X-Pro1 + Metabones Speed Booster + Nikon 15/3.5 Ais

Started 4 months ago | Discussions thread
nikon201068
Forum MemberPosts: 94
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Re: Jared and Dan: donut defocused zones test
In reply to Jared Huntr, 4 months ago

Jared Huntr wrote:

Zagato wrote:

Jared Huntr wrote:

Miki Nemeth wrote:

nikon201068 wrote:

Jared Huntr wrote:

If you look at the pic at 100%, there seemed to be radial out of focus zones. For example, place an imaginary donut on the image. The part covered by the donut are soft and other parts sharp. So working your way out from the center, it starts out sharp, then soft, then sharp again, fnishing with soft corners.

I noticed that too.

Hi Jared and Dan, Here is my challenge: three similar shots one with Speed Booster, another one with regular high-quality adapter, and one with a special adapter containing a glass element.

Can you detect the phenomenon on any of them?

Take care and thank You, Miki

It appears that the first one is the sharpest and cleanest up to the corners and edges.

The second is quite blurry in the corners.

The third is much better than the second, but has a tiny bit of blur in the lower corners.

My guess is

1=adapter with no glass:

http://3.static.img-dpreview.com/files/p/E~forums/54247837/02833cc00a4e47a4b3b7867eb802f38f

2=adapter with glass element (based on the assumption that no-name = cheaper quality):

http://2.static.img-dpreview.com/files/p/E~forums/54247837/67981752dfe748b3994beaf0f7049891

3=speed booster:

http://3.static.img-dpreview.com/files/p/E~forums/54247837/872f1260cd80437ab835a39704c5f2cb

These appear to be from a longer lens. I believe distortions and wavy field curvature issues would be more visible in shots taken with wide angle lenses.

Jared,

I think I could live with the slight blur on the edges in #3 (Speedbooster).

Brgds
Michael (Vienna)

Yes, I would be ok with this as well. However, the image in this thread from the OP seems to indicate a more serious issue with wide angle focal lengths.

Jared,

I think you might be right about it being more serious with the wide angle than longer focal lengths.

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