I understand the DOF/image size issue but long lens has shallow "appearance
DOF", even the calculated DOF are the same the longer lens give softer
background. So I have mentioned you need to stop down for the DOF. Stopping
down the short lens will give harsh background while the long lens still
maintain a soft one.
With the test I just made, I found a strange thing, looking at the edge of
the can the 300mm give sharper image with similar magnification and same
aperture. I have double checked the aperture and focus point and focus was
done by liveview very carefully. It seems that DOF cannot be governed by a
simple formula.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> We are both wrong. I had forgotten that maintaining the same image size
> means that the DOF will be identical in both shots since the 300mm shot
> needs to be taken from 6 times the distance.
>
> Chuck Norcutt
>
> On 8/30/2011 10:32 PM, C.H.Ling wrote:
>> To maintain a soft OOF background and greater DOF one should use a very
>> long
>> focal length lens, say 300-500mm and stop down.
>>
>> This one is taken with OM 50/3.5 at F5.6
>>
>> http://www.accura.com.hk/temp/IMG_3507.JPG
>>
>> This one is taken with OM 300/4.5 at F5.6
>>
>> http://www.accura.com.hk/temp/IMG_3510.JPG
>>
>> C.H.Ling
>>
>> ----- Original Message -----
>> From: "Chuck Norcutt"<chucknorcutt@xxxxxxxxxxxxxxxx>
>>
>>
>>> Another beauty but I've been asking myself if you can't achieve the same
>>> result in a single image with a shorter focal length lens.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> On 8/30/2011 6:00 PM, usher99@xxxxxxx wrote:
>>>> Very careful stack of 7 images. The standard stack routine had great
>>>> difficulty with the distal part of the flower--especially on the right.
>>>> There are alt stacking routines that might have done better
>>>> especially
>>>> the "soft stack" that is purported to deal better with highlights.
>>>> The individual images looked spot on to me. Spent 45min cloning out
>>>> halos/artifacts.
>>>>
>>>>
>>>> http://tinyurl.com/42dx7be
>>>>
>>>>
>>>> Slowly keepin on stackin, Mike
>>
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