SEARCH FINESCALE.COM

Enter keywords or a search phrase below:

Why manual focus

2898 views
9 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Why manual focus
Posted by Don Stauffer on Monday, March 23, 2015 9:50 AM

I tried to grab a quick shot of a model engine for a thread on the aircraft forum this morning.  I don't think the picture is too horrible, but it is certainly out of focus.  I used autofocus and I should have known better- the autofocus algorithms in most cameras just cannot handle macro stuff- I should have used manual focus and focused on a plane further back.  The rule of thumb I and many others use in macro is 1/3 of way between front and rear extent of detail.  I just wanted to use flash for a quick pic, so used automatic and let it pick aperture.  If this were an important shot I would have brought down model off wall so I could use tripod and extreme f/# with long exposure.  So this is why I like DSLR. If I do manual focus I need enough resolution in viewfinder to get a good view of focus.  Few electronic viewfinders I have seen can do this- they are made primarily for framing and autofocus.

Don Stauffer in Minnesota

  • Member since
    October 2007
  • From: Scotland
Posted by Milairjunkie on Monday, March 23, 2015 10:53 AM

Does Canon Live View not do this - I've been hankering after a Live View model for a while now so that I can tether it to a laptop for accurate pre-shot previews.

I think Nikon has a similar feature.

  • Member since
    February 2011
  • From: St louis
Posted by Raualduke on Monday, March 23, 2015 3:19 PM

Don, maybe my eyes are going, but I don't see anything out of focus.

  • Member since
    October 2007
  • From: Louisville, KY
Posted by pordoi on Monday, March 23, 2015 3:37 PM

Doesn't look like the subject was shot head on, but from an oblique angle.  Seems more like a depth of field issue don't you think?...  with the near cylinders in focus and the far ones a bit out.

Don

  • Member since
    February 2015
Posted by Bick on Monday, March 23, 2015 5:18 PM

Don,

Nice build!! DOF aside, I think your pic shows what you, likely, wanted to show. I think you could up tthe ISO and the f stop to get greater depth with auto flash if you wanted. Your Nikon does well at high ISO IIRC.These old eyes of mine have difficulty with manual focus so I use autofocus almost exclusively - macro or not

  • Member since
    December 2011
Posted by Chrisk-k on Monday, March 23, 2015 9:36 PM

Raualduke

Don, maybe my eyes are going, but I don't see anything out of focus.

 

Same here. The photo looks sharp to me.

Iwata HP-CS | Iwata HP-CR | Iwata HP-M2 | H&S Evolution | Iwata Smart Jet + Sparmax Tank

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Tuesday, March 24, 2015 9:32 AM

pordoi

Doesn't look like the subject was shot head on, but from an oblique angle.  Seems more like a depth of field issue don't you think?...  with the near cylinders in focus and the far ones a bit out.

Don

Yep, it was shot oblique- it is mounted on the wall above my head, and I was't going to bring a ladder up to my den.  Yes, the obliqueness does increase the depth of field, but helps exaggerate the problem.

BTW, on the live view issue, I know of no live view cameras that have a pixel count on their electronic display anywhere near as high as the camera chip itself- that is the problem.

Don Stauffer in Minnesota

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, March 25, 2015 8:56 AM

Okay, here is a shot using manual focus.  I also used aperture priority, and flash.  I think you can readily see the differences comparing it to the original photo.

Click on the photo in the post  to see an enlarged view.

Don Stauffer in Minnesota

  • Member since
    October 2007
  • From: Scotland
Posted by Milairjunkie on Wednesday, March 25, 2015 9:24 AM

That does look far improved.

It look like auto was focusing on the front of the prop & loosing much of the detail, whereas manual focus is more central over the depth & giving a better overall result.

Regardless of resolution (1024 x 680 on some Canon's) I'm still pretty sure that live view would have highlighted this? 

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, March 26, 2015 9:32 AM

That is it exactly!

Don Stauffer in Minnesota

JOIN OUR COMMUNITY!

Our community is FREE to join. To participate you must either login or register for an account.

SEARCH FORUMS
FREE NEWSLETTER
By signing up you may also receive reader surveys and occasional special offers. We do not sell, rent or trade our email lists. View our Privacy Policy.