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  1. #1
    LostBoyNZ's Avatar
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    Lightbulb My first photos of the sun + Baader VS Seymour Solar Film



    Took my first photos of the sun today, with an 8" Meade LX200 and a 5D Mark II DSLR. This is my solar filter, before I added the cardboard flaps over each filter. That way I'm only using 1 filter at a time, but I can change without having to un-stick the entire thing from the scope.



    This allowed me to compare Baader Solar Film and Seymour Solar Film. I used Live View to look at the sun and take the photos using burst mode.

    I see what people mean by atmospheric conditions now. I found it extremely hard to focus with the microfocuser because it was constantly changing on its own. No matter what I couldn't seem to get it any sharper than the photos I took below. My DSLR with T-Mount was as far inside the microfocuser as it would go (I assume that's how it should be?)

    Any tips at all would be a huge huge huge help before the Venus Transit. Thanks!!

    Baader Solar Film (white balance pushed up turn it yellow) at 1/500, ISO 1000, 5D Mark II:



    100% CROP:



    Seymour Solar Film at 1/80, ISO 3200, 5D Mark II:


    100% CROP:



    I wasn't able to get any better focus with the Seymour Solar Film. It was also much darker, so I had to use a much higher ISO and much slower shutter speed (that would have resulted in more blur too) to snap a photo.

    Comparing the solar films more, the Seymour film was much easier to cut. I didn't have to worry about cutting causing crinkles in the film like I did with the Baader stuff. For photography however, so far I much prefer the Baader film. For purely visual use though, the Seymour film gives that nice orange look I expect.

  2. The Following 7 Users Say Thank You to LostBoyNZ For This Useful Post:

    astrobl (05-25-2012),bigjack (05-22-2012),darethehair (05-22-2012),jimt (05-22-2012),jrkirkham (05-22-2012),LEDHead (05-25-2012),rlmangum (05-29-2012)

  3. #2
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    Thanks for the useful experiment. A lot of people discuss the differences, but I'm not sure I've read many that used such a controlled environment.
    Rob
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  4. #3
    LostBoyNZ's Avatar
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    You're welcome If anyone has any questions I'm more than happy to answer.

    I found a small piece of Baader ND 3.8 (photographic) film online which I just ordered now. It lets in 16x the light, so I should be able to get a much faster shutter speed and lower ISO. That should improve my odds of a sharp shot.

    Someone else also suggested stacking with RegiStax 6. I'm having difficulty stacking photos in there, it seems more for video. I'll give it a try with a solar video next week

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    Pushing the color to yellow from a Baader Astrosolar Safety Film equipped image my be more esthetically pleasing, but the actual natural color of the photosphere is white. Baader film slightly shifts this toward blue, but you can convert the image to grayscale to provide proper color fidelity.
    Matthew Ota
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  6. #5
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    Your first attempt was much better than mine today!
    I used a 500mm telezoom lens with the Seymour filter, Nikon D90, f5.6 1/20 ISO200 and had the same problems with it being very dark.


    I had loaned my tripod to a friend though so this was shot freehand.
    I'll be trying again this weekend with the tripod and hopefully a loan 2x teleconverter this time.

  7. #6
    LostBoyNZ's Avatar
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    Interesting! At the moment I prefer the fake yellow look, but who knows, I might prefer the true white color in the future. It's in raw format, so thankfully I can just adjust it back.

    Actually yours looks pretty similar to mine But I think the difference might be in the zoom, since mine was at 2000mm and yours is 500mm. The 2x teleconverter should help. However any shot at 500mm with that low shutter speed and freehand, that isn't a big blur is very impressive!

    It seems like the Seymour filter might be best used for visual only, not photography.

    Actually I took one with my 100-400mm lens and a 2x teleconverter last year. This was before I knew about solar filters, and I used a 10x ND filter with a shutter speed of 1/8000th and f/20. Of course I never looked through the view finder, I used Live View only and had the lens covered for all but a couple of seconds to line up and take the photo. I was worried it might heat up the sensor.

    Looking back, I wouldn't recommend that method, but with such a crazy fast shutter speed it was so sharp, even viewed at 100%.


  8. #7
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    Received my 3.8 ND Baader solar photo film over the weekend, and put the third film into my solar filter today. I also put silver colored tape over the flap of that one, as a reminder for when I'm using it, that it's different and not to look through the scope when that one is open (photographic use only).







    There's a gap on the top there, where it fits around my dovetail rail.

    I took some photos today, although they aren't what I'd call sharp. Also the bottom of the sun kept going darker when the sun got lower in the frame. I wonder if I made the off axis filter for the photographic film too big. I can't think of any other reason, because it doesn't happen with the other filters. Easy fix though, just make a smaller ring to go on top of it. I'll try that tomorrow.

    I'll give Registax 6 another big go with these photos and see if I can figure out how to use it this time, hehe. Will post the results

  9. #8
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    EEK! The weather for New Zealand is not looking good at all for tomorrow... snow / sleet / cloud all over the place. Here it's gonna be a high of 5 degrees with "Rain, turning to snow. Bitterly cold southerlies.". Yet Thursday is sunny and fine. Doh! Today there was some clear sky towards mountains near here, but I'll have to hope for the same tomorrow.

    Recently I figured out how to get the scope to track the sun, so that's a big help. Also I learned a bit more about how the microfocuser works (I can see it physically retracts or extends the tube).

    Wasn't able to figure out why the bottom of the image gets darker though. It doesn't look like that at all in Live View, only when I actually see the photo it took on the screen. Reducing the size of the filter hole didn't seem to help. Hmm.

    Quite happy with the focus on this particular shot (YAY!!!!) but it also demonstrates how the bottom is darker. Since that's where Venus will be, I'm hoping to figure that out. As a last resort though, I can try and adjust to compensate for it in Adobe Lightroom.

    1/4000th Shutter Speed / ISO 640 / 5D Mark II



    100% Crops:



 

 

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