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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 13 Aug 2017 (Sunday) 21:17
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Focus for the Eclipse

 
napolar
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Aug 13, 2017 21:17 |  #1

I have a 7D with a 70 - 200 F4L with a proper solar filter. I have been practicing taking pictures of the sun in preparation for the eclipse and it does not appear I am getting good focus. - Settings I am using for the full sun - ISO100, F8 with a tripod and solar filter. I have several more days and I am looking for advise. I can't wait to experience the eclipse, would love to get a few good shots of it as well.


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S.R.M.
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Aug 14, 2017 00:27 |  #2

Try manual focusing using liveview. You should be able to get some good shots with that lens and those settings. I used the same lens on a 50D for the shots below:

IMAGE: https://farm9.staticflickr.com/8209/8186933503_ae3540cb08_o.jpg
IMAGE LINK: https://flic.kr/p/dtsb​6V  (external link) 7 minutes before totality (external link) by Stephen Mudge (external link), on Flickr

IMAGE: https://farm9.staticflickr.com/8737/16831242928_146218d900_o.jpg
IMAGE LINK: https://flic.kr/p/rDjw​8A  (external link) Totality 2012 repro 2 (external link) by Stephen Mudge (external link), on Flickr

IMAGE: https://farm9.staticflickr.com/8712/17024831976_1811b3ed8e_o.jpg
IMAGE LINK: https://flic.kr/p/rWqH​pN  (external link) Prominences and corona (external link) by Stephen Mudge (external link), on Flickr

IMAGE: https://farm9.staticflickr.com/8343/8188015368_a37ea5dbf0_o.jpg
IMAGE LINK: https://flic.kr/p/dtxH​GL  (external link) Third contact diamond ring #2 (external link) by Stephen Mudge (external link), on Flickr

Hope the weather turns out well for you!


Stephen
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Davenn
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Post edited 11 months ago by Davenn. (2 edits in all)
     
Aug 14, 2017 04:31 |  #3

S.R.M. wrote in post #18427062 (external link)
Try manual focusing using liveview. ...............

wise advice from Stephen and I agree completely
Dont even attempt to use auto-focus


BTW, Stephen I was just a little further north of you for that eclipse ... north side of Palm Cove


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S.R.M.
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Aug 14, 2017 05:18 |  #4

Davenn wrote in post #18427138 (external link)
BTW, Stephen I was just a little further north of you for that eclipse ... north side of Palm Cove

Don't you wish that you were heading over to the US for this one Dave? I certainly do!!!
Oh well, will have to wait for 2028 I guess...



Stephen
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Inspeqtor
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Aug 14, 2017 08:32 |  #5

S.R.M. wrote in post #18427062 (external link)
Try manual focusing using liveview. You should be able to get some good shots with that lens and those settings. I used the same lens on a 50D for the shots below:


QUOTED IMAGE
IMAGE LINK: https://flic.kr/p/rWqH​pN  (external link) Prominences and corona (external link) by Stephen Mudge (external link), on Flickr


Hope the weather turns out well for you!

I LOVE this shot! Well done!!

I am not near enough for the full eclipse, I am at 88% but even this is better than I have ever been in before!


Charles
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Celestron
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Post edited 11 months ago by Celestron. (2 edits in all)
     
Aug 14, 2017 12:28 |  #6

I agree with manual focusing will probably be your best focus . However if you have the filter on and camera is on a tripod you can try using auto-focus and focus on the suns edge and see if the auto-focus points will focus and then switch back to manual focus before tripping the shutter with a remote . But for this to work you must adjust focus points to use center focus point only so you can see where the red focus point is located to move it to edge of sun . One other way is if your on location long before the eclipse starts you could try finding the moon without the filter and focus on the moon long before it gets close to the sun then switch over to manual focus and fine tune it and then don't touch it until the eclipse starts . Trial and error will be your only chance to focus if you wait until the eclipse starts and more likely you'll miss a lot of great shot chances before it's over with .




  
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Inspeqtor
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Aug 14, 2017 14:15 |  #7

Celestron wrote in post #18427419 (external link)
I agree with manual focusing will probably be your best focus . However if you have the filter on and camera is on a tripod you can try using auto-focus and focus on the suns edge and see if the auto-focus points will focus and then switch back to manual focus before tripping the shutter with a remote . But for this to work you must adjust focus points to use center focus point only so you can see where the red focus point is located to move it to edge of sun . One other way is if your on location long before the eclipse starts you could try finding the moon without the filter and focus on the moon long before it gets close to the sun then switch over to manual focus and fine tune it and then don't touch it until the eclipse starts . Trial and error will be your only chance to focus if you wait until the eclipse starts and more likely you'll miss a lot of great shot chances before it's over with .

I am hoping to do a Time Lapse of the eclipse starting 10 to 15 minutes before the moon is near the sun (12:57PM my time). I would first have my focus on the sun (of course) and would not be able to change the focus.

I am planning on taking a shot every 10 seconds (would 15 or 20 seconds be better?). Once the moon is in view, would the moon then be out of focus?

My test shots I did last week were ISO 100, 1/350 at f/5.6

This is cropped and re-sized only


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Charles
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Celestron
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Aug 14, 2017 14:22 as a reply to  @ Inspeqtor's post |  #8

If you focus on the sun before hand then keep that focus , don't change but put it in manual focus mode or when you start to expose the lens will try to refocus .




  
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Nogo
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Post edited 11 months ago by Nogo.
     
Aug 14, 2017 15:42 |  #9

With just a camera lens would the sun and the moon need a different focus? I would have thought they both would be at infinity.

Other than that, does the solar filter effect the focus enough that you would need to readjust when you take it off? I want to do like you say, focus the lens long before shooting, put it in manual focus and forget about it, if I can?


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S.R.M.
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Aug 14, 2017 16:45 |  #10

Inspeqtor wrote in post #18427241 (external link)
I LOVE this shot! Well done!!

I am not near enough for the full eclipse, I am at 88% but even this is better than I have ever been in before!

Thanks Charles!

An 88% partial will be nice, but honestly, if it is at all possible get in your car and drive to the path of totality!!! Totality is a completely different experience to even a 99% partial eclipse, and you should do whatever you can to experience it!



Stephen
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Capn ­ Jack
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Aug 14, 2017 17:05 |  #11

Nogo wrote in post #18427574 (external link)
With just a camera lens would the sun and the moon need a different focus? I would have thought they both would be at infinity.

Other than that, does the solar filter effect the focus enough that you would need to readjust when you take it off? I want to do like you say, focus the lens long before shooting, put it in manual focus and forget about it, if I can?

Keep in mind the focus may shift as the lens warms up just sitting in the sun, and it may cool down during totality and start to re-warm. There is a possibility of expansion and contraction as parts warm and cool causing focus shift. Consider taping your zoom ring too, I think the lens will point mainly vertical and the zoom ring may slip.




  
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napolar
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Aug 14, 2017 17:08 |  #12

Thanks all, everyone is always so helpful on this site! As soon as the sun comes back out, it has been pouring here all day, I will do the live view setup. Will post my results. SRM - I am hoping to be able to get something similar to your results, those shots are amazing! Inspeqtor, that is what I am shooting to get this week! Really nice capture as well.


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Celestron
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Aug 14, 2017 18:00 as a reply to  @ Nogo's post |  #13

When you focus on the suns edge there will not be a need to refocus cause the moon will be so dark that the moon will not come into fine focus , it will be a soft focused moon . But dont worry , if the sun edges are sharp that's all you need to worry about . If you take off the filter to capture corona a good chance the su will slightly defocus but a quick glimpse in the viewer and a fine touch on the focus ring will put you in good shape . Two minutes will go fast , just practice at manual focus and you'll be good to go . If you get overexcited you'll miss part of it . Be calm and have a good time and don't miss looking with your eyes during totality too !!




  
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Inspeqtor
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Aug 15, 2017 01:47 |  #14

Celestron wrote in post #18427504 (external link)
If you focus on the sun before hand then keep that focus , don't change but put it in manual focus mode or when you start to expose the lens will try to refocus .


Yes, I am fully aware of keeping it in manual focus. Sorry I did not make that clear.


Charles
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Aug 15, 2017 02:07 |  #15

S.R.M. wrote in post #18427622 (external link)
Thanks Charles!

An 88% partial will be nice, but honestly, if it is at all possible get in your car and drive to the path of totality!!! Totality is a completely different experience to even a 99% partial eclipse, and you should do whatever you can to experience it!

I appreciate your concern. I truly do wish I could do that, I would LOVE to see and be in a total eclipse but my body does not like long car rides anymore. If I am in a car for an hour my bottom is killing me. To get to the total eclipse would be a 6 hour drive, one way then when it is all done I gotta turn around and get back home. I would be in agony, really.


Charles
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Tokina AT-X Pro DX 11-20 f/2.8 * Sigma 17-70 f2.8-4 DC Macro OS * Sigma 150-500 f5-6.3 APO DG OS HSM
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Focus for the Eclipse
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