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HelicopterAerial Photography and Video › Canon EOS Rebel XSi
12-27-2008 09:09 PM  8 years agoPost 41
daytonabeachrrElite Veteran - Oslo, Norway - My Posts: All  Forum  Topic

I use the Sigma 10-20 on my 40D, works well.
Heres a snap from this afternoon, a little dark and shady though, due to the low sun these days...

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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12-27-2008 09:19 PM  8 years agoPost 42
wjw

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Cape Coral, Florida​usa

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Highvis says his Autofocus on the sigma 10-22 does not work well, is this only his lens or all Sigma 10-22 on the canon body.
The canon lens seems a little more expensive and larger (more weight)
Atleast it appears that way in the photos.
what are your thaughts?
I am tired of trying to stitch 50 photos together for a 180

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12-27-2008 09:38 PM  8 years agoPost 43
monterey_tip

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Monterey, Ca - USA

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Highvis says his Autofocus on the sigma 10-22 does not work well, is this only his lens or all Sigma 10-22 on the canon body.
I have the Sigma 10-20 for my Nikon and it is pretty sharp....sharper than my Nikon DX lenses. Auto focus is fine. Sigma does have quality control issues though, so it is more common to get a bad lens. It is heavier and cheaper than the Canon 10-22. Both are good lenses.

Tip

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12-27-2008 09:43 PM  8 years agoPost 44
Highviz

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Newbury, Berks, UK

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Just for info - it is the 10mm fisheye I have - Not the 10-20

Malcolm

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12-27-2008 09:47 PM  8 years agoPost 45
daytonabeach

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Oslo, Norway

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Optically speaking, the Sigmas are usually as sharp as the Canons L series, believe it or not, but i have had several of both, and i once skipped the Canon 24-70 L and kept the Sigmas same version cause the Sigma was significant sharper than the Canon...
So, then, who cares about a noisy autofocus over that?
Maybe if you shoot birds in a quite wood

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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12-27-2008 10:30 PM  8 years agoPost 46
monterey_tip

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Monterey, Ca - USA

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I can't hear mine autofocusing when it's on the heli or mast.

Tip

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02-10-2009 11:41 PM  8 years agoPost 47
Hogster

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Surrey, UK

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Hi all

I would be grateful if you could put the following downlink options in order of preference, giving reasons ...

1) Use LiveView, set lens to infinity
2) Use LiveView, position servo over * button so 'Live mode' focus can be enabled whilst flying, even if it's just to ensure the focus hasn't drifted after it was set on the ground
3) Use a miniature camera mounted behind the eyepiece

Bearing in mind that cost-wise, 1 < 2 <<< 3 .... Ok I actually have a KX131 camera here but would need to get a different lens for it ... I think ...

I'm starting to favour 2) ... yes the focusing is slow but I can't see that being a problem - the helicopter shouldn't be wildly flying around anyway, so it should still be able to achieve a positive lock the majority of the time.

Many thanks for your input

David

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02-10-2009 11:57 PM  8 years agoPost 48
wjw

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Cape Coral, Florida​usa

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After a lot of testing, and still some more to go, here is what I am finding.
With my Sigma 10-20 lens infinity is not really infinity. You can manually set the lens for infinity be 50 feet in the air and your subject can still be out of focus. Not sure if that would still happen with a canon lens on the canon body.
Mounting a single servo on a carbon fiber plate, connected to a 3 way switch on the tx to hit the * button then trigger the camera for the shot seems to work okay. The benifit to this is that you still get to use the live view and you do not have to focus every shot. Down side is I still get some shots a little soft on the edges and its an extra step (small step) in the process.
I am going to build a view finder cam as I suspect I will get better results.

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02-11-2009 12:03 AM  8 years agoPost 49
Hogster

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Surrey, UK

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Hi wjw,

Thanks for your reply

So you're currently using the 'Live Mode' focusing feature of the XSi? When you say the downside is that you still get soft edges to some of the photos, is this because the focus wasn't set correctly / needs to be reset?

Re: setting the lens to infinity, I would have thought better practice would be to autofocus the camera first on something in the distance (which should be close-enough to infinity for our purposes), rather than using the focus scale on the lens (and you're right, infinity focus is seldom where the focus scale says it should be!) ...

Another related question is how relevant is DOF to aerial photography with a DSLR? I've never had an issue with the G9 as the DOF of a P&S is always enormous, even with the lens wide open ... I guess it depends how close you are to the subject ...

Thoughts are most welcome

Cheers,

David

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02-11-2009 02:28 AM  8 years agoPost 50
wjw

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Cape Coral, Florida​usa

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Hi David,
Yes, as of yet I am using the live view.
I think the trick to using the * button is to depress the button for 1 to 2 seconds as it can take this long to get an accurate focus.
You know when flying nose in over water with 2K worth of camera gear on your heli, your nerves kick into high gear and you start hitting that trigger switch pretty fast. Perhaps I got some soft edges on some photos because I did not give the camera enough time to "lock in" on the subject before I started shooting.
The regular auto focus seems to work much faster but here is where you loose your live view ( which is why I bought this camera in the first place ) Mind you I still think it is a awesome camera for A/P, just need to use it correctly.
I thaught the same thing about the DOF, most of my shots are taken in TV setting between 800 and 1250 shutter speed, 5.6 F stop, 200 ISO.
You are dead on correct about other Point and shoot cameras where infinity really means infinity. I have a Canon pro 1 that I just love to use, I set it on infinity and its perfect, same with my A650.
However stitching pannos with those using a wide converter is a real pain.

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02-11-2009 07:33 AM  8 years agoPost 51
Hogster

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Surrey, UK

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Hi wjw,

Hehe I know what you mean about hitting the trigger switch quickly! I think it will be quite nerve-wracking the first few flights with the 450 ....

Regarding not knowing how long to leave the * button depressed, does the focusing box not turn green when a good focus is achieved? At least that's how it appears to work for me .... and if you keep the button held down the box will stay green, so you don't need to look at the downlink the whole time it's focusing ...

Yes the proper auto-focus will be much quicker as the camera can use the phase detect AF sensors in the base of the camera body ... but like you said, the LiveView function was one of the reasons this camera was so appealing when I bought it (with the intention of using it for AP). I just wish they implemented a feature in the software where half-pressing the shutter in LiveView mode made the camera auto-focus, rather than having to mess about with the * button! ....

Will let you know how things go once I finish the helicopter and get the 450 flying

Cheers

David

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02-11-2009 04:27 PM  8 years agoPost 52
monterey_tip

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Monterey, Ca - USA

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I just wish they implemented a feature in the software where half-pressing the shutter in LiveView mode made the camera auto-focus, rather than having to mess about with the * button! ....
I really don't think live view is good enough yet. Even in my D300, which has a better Live view than the Xsi. I like it on the mast, but not so much on the heli. Looking through the lens, as soon as you line it up and hit the trigger, the live view goes blank from the mirror raising. I now prefer a full time miniature camera on the side to make sure I keep it lined up for a pano. The autofocus is much faster on the Xsi in non Live view mode.

Tip

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02-11-2009 07:19 PM  8 years agoPost 53
CKY

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Sunshine Coast, BC,​Canada

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Using live view with auto focus seems such an issue??

If using the cheap kit lens, 18-55, I found you need auto focus to compensate for the fact the barrel is so flimsy, overall focusing changes when a little side pressure is applied to the lens.

Could be why some shots are not clear at the edges??

Using a better wide angle lens, 10-22 or fisheye, why is autofocusing even used? You already have a very good DOF beyond 50 feet, stop it down to 5.6-8 to make sure. Shutter response will be immediate in manual focus mode, and mirror will only be up for as long as it takes to expose the shot and capture, no more focus groaning.

For the FEW times you REALLY need auto focus, just have to suffer though it.

The cheap kit lenses do not even have graduations, getting decent glass will probably double the quality and save a lot of time and hassel. Once you have a decent focus for infinity just mark and tape the lens to hold the setting. Just remember to remove tape before going back to autofocus.

I loved my Canon 10-22, still do, it has NO external moving parts, but the Sigma 8mm fisheye is permanently attached for panoramas. No need for any live view or view at all for panos. Just point and shoot.

My 2 cents, Chris

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