Will the sun damage lens coatings?
Apr 12, 2024 08:40:08 #
Sidwalkastronomy
Loc: New Jersey Shore
Robertl594 wrote:
You may be right, however, I don’t want to risk damaging my lens. That would be a really sad day. It was $14,000. I ordered a solar sheet to cover the front element. Will see how that works.
With the solar sheets I found during the last eclipse an easy way to mount them on the lens is to find a PVC pipe that fits over the l ens and stretch the film, don't worry if it's not tight, and then use foam on inside to snug it down. I the use blue non stick painters tape to secure it on the outside.
I would never point a non protected camera lens directly to the sun. Too big of risk
With telescopes the first thing in the optical chain is the filter. It's your expensive le s not mine. Just my 2 cents
Apr 12, 2024 08:46:02 #
wdross
Loc: Castle Rock, Colorado
Robertl594 wrote:
Maybe. But if the energy from the light were to focus on any of the elements for any amount of time, and it damaged any of the elements, that would trash the lens. I don’t want to take that risk. (Very expensive lens. $14k)
Since we don’t have another total eclipse for another 20 years, I have time to make a solar filter to cover the front element of the lens. Will do using this. 8"x8" Solar Filter Sheet for Telescopes, Binoculars and Cameras
https://a.co/d/jfEQe6W
Since we don’t have another total eclipse for another 20 years, I have time to make a solar filter to cover the front element of the lens. Will do using this. 8"x8" Solar Filter Sheet for Telescopes, Binoculars and Cameras
https://a.co/d/jfEQe6W
No eclipses in the US until 2044 (the tail end of one at the US/Canadian border) and 2045. But there are a bunch to go to in other continents and countries. There are at least three nice ones before 2030.
Apr 12, 2024 08:54:58 #
Sidwalkastronomy
Loc: New Jersey Shore
wdross wrote:
No eclipses in the US until 2044 (the tail end of one at the US/Canadian border) and 2045. But there are a bunch to go to in other continents and countries. There are at least three nice ones before 2030.
Once you've seen one total you can get hooked. People travel all over the world for various reasons so find an eclipse and travel to it
Apr 12, 2024 09:18:22 #
Sidwalkastronomy wrote:
Once you've seen one total you can get hooked. People travel all over the world for various reasons so find an eclipse and travel to it
Yes, I get it. It is a pilgrimage by solar addicts.
Apr 12, 2024 09:35:47 #
Sidwalkastronomy
Loc: New Jersey Shore
I want to Alliance Nebraska for 2017, I had my solar filter telescope, F 5. 400mm. On an AVX tracking mount. I used computer program, images plus, programed to take 10 different exposures every 5 minutes before and after totality. For totality I took photos with different exposures as fast as my camera could without clogging the buffer.
I wound up with 1512 photos.
I wound up with 1512 photos.
Apr 12, 2024 10:10:43 #
Orphoto wrote:
I have never heard of coating damage, always only shutter curtain and/or sensor. Highly unlikely glass elements would be adversely affected. Will be curious to see how the henhouse reacts here.
Henhouse or Dodo Farm.
Apr 12, 2024 10:38:29 #
Apr 12, 2024 11:22:16 #
Apr 12, 2024 12:28:33 #
richardsaccount wrote:
Nice set. Your third shot is the first one that I've seen with sunspots. 
Thank you very much. Thanks for noticing! I paid particular attention to not over expose (blowing out highlights) so they can be seen.
RL
Apr 12, 2024 12:49:31 #
Robertl594 wrote:
Thank you! Not sure if you are right, however you makes total sense. I will not use a drop in filter! I did order one of these from Amazon to make a filter for the front element. 8"x8" Solar Filter Sheet for Telescopes, Binoculars and Cameras
https://a.co/d/jfEQe6W
https://a.co/d/jfEQe6W
I'm not sure I am right either, and I truly do not think coatings are in danger, I think the danger comes from anything near the focal plane, however iris's are delicate and why take the chance when a front solar filter that blocks IR &UV are inexpensive and widely available.
I think you did the right thing
Beautiful pix
Apr 12, 2024 14:02:32 #
azted wrote:
Nice work. The solar flares are very well defined!
Those are not solar flares. They are solar promenices. A completely different thing.
Apr 12, 2024 14:08:13 #
azted
Loc: Las Vegas, NV.
Drbobcameraguy wrote:
Those are not solar flares. They are solar promenices. A completely different thing.
Thanks. I will try to remember that! (after I look it up)
Apr 12, 2024 14:14:43 #
I would be more concerned with sensor damage. Lens should be fine just don’t face it on sun for hours
Apr 12, 2024 16:14:25 #
Apr 13, 2024 16:33:23 #
Orphoto
Loc: Oregon
One more minor point. Even though you are not going to rely on the drop in filter for solar protection you should still be using it, likely with a clear filter. Long lens optical formulae are designed with the assumption that a glass element of some sort will be in that filter holder. Furthermore, if you pull the holder altogether you have a huge light leak and open to the elements issue.
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