Leica to EOS adapter issue

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Archive 2008 · Leica to EOS adapter issue

mark1958
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p.1 #1 · Leica to EOS adapter issue

I have a Leica 28mm R lens (square hood attached-latest version). When i use on the 1DsmkIII or 5DII with a happyhk autofocus confirming adapter, I get significant moire (with the right light and subject). I have some other adapters that are not chipped and do not get moire with the same shot. However, for wide angle, I have trouble getting tack on target focusing (depending on the subject). I just wondered if anyone has found a chipped Leica to EOS adapter that might get around my moire issue. Thanks in advance.

Dec 21, 2008 at 08:40 PM

mark1958
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p.1 #2 · Leica to EOS adapter issue

Here is an example with the 1DsmkIII and 28mm R earlier this year. First is the full image resized and then 100% crop

2012 © mark1958

Dec 21, 2008 at 08:53 PM

HansenTsang
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p.1 #3 · Leica to EOS adapter issue

Why do you think moire pattern has anything to do with your adapter? Moire pattern from my understanding is a function of the digital sensor. If you are talking about the moire pattern on the shirt, you are really pixel peeping. How big do you plan to print the image so you can actually see the pattern?

The focusing problem is a function of the adapter. The AF confirm chip can only give you a range of focus that is deemed tolerable. It is quite difficult to get tack sharp focus with just the chip unless you are lucky. I suggest trying different method of manual focus like a split prism focus screen.

Dec 21, 2008 at 09:28 PM

Andi Dietrich
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p.1 #4 · Leica to EOS adapter issue

This is not an adapter problem. Your focus is probably not spot on without the AF confirm chip adapter so the image is slightly blured.

What you can do is this: use a longer shutter speed, like 1/30 handheld, stop down to f22, shoot the same image several times and defocus at least one image a bit, this gives you the possibility to fix it in post

All this reduces sharpness similarly to an AA filter

PS: maybe you just dont see it when the image is reduced to normal print size

Dec 21, 2008 at 09:33 PM

Alex
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p.1 #5 · Leica to EOS adapter issue

As others say when you see moire your focus is spot on. All you can do is to get a less sharp lens

Alex

Dec 21, 2008 at 09:54 PM

kosmoskatten
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p.1 #6 · Leica to EOS adapter issue

Mark: I agree with the previous postings, moiré is not the lens itself being faulty. I have had som freaking moiré happening with my 5D and at one time I managed to introduce moiré to some blinds on a building and that made them look like they were mounted sideways...
...looked funny enough.

Dec 21, 2008 at 10:00 PM

mark1958
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p.1 #7 · Leica to EOS adapter issue

I was concerned that it was an issue of being right on focus with the AF confirmation and being slightly out of focus with manual focus. I had another example that was even more apparent but I do not have the files with me. Nonetheless, I did different MF attempts and could not reproduce the effect with the other two adapters even though focus was spot on. I think the thickness of the adapter vs the high resolution of the digital sensor might be having an effect. I may try using my Angle C viewfinder where i can get a magnified focus point with the three different adapters I own.

Dec 21, 2008 at 10:01 PM

mark1958
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p.1 #8 · Leica to EOS adapter issue

I am not stating the lens is the problem. I am stating the combination of the lens, adapter, and high resolution sensor is the problem.

kosmoskatten wrote:
Mark: I agree with the previous postings, moiré is not the lens itself being faulty. I have had som freaking moiré happening with my 5D and at one time I managed to introduce moiré to some blinds on a building and that made them look like they were mounted sideways...
...looked funny enough.

Dec 21, 2008 at 10:03 PM

jjlphoto
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p.1 #9 · Leica to EOS adapter issue

Mark- I agree with the others. I believe that lens is of the "floating element" design, meaning exact placement (or flange to film registration) is critical to achieve its top design performance. Congratulate yourself on a perfect adapter!

Dec 21, 2008 at 10:09 PM

mark1958
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p.1 #10 · Leica to EOS adapter issue

John.. Yes perhaps this is the explanation. I wonder if this was observed on the DMR?

Dec 21, 2008 at 10:13 PM

Steve Spencer
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p.1 #11 · Leica to EOS adapter issue

Hi Mark,

I have heard people mention occasional moire problems with this lens and the DMR, but that probably isn't that surprising given that the DMR has no anti-aliasing filter.

Dec 21, 2008 at 11:28 PM

HansenTsang
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p.1 #12 · Leica to EOS adapter issue

If you think that your AF is spot on and MF is slightly off you have to do a focus test on a tripod and see if you need to shim your focus screen with different thickness washers.

Dec 21, 2008 at 11:52 PM

pdmphoto
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p.1 #13 · Leica to EOS adapter issue

Mark,

Be happy you are seeing moire, its a sign that your lens is sharp - performing above the Nyquist limit of the sensor. Most other Canon DSLR's have lower resolution, but a very strong AA filter to remove the moire (and some edge acutance). It's nice to know that Canon didn't overdue the AA filter effect on the 1DsIII.

Of course, moire can also be a function of your RAW converter. Some are better than others at minimizing its effect. Since you are using the same PP for the lens and various adapters, that would suggest the Happypage adapter is performing the best.

Dec 22, 2008 at 03:43 AM

Grant808
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p.1 #14 · Leica to EOS adapter issue

Alex wrote:
As others say when you see moire your focus is spot on. All you can do is to get a less sharp lens

Alex

This is the right answer! You need to have things in focus to get this type of moire!
Nothing is wrong with your adapter or the combo.

Good news for me too about the 5DII...it means the AA filter is not too intrusive.

Dec 22, 2008 at 10:42 PM

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