Tamron at 600mm & Focus: I took a photo at 600mm with the Tamron and D7000 on AF Do I need to work on focus ? Sarge69...

sarge69 Loc: Ft Myers, FL

I took a photo at 600mm with the Tamron and D7000 on AF

Do I need to work on focus ?

Sarge69

Photo viewed at 18%

Photo viewed at 52%

Photo viewed at 100%

Don L G

sarge69 wrote:

I took a photo at 600mm with the Tamron and D7000 on AF

Do I need to work on focus ?

Sarge69

Looks good Sarge. But what F stop.

janw034 Loc: Paso Robles, CA

I don't know if this will help you or not, but I used the manual focus on the lens first and then hold down the shutter button half way to continue focus and then shoot. I had put a post up on this recently. Hope that helps. So now I always manual focus on something first and then shoot.

MT Shooter Loc: Montana

sarge69 wrote:

I took a photo at 600mm with the Tamron and D7000 on AF

Do I need to work on focus ?

Sarge69

I would suggest checking out the AF Fine Tune feature of your D7000, the lens may need to be tuned to your body for optimum results.

sarge69 Loc: Ft Myers, FL

MT Shooter wrote:

I would suggest checking out the AF Fine Tune feature of your D7000, the lens may need to be tuned to your body for optimum results.

That's my next project. One other owner said he had to adjust a bit. I'll do it on a similar subject not moving at adjust by negative 5's to -20 and then positive 5's to +20 and check them out.

Thanks for all the comments folks.

Sarge69

sarge69 Loc: Ft Myers, FL

Don L G wrote:

Looks good Sarge. But what F stop.

I'm fairly sure it was F9 but I'll go check

Sarge69

MT Shooter Loc: Montana

sarge69 wrote:

That's my next project. One other owner said he had to adjust a bit. I'll do it on a similar subject not moving at adjust by negative 5's to -20 and then positive 5's to +20 and check them out.

Thanks for all the comments folks.

Sarge69

Just find a yardstick, place it at 45 degrees to the lens at around 30 feet away. Shoot at 600mm and wide open with spot AF on the very center of the yardstick. A close look at the image will show whether or not the lens is back-focusing or front-focusing and adjustments are very easy to make from there. You should have a balanced DOF. (Meaning that if you focus on 18", then your DOF should have 17" to 19" well in focus)

sarge69 Loc: Ft Myers, FL

Don L G wrote:

Looks good Sarge. But what F stop.

Info from EXIF was F9 and shutter 1250th

Maybe another test on varying F stops to find sweet spot?

Sarge69

Don L G

MT Shooter wrote:

Just find a yardstick, place it at 45 degrees to the lens at around 30 feet away. Shoot at 600mm and wide open with spot AF on the very center of the yardstick. A close look at the image will show whether or not the lens is back-focusing or front-focusing and adjustments are very easy to make from there. You should have a balanced DOF. (Meaning that if you focus on 18", then your DOF should have 17" to 19" well in focus)

Will the 150-600 focus at 18" ??

MT Shooter Loc: Montana

Don L G wrote:

Will the 150-600 focus at 18" ??

If its 30 feet away it will.
Please re-read the post.

Don L G

sarge69 wrote:

Info from EXIF was F9 and shutter 1250th

Maybe another test on varying F stops to find sweet spot?

Sarge69

Probably real close. I don't have the Tamron I have the Sigma 150-500mm and the sweet spot is f8.

Don L G

MT Shooter wrote:

If its 30 feet away it will.
Please re-read the post.

Not real clear. You meant forces on the 18" mark on the ruler.

SonnyE Loc: Communist California, USA

My opinion would be yes.
I think you might be able to get it sharper.

I'm watching for anything to do with a Tamron 150-600mm because I have one on back order. :?

MT Shooter Loc: Montana

Don L G wrote:

Not real clear. You meant forces on the 18" mark on the ruler.

Quote:

(Meaning that if you focus on 18", then your DOF should have 17" to 19" well in focus)

Not sure how I can make that statement any clearer.

Don L G

MT Shooter wrote:

Not sure how I can make that statement any clearer.

No disrespect meant. Just the way my simple mind works.