Back focus

[Timur Civan]

Anyone know how to adjust the back focus on the TI PL ? All my lenses are off by about a foot.

 

[Paul Ellington]

The hole on the top near the right of the top of the camera. A wrench came to adjust your back focus. Use a chart downloaded from internet if you don't have a redfocus

 

[Trevor Meeks]

You will need to remove a "plug" from inside the hole before you can adjust the backfocus screw.

All of my lenses seem to be off as well. Guess it's time to bust out the chart and get it as close as I can. Any other tips on getting a good accurate backfocus adjustment?

 

[Trevor Meeks]

BTW backfocus adjustment is covered on page 221 and 222 of the scarlet ops guide.

 

[Paul Ellington]

Each lens is different, brands particualarly. Make sure you double check when switching a lot. I have the red focus which is amazing because you can go to 2k or 1k and really make sure you have focus. Same thing would apply to a chart with the cropping. I would highly recommend the bomb evf at some point. Super sharp and it's kinda works as an additional check and balance. I am always checking to make sure I have a sharp image.

 

[Mike Garrick]

Can someone please provide a link to a GOOD & PROVEN downloadable back focus chart off the web. Thanx

 

[Paul Ellington]

Can someone please provide a link to a GOOD & PROVEN downloadable back focus chart off the web. Thanx

http://www.panavision.co.uk/pdf/downloads/charts/small-siemen-starts-chart.pdf

 

[Trevor Meeks]

Or http://www.bealecorner.org/red/test-patterns/star-chart-bars-full-600dpi.png

 

[Mike Garrick]

Thanks Guys for the super fast reply. Just one more reason to frequent this site.

 

[SUNILPREM]

http://www.panavision.co.uk/pdf/downloads/charts/small-siemen-starts-chart.pdf

Thank you very much

 

[SUNILPREM]

Or http://www.bealecorner.org/red/test-patterns/star-chart-bars-full-600dpi.png

Thanks

 

[Brandon J.F.]

Can someone post how to check and fix this, step by step, with one of these charts?

 

[Lliam Worthington]

+1

That would be a great post guys if someone can spare the time.

Thanks

Lliam

 

[Douglas Underdahl]

Well, here's how to do it with the Red One, a chart, and a wide angle lens:

http://www.youtube.com/watch?v=IhmolBMtDzg

Don't forget to watch the second video, too.

Would be the same with Epic but you use the tool on the screw on top of the camera instead of rotating the collar.

57,000 hits since 2008!

 

[Lliam Worthington]

Thanks very much Doug. 57K's not bad at all, especially considering there is not even so much as whicker of an amusing cat to be seen.

Best

Lliam

 

[Paul Ellington]

Just be careful to not strip the unit. Otherwise you have to send in to RED.

 

[Douglas Underdahl]

I was going to have my cat do the demonstration but his agent said no . . .

 

[Mike Garrick]

@ Douglas, I'm assuming then he would be the OMG B.F cat ....right.

 

[Thommes Ulfeng]

Thx for a great thread.

I have a question out of the ordinary.

Minolta MD MC mounts have 0,5mm shorter flange distance than an eos mount. It seems like the backfocus adjustment is able to compensate for that 0,5 mm with an MD MC adapter ring that is minimally changing flange depth of the eos mount. I am getting focus to infinity on my minolta lenses in this way. The adapter ring makes the lenses sit rock solid with RED eos mount.

Is it possible to adjust the backfocus too far? In other words could threads be wound out of the "nut" they are sitting in? (sorry my thech english is so so)

I know there is a hard stop adjusting backfocus in one direction, which can be easily felt with a gentle hand. But I have not dared to go far in the opposite direction.

Anyone with experience on this? Input much appreciated. Thx.

Thmmes

 

[Ryan De Franco]

Sounds like a call for Red Tech support they'll be able to tell you the tolerances.... .5 mm is probably moving towards the edge of the range but I could be totally wrong....

good luck!