). With tracking the 4-second shot should be feasible, if pushing the long end. Anyhow, for the longer exposures, atmospheric turbulence may be a bigger factor than tracking error. We will see! That is, we will see if the weather allows, LOL.
08/16/2017 07:53:35 AM · #55
Where are you heading to take shots?

Originally posted by kirbic:

It looks like he is very close to my numbers... for partial phase, he gives 1/640, f/8, ISO 100 when using an ND5 filter (equivalent to 16.6 stops). So my 1/1000 at those settings is right in the ballpark with my 16.0 stop film.
I think that a 5-shot series with 3 stops between shots would cover well. Starting at 1/1000 and ending at about 4 seconds (1/1000, 1/125, 1/15, 1/2, 4). With tracking the 4-second shot should be feasible, if pushing the long end. Anyhow, for the longer exposures, atmospheric turbulence may be a bigger factor than tracking error. We will see! That is, we will see if the weather allows, LOL.
08/16/2017 02:28:09 PM · #56
Originally posted by pgirish007:

Where are you heading to take shots?


I'll be somewhere between Western Wyoming and Eastern Oregon. I'm going to make the final decision on the general area on Saturday, at which point I will already be nearby.

Message edited by author 2017-08-16 14:28:21.
08/16/2017 04:04:19 PM · #57
I did some prep work at home today and here is the result!

' . substr('//images.dpchallenge.com/images_portfolio/60000-64999/60581/120/Copyrighted_Image_Reuse_Prohibited_1204165.jpg', strrpos('//images.dpchallenge.com/images_portfolio/60000-64999/60581/120/Copyrighted_Image_Reuse_Prohibited_1204165.jpg', '/') + 1) . '

Setup was: 640mm, 1/2000 at 5.6 with ISO 2000 handheld.
08/16/2017 04:04:53 PM · #58
That would be far for otherwise I would have come :)

Originally posted by kirbic:

Originally posted by pgirish007:

Where are you heading to take shots?


I'll be somewhere between Western Wyoming and Eastern Oregon. I'm going to make the final decision on the general area on Saturday, at which point I will already be nearby.
08/16/2017 08:10:28 PM · #59
Originally posted by pgirish007:

That would be far for otherwise I would have come :)

Originally posted by kirbic:

Originally posted by pgirish007:

Where are you heading to take shots?


I'll be somewhere between Western Wyoming and Eastern Oregon. I'm going to make the final decision on the general area on Saturday, at which point I will already be nearby.


LOL, yes, it is quite the haul for me; much worse for you! I'm kinda using this eclipse as an excuse for a major road trip :-)
08/17/2017 09:49:08 AM · #60
We are headed out....Hiawassee,GA here we come ....

Sooo I've been reading your comments...do you really think we should shoot in HDR? I only have 3 exposures...what do you think I should set my exposures at? Nikon D7000
08/17/2017 01:38:33 PM · #61
Originally posted by Ja-9:

We are headed out....Hiawassee,GA here we come ....

Sooo I've been reading your comments...do you really think we should shoot in HDR? I only have 3 exposures...what do you think I should set my exposures at? Nikon D7000


I'd only bracket if you are confident in setting it up (and canceling it) quickly. Bracketing is only a benefit during totality. It can certainly be done manually as well. Exposure really depends on what you want to capture. Jason's link to the exposure calculator is a really great resource, IMO.
08/17/2017 01:42:25 PM · #62
We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?
08/17/2017 02:05:30 PM · #63
Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?

Make it a Minimal Editing challenge, then folks can just upload from their location.
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<runs and hides>
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BTW - I am just kidding, seriously. :-)
08/17/2017 04:48:18 PM · #64
Originally posted by glad2badad:

Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?

Make it a Minimal Editing challenge, then folks can just upload from their location.
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<runs and hides>
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BTW - I am just kidding, seriously. :-)


Standard....give us a week to get home n process properly...please

Barry you can run but you can't hide!!!!
08/17/2017 05:34:10 PM · #65
Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?


I'm in agreement with Janine... definitely Standard, no need for Extended, IMO. I'll be on the road for a week after the eclipse, but that's no reason I can't get something processed and submitted. That's *if* I get something worth submitting, LOL!
08/17/2017 05:37:15 PM · #66
Originally posted by kirbic:

Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?

I'm in agreement with Janine... definitely Standard, no need for Extended, IMO. I'll be on the road for a week after the eclipse, but that's no reason I can't get something processed and submitted. That's *if* I get something worth submitting, LOL!

YOU are *required* to submit and we'll publicly mock you if you do not.
08/17/2017 06:57:44 PM · #67
Originally posted by kirbic:

Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?


I'm in agreement with Janine... definitely Standard, no need for Extended, IMO. I'll be on the road for a week after the eclipse, but that's no reason I can't get something processed and submitted. That's *if* I get something worth submitting, LOL!


There's that!!!
08/17/2017 07:11:12 PM · #68
Originally posted by Bear_Music:

We're definitely gonna do a special challenge for this. The question is, how long of a posting window do we need to allow folks to get back from where they've gone and process their images. At first we thought "Speed Challenge" but that seems a bit extreme. Also, am I correct in assuming this should be Standard Editing, not Extended?


Placing a deadline a week after the eclipse date would be genuinely appreciated. I'll be near the Wind River Reservation in Wyoming. The journey is only 342 miles one way, but I'll be traveling cross country to avoid the "totality-seeking" masses on the main highways. Then, there is the gasoline shortage issue... real or imagined... the highways will be congested. The weather forecast is now only "fair", but I expect the experience to be "once-in-a-lifetime" event.

eta: standard ruleset, please

Message edited by author 2017-08-17 19:13:47.
08/17/2017 07:46:04 PM · #69
We'll put it up on Saturday then and allow a week for processing and entering. I want to let everyone know that right now 'cuz some of you may not actually be "here" when it goes up. Rest assured! Your masterpieces WILL have a home :-)
08/17/2017 09:41:27 PM · #70
Have fun all you eclipse followers! I will be here, which is somewhere in the 67% path. So it'll get a little darkish. Anything fun we can do in the 67% path? Other than take the day off from work because it's also my birthday? (Yes, yes, I arranged this all for you!)
08/17/2017 09:54:02 PM · #71
Originally posted by Melethia:

Have fun all you eclipse followers! I will be here, which is somewhere in the 67% path. So it'll get a little darkish. Anything fun we can do in the 67% path? Other than take the day off from work because it's also my birthday? (Yes, yes, I arranged this all for you!)

Yeah, you can shoot a 67% Eclipse and make it sing. Definitely doable :-) And Hippo Birdsday to You in advance!
08/17/2017 10:42:11 PM · #72
Smartphone + Solar Eclipse Glasses = Solar Eclipse Photos. :-)
08/18/2017 09:36:45 AM · #73
Originally posted by glad2badad:

Smartphone + Solar Eclipse Glasses = Solar Eclipse Photos. :-)


I wonder if it's also possible (i.e. safe) to hold solar eclipse glasses in front of the lens on a small point and shoot camera?
08/18/2017 10:03:57 AM · #74
Originally posted by glad2badad:

Originally posted by glad2badad:

Smartphone + Solar Eclipse Glasses = Solar Eclipse Photos. :-)


I wonder if it's also possible (i.e. safe) to hold solar eclipse glasses in front of the lens on a small point and shoot camera?

It should be "safe" as long as thew lens is completely covered by either the film or frame of the glasses. You will probably have to figure out how to pre-focus as the autofocus is unlikely to work through the filter.
08/18/2017 12:53:17 PM · #75
Originally posted by GeneralE:

Originally posted by glad2badad:

Originally posted by glad2badad:

Smartphone + Solar Eclipse Glasses = Solar Eclipse Photos. :-)


I wonder if it's also possible (i.e. safe) to hold solar eclipse glasses in front of the lens on a small point and shoot camera?

It should be "safe" as long as thew lens is completely covered by either the film or frame of the glasses. You will probably have to figure out how to pre-focus as the autofocus is unlikely to work through the filter.


Best bet for focus is to set it to manual and infinity. That's what I do on my Android 'phone. On Android, you need to set the camera app to "pro" mode, then set for manual focus at infinity.
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