Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Read More.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 23 Jul 2012 (Monday) 10:16
Prev/next
sponsored links
(this ad will go away when you log in as registered member)

Focusing the image

 
VaiFanatic
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 23, 2012 10:16 |  #1

I've seen some amazingly clear/sharp images of the night sky, but I never seem to be able to focus right. Everything is slightly blurry.

I've been using my nifty-fifty with an f-stop of 1.8, mostly at around ISO 800, f/2.8, with 8 second exposures.

What's the best thing for me to do to focus the lens so it's crystal clear?


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as registered member)
B ­ Koo
Member
130 posts
Joined Nov 2009
New Jersey
Jul 23, 2012 10:20 |  #2

f/11


Canon Rebel XS - 18-55mm IS - 75-300mm - 50mm f/1.8II

LOG IN TO REPLY
armis
Senior Member
Joined Jan 2012
Jul 23, 2012 10:29 |  #3

B Koo wrote in post #14756681external link
f/11

Only if you really enjoy star trails. And even then, not really.

Live View, zoomed to the max if you have it. Otherwise, a bunch of test shots at various focus distance. You could maybe try auto-focusing on the moon if it's out, though I can't guarantee the results.


Fuji X-E1, 18-55 and 55-200 zooms
www.wtbphoto.comexternal link

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 23, 2012 10:39 |  #4

armis wrote in post #14756728external link
Only if you really enjoy star trails. And even then, not really.

Live View, zoomed to the max if you have it. Otherwise, a bunch of test shots at various focus distance. You could maybe try auto-focusing on the moon if it's out, though I can't guarantee the results.

I've tried the auto focus approach with the moon before, images turn out OK, more or less. I've been using Live View zoomed to the max, and manually focusing, but I'm never quite sure of how well I'm focused.

I'll try again tonight.


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 23, 2012 12:12 |  #5

Here are two jpgs stacked together. Couldn't use the raw files because I wasn't using the latest beta.

My processing skills aren't all that great at all either.

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE

Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
A.S.I.G.N. ­ Observatory
Goldmember
A.S.I.G.N. Observatory's Avatar
Joined Aug 2008
Canberra, Australia
Jul 23, 2012 14:45 |  #6

armis wrote in post #14756728external link
Only if you really enjoy star trails. And even then, not really.

Live View, zoomed to the max if you have it. Otherwise, a bunch of test shots at various focus distance. You could maybe try auto-focusing on the moon if it's out, though I can't guarantee the results.

^^^^This.

If the moon is out the sky will not have the contrast you want. A bright star should do to focus on. Like the post above said, use live view zoomed in to the max. Use MANUAL focus, focus to infinity then back it off ever so slightly to find the sweet spot. Most lenses focus just past infinity so you have to fiddle with it slightly to get it right. Keep your aperture all the way open - you need all the light into the lens you can get.

Yes, your processing skills need work - that will come slowly as you practice more, but processing won't help you if you don't get the focus right and capture some decent photons!

I hope this helps.


Australian Wildlife Photographer
My Steel Iron Man build thread
ASIGN Observatory II (external link)

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 23, 2012 16:49 |  #7

A.S.I.G.N. Observatory wrote in post #14758055external link
^^^^This.

If the moon is out the sky will not have the contrast you want. A bright star should do to focus on. Like the post above said, use live view zoomed in to the max. Use MANUAL focus, focus to infinity then back it off ever so slightly to find the sweet spot. Most lenses focus just past infinity so you have to fiddle with it slightly to get it right. Keep your aperture all the way open - you need all the light into the lens you can get.

Yes, your processing skills need work - that will come slowly as you practice more, but processing won't help you if you don't get the focus right and capture some decent photons!

I hope this helps.

Thanks! I'll give it another shot tonight. The moon will be setting early for the next few days, so I don't have to worry about it. I've been practicing focusing on stars, but I can't ever tell if I've hit that sweet spot or not. It's times like these I wish some folks with similar interests lived near me that I could get together with.


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
cyberon
Senior Member
cyberon's Avatar
540 posts
Joined Jan 2010
Perth, Australia
Jul 24, 2012 08:44 |  #8

Usually the sharpest is when the bright star seems the smallest. Out of focus star at maximum magnification looks like a doughnut!


500D, Speedlite 430EX II, Lens : 15-85mm; 50mm F1.8 II; 100mm F2.8L IS Macro; 70-200mm F4L; Samyang 8mm F3.5
U/W : G11, OEM Housing, Inon S2000, Inon D4 Tray, Inon UCL-165 Close up lens
Astro : Modded 1100D, ES 80ED, Skywatcher HEQ5 Mount, Astrotrac TT320X-AG, Astronomik CLS Clip in filter

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 24, 2012 15:17 |  #9

Didn't get a chance to really try last night. I got incredibly tired, so I knocked out before midnight. Hopefully tonight I'll be awake long enough to try for some better results!


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 29, 2012 12:41 |  #10

Another attempt has yielded no better results. I've used live view to focus, and I've used AF on a distant light, and nothing seems to be getting it just right. Stars around the center are somewhat clear, but off in the corner the really blur and even seem to have an oval halo around them.

I shot this at f/1.8, ISO 400 for 5 seconds. I took 1 others and stacked them, but the halos were only exaggerated further.

IMAGE: http://farm8.staticflickr.com/7252/7670119440_9d45e829e4_z.jpg
[IMAGE'S LINK: http://www.flickr.com .../83315202@N03/76701​19440/] (external link)
IMG_2163 (external link) by VaiFanatic (external link), on Flickr

Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
Jim ­ Shaffer
Junior Member
25 posts
Joined Jan 2012
Jul 29, 2012 22:43 |  #11

The corners of a star shot with my 50mm f1.8 are terrible. Supposedly it gets better if you stop it down, but then you end up needing a lot longer exposure than you would at 1.8.




LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Jul 30, 2012 01:03 |  #12

Hmm, I've been distracted by web development, so I haven't had a chance to go out tonight, but we shall see. I've taken a picture before with the 50 wide open and the corner stars were not that bad.


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
lifeinpixels
Member
lifeinpixels's Avatar
88 posts
Joined Aug 2012
Southern California
Aug 04, 2012 01:31 as a reply to VaiFanatic's post |  #13

If there is enough light, stopping you lens down just a bit will improve overall sharpness and make it a tad easier to focus as well.


"They say a picture is worth a thousand words. Mine are only worth one."
Canon 1Ds [mk1] - EF 35mm ƒ2 - EF 50mm ƒ1.4 USM
Flickr | 500pxexternal link | Feedback

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Aug 05, 2012 03:26 |  #14

I'll give it a try tomorrow night.


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
VaiFanatic
THREAD ­ STARTER
Member
VaiFanatic's Avatar
93 posts
Joined Jun 2012
San Antonio, Texas
Aug 05, 2012 23:19 |  #15

I've figured it out, why all of my images on the tripod have been coming out so terribly. Well, it's an old tripod from the 70s, for a Minolta. It's more or less a portable option until my nice manfrotto gets here.

When the shutter goes off, it moves the causes the camera to jerk ever so slightly, causing motion blur.

I did my best to ground the tripod, and got a much better result, but couldn't repeat my efforts.

But now I now I know what my problem is.


Canon EOS 60D | Canon EF 400mm f/5.6L USM | Canon EF 2x III Extender | Canon EF 50mm f/1.8 II (nifty fifty) | Canon EF 40mm f/2.8 STF (sporty forty) | Canon EFS 18-200mm f/3.5-5.6 | MD-EOS Adapter | Minolta MD Rokkor-X 50mm f/1.4 | Minolta MD Rokkor-X 28mm f/2.8 | Minolta MD Rokkor-X 135mm f/3.5

LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as registered member)

3,038 views & 0 likes for this thread
Focusing the image
FORUMS Photography Talk by Genre Astronomy & Celestial Talk


Not a member yet? Click here to register to the forums.
Registered members get all the features: search, following threads, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, settings, view hosted photos, own reviews and more...


AAA

Send feedback to staff    •   Jump to forum...    •   Rules    •   Index    •   New posts    •   RTAT    •   'Best of'    •   Gallery    •   Gear    •   Reviews    •   Polls

COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Privacy policy and cookie usage info.

POWERED BY AMASS 1.4version 1.4
made in Finland
by Pekka Saarinen
for photography-on-the.net
Spent 0.00157 for 6 database queries.
PAGE COMPLETED IN 0.03s
Latest registered member is vikingjul458
516 guests, 413 members online
Simultaneous users record so far is 5577, that happened on Mar 02, 2016