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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 08 Jul 2020 (Wednesday) 10:02
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Comet C/2020 F3 Neowise

 
docholliday_sc001
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Jul 19, 2020 07:19 as a reply to  @ post 19095488 |  #76

Here's the disposable masks after cutting:


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And testing for fit:

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kezug
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Jul 19, 2020 08:27 |  #77

docholliday_sc001 wrote in post #19095508 (external link)
Here's the disposable masks after cutting:
thumbnail
Hosted photo: posted by docholliday_sc001 in
./showthread.php?p=190​95508&i=i153467337
forum: Astronomy & Celestial


And testing for fit:
thumbnail
Hosted photo: posted by docholliday_sc001 in
./showthread.php?p=190​95508&i=i183777354
forum: Astronomy & Celestial

Wow, I continue to learn something new all the time. I have never heard of the Bahtinov mask before.
The way I would focus at night is to do all the steps mentioned, but without the mask, and just to try to get my bright star as small (not blurry) as possible..but I never felt if I had the best focus as the camera would shake a little while I focused and it just was hard.

Question, these mask size...is it just a matter of size for the lens and thats it or is there a lot of other math to factor in based on lens specs?


Camera's: 70D, G12 | Len's: 18-135mm IS STM, 55-250mm IS STM, 50mm f/1.8 II | Photos:flickr (external link)

  
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2cruise
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Jul 19, 2020 09:01 |  #78

IMAGE: https://live.staticflickr.com/65535/50129252011_cafc93c2a8_b.jpg
IMAGE LINK: https://flic.kr/p/2jnK​w9t  (external link) Neowise Comet 7/18/2020 (external link) by Whisle (Clyde Cornett) (external link)

5D Mark IV~70-200L f4~16-35 f4L IS ~Zeiss 25mm f2~Zeiss 50mm f2 Makro-Planar~ Sigma 24-105 Art~Lee filters
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Inspeqtor
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Jul 19, 2020 09:28 |  #79

kezug wrote in post #19095530 (external link)
Wow, I continue to learn something new all the time. I have never heard of the Bahtinov mask before.
The way I would focus at night is to do all the steps mentioned, but without the mask, and just to try to get my bright star as small (not blurry) as possible..but I never felt if I had the best focus as the camera would shake a little while I focused and it just was hard.

Question, these mask size...is it just a matter of size for the lens and thats it or is there a lot of other math to factor in based on lens specs?

You can BUY the Bahtinov Masks from B&H Photo (external link) or Adorama (external link) even Amazon (external link) has them.

Make the the MASK is a bit LARGER than the OUTSIDE diameter size of the LENS, or preferably the lens HOOD diameter if you have a lens hood.


Charles
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Inspeqtor
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Post edited 10 months ago by Inspeqtor.
     
Jul 19, 2020 09:41 |  #80

Inspeqtor wrote in post #19095550 (external link)
You can BUY the Bahtinov Masks from B&H Photo (external link) or Adorama (external link) even Amazon (external link) has them.

Make the the MASK is a bit LARGER than the OUTSIDE diameter size of the LENS, or preferably the lens HOOD diameter if you have a lens hood.

Some of the Bahtinov Masks are listed in INCH sizes, others are listed in METRIC (usually MILLIMETER) sizes. If you need to convert from one to the other, do this:

if you measure IN INCH then multipy inch X 25.4 to get the metric millimeter size.
If you measure IN METRIC MILLIMETER then divide millimeter by 25..4 to get the INCH size.

HTH! (Hope This Helps)


Charles
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1Zach1
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Jul 19, 2020 10:26 |  #81


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docholliday_sc001
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Jul 19, 2020 14:09 |  #82

kezug wrote in post #19095530 (external link)
Wow, I continue to learn something new all the time. I have never heard of the Bahtinov mask before.
The way I would focus at night is to do all the steps mentioned, but without the mask, and just to try to get my bright star as small (not blurry) as possible..but I never felt if I had the best focus as the camera would shake a little while I focused and it just was hard.

Question, these mask size...is it just a matter of size for the lens and thats it or is there a lot of other math to factor in based on lens specs?

You can buy them if you don't have a way of cutting them. They're usually fairly affordable and the key is to be sure they cover the whole lens, with a hair of overlap at the edges. The only thing is that are usually for telescopes, so larger body tubes (sizes) are more common.

I have piles of lenses and multiple systems, so it was easier and cheaper for me to just cut the sizes I needed to fit without having to buy a few different masks. For the longer hoods, I just measure the ID of the hood, cut that size, and wedge it into the hood. The shallow hoods, like the 16-35, don't hold them as well so I make them fit over the end of the lens. That's what those strips of paper in the cutter shot are.

The only math formula I use is for those strips: since I know the diameter of the mask, I can figure the circumference of the lens easily to cut the strips. Then, I just make a cap out of the two pieces for a quick, disposable "cap".

The Wikipedia article (external link) shows how it works and what to expect.




  
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Inspeqtor
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Jul 19, 2020 15:34 |  #83

docholliday_sc001 wrote in post #19095738 (external link)
You can buy them if you don't have a way of cutting them. They're usually fairly affordable and the key is to be sure they cover the whole lens, with a hair of overlap at the edges. The only thing is that are usually for telescopes, so larger body tubes (sizes) are more common.

I have piles of lenses and multiple systems, so it was easier and cheaper for me to just cut the sizes I needed to fit without having to buy a few different masks. For the longer hoods, I just measure the ID of the hood, cut that size, and wedge it into the hood. The shallow hoods, like the 16-35, don't hold them as well so I make them fit over the end of the lens. That's what those strips of paper in the cutter shot are.

The only math formula I use is for those strips: since I know the diameter of the mask, I can figure the circumference of the lens easily to cut the strips. Then, I just make a cap out of the two pieces for a quick, disposable "cap".

The Wikipedia article (external link) shows how it works and what to expect.

I would have no idea how to cut my own mask. It appears way more complex than I could figure out. What type of heavy paper stock do you use to cut them out of?


Charles
Canon EOS 90D * Canon EF-S 18-135mm f/3.5-5.6 IS USM* Flickr Account (external link)
Tokina AT-X Pro DX 11-20 f/2.8 * Sigma 17-70 f2.8-4 DC Macro OS * Sigma 150-600 f5-6.3 APO DG OS HSM Contemporary
Canon 18-55 IS Kit Lens * Canon 70-300 IS USM * Canon 50mm f1.8 * Canon 580EX II

  
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docholliday_sc001
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Post edited 10 months ago by docholliday_sc001. (2 edits in all)
     
Jul 19, 2020 16:41 |  #84

Inspeqtor wrote in post #19095777 (external link)
I would have no idea how to cut my own mask. It appears way more complex than I could figure out. What type of heavy paper stock do you use to cut them out of?

I don't use anything special, just scrapbook cardstock. Pretty much just an acid-free version of construction paper that kids use. 100 sheets for around $8-10 or less. Much less for cheap paper. It doesn't have to even be thick paper if you don't want a reusable one! You could even use printer cardstock, construction paper, or plastic sheets (just cut up a cheap binder).

The ScanNCut is basically a printer/plotter with a blade instead of ink, so it takes a CNC plotter approach to auto-cutting vinyl/paper/balsa. Makes for cutting things like viewfinder masks, cucoloris, and other patterned things easy. Cutters like the SnC, Cricut, or Silouette Cameo are popular with crafters for cutting t-shirts, cards, vinyl stickers, rubber stamp patterns, etc. If you know somebody who has one, you could easily have them cut masks for you. I'll bet that somebody you know or their wife/daughter probably has one, most likely a Cricut Explore as it's the most popular and basic. The Cameo is popular with vinyl/t-shirt people and the ScanNCut is held dearly by sewing/quilting people (and crazy people like me who have completely off-the-wall ideas).

If you have the time and patience, there's PDF files here (external link) to cut your own using the printed file, plastic sheets, and an Exacto knife. Again, they're for telescope tube sizes, but I'll bet that the 100mm is pretty close for most 70-200, 16-35, 100-300, and 100-400 barrels. The one I cut for my 70-200/2.8L II was 96mm for a tight fit.




  
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sidg
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Jul 19, 2020 18:09 |  #85

Comet Neowise over the Treasure Valley, Idaho from near Bogus Basin.


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Jul 19, 2020 18:15 |  #86

This is a shot from last night. Actually it is 3 shots stacked and edited in Photoshop. Just starting to play with stack and Photoshop edit. In Boise the comet was definitely not as bright last night — not sure if it was from thin clouds that were visible before sunset or if it is starting to dim. I hope that I can get another clear bright night .....

3 images, 200 mm, ISO 12800 f2.8, 3.2 seconds.


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Jul 19, 2020 19:50 |  #87

One more of Comet Neowise from me, I wanted to record the event from near home and managed this one about 30m from our front door


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Jul 19, 2020 20:07 |  #88

We went out to the Blue Ridge Parkway near Asheville, NC on Saturday looking for the comet. We had tried a different area of the BRP on Friday, but the storms never cleared - we got an impressive light show from the lightning, but no stars or comet. Saturday night was much better, and we were able to get some decent shots.

IMAGE: https://photos.smugmug.com/Other/Comet-Neowise/i-DSdr29c/0/ad8b9b16/X2/JM_2020_07_18_Comet_Neowise_001-X2.jpg
IMAGE LINK: https://photos.smugmug​.com …owise_001-X2.jpg&lb=1&s=A  (external link) on Smugmug

IMAGE: https://photos.smugmug.com/Other/Comet-Neowise/i-pNj7tKk/0/0ad718e0/X2/JM_2020_07_18_Comet_Neowise_003-X2.jpg
IMAGE LINK: https://photos.smugmug​.com …owise_003-X2.jpg&lb=1&s=A  (external link) on Smugmug

IMAGE: https://photos.smugmug.com/Other/Comet-Neowise/i-sDxWX6m/0/b89cc469/X2/JM_2020_07_18_Comet_Neowise_010-X2.jpg
IMAGE LINK: https://photos.smugmug​.com …owise_010-X2.jpg&lb=1&s=A  (external link) on Smugmug

IMAGE: https://photos.smugmug.com/Other/Comet-Neowise/i-x2KhvWK/0/147f1a67/X2/JM_2020_07_18_Comet_Neowise_007-X2.jpg
IMAGE LINK: https://photos.smugmug​.com …owise_007-X2.jpg&lb=1&s=A  (external link) on Smugmug

The Moose is Loose!
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docholliday_sc001
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Jul 19, 2020 20:39 |  #89

EOS_Fan wrote in post #19095862 (external link)
One more of Comet Neowise from me, I wanted to record the event from near home and managed this one about 30m from our front door
thumbnail
Hosted photo: posted by EOS_Fan in
./showthread.php?p=190​95862&i=i6535710
forum: Astronomy & Celestial

That turned out quite well for being in town and having a lot of light pollution around!




  
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Jul 19, 2020 22:31 |  #90

14 images tracked and stacked in deep sky stacker then LN.

X-Pro3 & 50mm f2

ISO:160, 30 sec. exp., f2



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