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An autofocus question
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Mar 4, 2016 09:23:56   #
camerapapi Loc: Miami, Fl.
 
To my eyes focus is very good in both of them.

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Mar 4, 2016 10:10:02   #
JCam Loc: MD Eastern Shore
 
DerBiermeister wrote:
For a relatively closeup shot of an encased model, the question is: does autofocus target the clear Optix acrylic window, or does it "see through it" and focus on the actual model itself -- the center of which would be around 7" deeper?

The first pic was done with autofocus - the second manual.


I think your second photo is VERY marginally sharper; I'm using the main mast burgee as a check point. I've done some photos through case glass, but I'm no expert. However, I find it best to take the pictures at a slight angle; frequently it will eliminate unwanted reflections.

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Mar 4, 2016 10:11:06   #
John_F Loc: Minneapolis, MN
 
What was the name of the ship?

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Mar 4, 2016 11:06:48   #
bcrawf
 
Bultaco wrote:
Can changing focus modes increase or decrease lighting, photo 2 is lighter than 1. I just don't understand, would someone please explain.

Thanks


The framing of the two images differs such that one includes less of the lighter part and more of the darker (bottom) part of the view. The exposure changed in response. The focus was not a factor.

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Mar 4, 2016 12:25:31   #
Psergel Loc: New Mexico
 
John_F wrote:
What was the name of the ship?


The plaque says "HMAV Bounty" (also known as HMS Bounty) of Captain Bligh/Fletcher Christian fame.

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Mar 4, 2016 13:20:05   #
paulrph1 Loc: Washington, Utah
 
DerBiermeister wrote:
For a relatively closeup shot of an encased model, the question is: does autofocus target the clear Optix acrylic window, or does it "see through it" and focus on the actual model itself -- the center of which would be around 7" deeper?

The first pic was done with autofocus - the second manual.


For a test here is what to do. Mount the camera a tripod and manually focus then switch to auto focus and push the shutter half way down and see it the lens moves, just a trifle. There you have your answer. Do it several times to be sure.

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Mar 4, 2016 14:50:20   #
speters Loc: Grangeville/Idaho
 
DerBiermeister wrote:
For a relatively closeup shot of an encased model, the question is: does autofocus target the clear Optix acrylic window, or does it "see through it" and focus on the actual model itself -- the center of which would be around 7" deeper?

The first pic was done with autofocus - the second manual.

It will definitely focus on the target an not on the acrylic, because there is no contrast in the acrylic (nothing to focus on)!

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Mar 4, 2016 16:04:28   #
Dick Z. Loc: Downers Grove IL
 
haroldross wrote:
Both. It will try to find the best contrast. Manual focus is an easy fix in this situation.



:thumbup: :thumbup: :thumbup: :thumbup:

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Mar 4, 2016 23:59:52   #
farnsworth52 Loc: W. Pa.
 
Manual with f8 or higher focus on the bottom of the frame and lock focus then shoot

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Mar 5, 2016 05:32:08   #
joto9d7 Loc: Laguna Hills
 
What i learned about shooting zoo animals through glass is that to avoid reflection, shoot very close to the glass.

Use manual focus because you do not want your camera to focus on a blemish or scratch on the glass, but on the ship.

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Mar 5, 2016 10:47:24   #
DerBiermeister Loc: North of Richmond VA
 
Psergel wrote:
The plaque says "HMAV Bounty" (also known as HMS Bounty) of Captain Bligh/Fletcher Christian fame.


Correct

I've done a ton research on the Bounty and her story. While commonly known today as HMS Bounty, she was not a true "ship of the line" and back then most probably referred to as HMAV (His Majesty's Armed Vessel). There is some dispute as to the exact year that her keel was laid as the merchant ship Bethia -- 1782? 1783?
In 1787, the Royal Navy purchased, refitted, and armed her (4 four-pounder cannon, and 10 culverin guns) and she was commissioned HMAV Bounty in August. At the same time, Bligh was given the command to sail her to Otaheite (today called Tahiti) in search of breadfruit to hopefully be a food source for African slaves working in the Caribbean plantations. After weeks of agonizing delay, he finally departed Portsmouth on December 23 on the ill-fated voyage.

It is my belief that the initial delay compounded the whole chronology and was the root cause for the munity many months later. It meant that when the Bounty arrived at Cape Horn, they had missed the favorable time of the year to round the Horn, and instead battled it for one month in the most tempestuous conditions ever, only to have to give up, reverse course to the Cape Of Good Hope adding some 10,000 additional miles to the voyage.

The delay off Cape Horn led to a five-month delay in Tahiti during which time they had missed the ideal transplanting time of the breadfruit and subsequently had to wait for the trees to mature enough to transport. Over this period, naval discipline began to break down as the crew took native wives and enjoyed unparalleled freedoms. No wonder that they mutinied several weeks later once at sea.

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