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HomeAircraftHelicopterAerial Photography and Video › XTI and Mark IV mount?
02-05-2008 02:51 AM  10 years agoPost 1
vrwired

rrVeteran

Boulder County, CO

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Ok,
Little problem..I am wanting to put maybe an XTI in my mark IV gimble.. Thing is I am going to have to use a ccd through the viewfinder for visual downlink.

I noticed that the litte ccd really sticks out the back a bunch.. From what I can perceive If I tilt the camera lens down towards the ground, The little ccd is going to pivot up and get in the way of the top of the gimble pan gear. It may actually hit it..

Has anyone fitted a DSLR or specifically an Rebel XTI with a ccd in the viewfinder on the Mark IV mount from helicam?

Any pics would be great.. Or ideas.. If you know it will fit, let me know..

Thanks in advance...
Untill I get this figure out I can't yet purchase a camera yet..

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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02-05-2008 03:23 AM  10 years agoPost 2
rroback

rrElite Veteran

Irvine (UCI), Ca

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I had a mark iv and used it with my 5d, and it worked, but it was close. For the 5d, the gimbal was too narrow, I had to mount the camera body aft, behind the pivot, which was decent for cg, but a little annoying. I didn't have any issues with my ccd cam, it only stuck out about an inch from the eyepiece.

Rhett..... I can't fly, but the Profi sure can.

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02-05-2008 02:26 PM  10 years agoPost 3
phover

rrApprentice

Joliette, QC, Canada

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I use the RebelXti with the Mark IV. I should shorten the length of the camera connector to reduce unbalanced CG, but it does the job for now. I shoot video most of the time and my video cam is well balanced in the gimbal.

Here is what it looks with the Rebel Xti and 10-22 lens (heavy). With the 18-55 lens, the CG is ok but I don't really like this lens

Cheers,

Martin

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02-05-2008 04:55 PM  10 years agoPost 4
HawkEyeMedia

rrApprentice

Fort Worth, Texas

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I had to modify my Mark IV by replacing the "L" shaped frame with a new one that was taller, which allowed the lower gimbal to hang lower. This required longer legs to maintain ground clearance.

Wait 'til you decide to mount the XTi in portrait mode with the video camera mounted on the eye piece.

You can make the camera fit, but it won't be balanced which really throws the stabilization out of whack.

Mark LaBoyteaux
HawkEyeMedia.com

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02-05-2008 07:50 PM  10 years agoPost 5
vrwired

rrVeteran

Boulder County, CO

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phover.. wow.. thanks for the pic..
You are kinda far forward in the pic on the cam mount..you can't move the camera back a bit? I guess you really dont have to though.. I don't think I will even use the gyros for still images. I don't think I will need them.. My camera operator will just line it up and shoot. Have you tried moving the cam back like rroback does with his 5D? I am also going to be using the 10-22... is the 10-22 really worth it?... is the kit 18-55 capable of some decent pics.. I know not quite as wide, but I could just fly a little further out.

Gyros are good for video.

HawkEyeMedia..
Yeah a longer L bracket would be nice. But lots of mod needed.
I was thinking of maybe just extending the "swinging" cam mount plate legs down a bit.. maybe some spacers... Only thing is that would then increase the radial leverage wich may be to much on the servos... not sure. Maybe just a little bit of spacer would not hurt?

rroback... Man if you can squeeze a 5d in there I should be able to get an XTI to work!

So.. I think it comes down to the fact that I can use the XTI with a ccd.. Other wise I would go for the A640, I really want a DSLR mounted up though.

HawkEyeMedia.... I know you know alot about this mount. I am having some issues with possible binding or tightness. I run the mount on regulated 6 volt to get all the torque I can get out of the servos..

Everything on the most part spins freely but some of the axis are experiencing a binding or tightmess of sorts at a certain place in the rotation.. Any ideas.. should I pull the axis' apart and lube them?.. I would guess I dry graphite lube or something? Hawkeye.. If you (or anyone else) has fixed binding or tightness in the Mark IV mount let me know what you did!

So I guess it is a go on ordering an XTI .. now I just need to decide on the 10-22 or the 18-55...

Anymore Mark IV guys (and gals) chime in!

Thanks...

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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02-06-2008 10:09 AM  10 years agoPost 6
ron g

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Baton Rouge, LA

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the rebel XSI has video out i belive... i just purchased the 40D and
the XTI and very recently saw a post on the XSI...

you are a gentleman and a scholar, and your looks are only exceeded by mine.

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02-06-2008 03:22 PM  10 years agoPost 7
HawkEyeMedia

rrApprentice

Fort Worth, Texas

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I also fabricated a new carbon fiber yoke assembly. The plastic is too flexible to be cantilivered with very much weight. I now use bronze inserts for the bearing surfaces with 3/8" aluminum shafts for the axles. I use a drill press to make sure the holes for the bronze inserts are in alignment so there's no binding when the cradle is tilted up and down.

It's also very important that the cg of the camera is perfectly balanced on the tilt axis, and that the main yoke is perfectly balanced, especially if you're going to use the 401 gyros for stabilization. If not, the axis will always drift to the heavy side.

Mark LaBoyteaux
HawkEyeMedia.com

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02-07-2008 05:40 PM  10 years agoPost 8
vrwired

rrVeteran

Boulder County, CO

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ron g
Yeah.. the XSI looks awesome.. The fact the it has "live mode" so that it can focus without moving the mirror! Some kind of new AF contrast focus while in live view... Although infinity focus is all I need in the air.

I cant wait utill april for the XSI.. I need a cam now.. so it will either be the XTI or the Canon 40D.

thing about the 40D is i can use live view (no ccd) and also trigger it with an e-switch.. Just a bit heavy, but my GSR shouldnt balk at it.

I really am not wanting to use a ccd... maybe its me.. just doesnt seem as elegant a solution. Someone prove me wrong.

But anyway.. Meanwhile I am going to be meesing with my Mark IV mount trying to chase down some tightness and binding... works fine on the most part.. just needs a little tlc.

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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02-07-2008 05:57 PM  10 years agoPost 9
aambrose

rrElite Veteran

Pana, IL

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HawkEyeMedia.... I know you know alot about this mount.
It was named after him. He designed it and did most if not all of the R&D. Mark has a wealth of information and ingenuity! Oh yeah, he's a nice guy too.
I really am not wanting to use a ccd... maybe its me.. just doesnt seem as elegant a solution. Someone prove me wrong.
We've been using this method for over 3 years and it works well for us. The only cons (if you want to call them that) are some slight cropping of the view on the ground monitor, having to make sure the CCD lens is aligned properly in the eyecup prior to takeoff, and a few extra grams of weight. Other than that, it has worked just fine.


Tony

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02-07-2008 06:23 PM  10 years agoPost 10
vrwired

rrVeteran

Boulder County, CO

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aambrose..
Yeah I know it is named afer him and his design.. heh funny... Thats why I said "I know you know a lot about this mount"

Yeah .. I am sure I would be fine with just the ccd.. I know many people are perfectly happy with it.. It's just one more thing though to me.. There are already so many different variables in my AP setup.. I'm just trying to keep things simple!

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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02-07-2008 06:44 PM  10 years agoPost 11
aambrose

rrElite Veteran

Pana, IL

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Thats why I said "I know you know a lot about this mount"
Another drawback of forums - no voice inflection or facial gestures -- just smilies.
I'm just trying to keep things simple!
Hey, I can't blame you for that!


Tony

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