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Author Topic: New Mamiya 28mm f4.5 AFD lens  (Read 11119 times)
HarperPhotos
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« on: December 28, 2007, 04:02:54 PM »
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Hello,

I've just purchased the new Mamiya 645 AF 28mm f4.5D lens and I think I have bought a lemon.

As I am on holiday I have taken these images by my pool.

I think it is very obverses the in the bottom left and right corners it looks pretty soft.

I personally think that when you spend close to 7 grand in NZ dollars a lens like this should be sharp?

Mamiya claim in the adverting that this lens is superior edge to edge?

So here are the states on the images:

Mamiya 645AFDII and Leaf Aptus75 back.

I focused on the fountain in the kiddies pool with the camera on a tripod and I shot mirror up with a electron cable.

Images processed in Adobe bridge with no shaping.

I look forward to reading every one's opinions.

Simon
Harper Photographics  Limited

Email  : simon@harperphoto.co.nz
Website:  http://www.harperphoto.com

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« Last Edit: December 28, 2007, 04:06:08 PM by HarperPhotos » Logged

Simon Harper
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« Reply #1 on: December 28, 2007, 04:59:05 PM »
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it looks bad ( the edges ) , although not knowing the 28mm mamiya.
for sure inferior than the 35mm contax  and not comparable to the 28HR, both i use.

i would not be surprised if you have a lemon. sample variation is so high this days from nearly all manufactors ....
« Last Edit: December 28, 2007, 05:23:25 PM by rainer_v » Logged

rainer viertlbŲck
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« Reply #2 on: December 28, 2007, 05:03:20 PM »
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it looks bad, although not knowing the 28mm mamiya.
for sure inferior than the 35mm contax  and not comparable to the 28HR, both i use.

i would not be surprised if you have a lemon. sample variation is so high this days from nearly all manufactors ....
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Hello,

My Mamiya AF 35mm lens is shaper than this 28mm.

Simon
« Last Edit: December 28, 2007, 05:07:05 PM by HarperPhotos » Logged

Simon Harper
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Bill Caulfeild-Browne
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« Reply #3 on: December 28, 2007, 05:14:04 PM »
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Hello,

I've just purchased the new Mamiya 645 AF 28mm f4.5D lens and I think I have bought a lemon.

As I am on holiday I have taken these images by my pool.

I think it is very obverses the in the bottom left and right corners it looks pretty soft.

I personally think that when you spend close to 7 grand in NZ dollars a lens like this should be sharp?

Mamiya claim in the adverting that this lens is superior edge to edge?

So here are the states on the images:

Mamiya 645AFDII and Leaf Aptus75 back.

I focused on the fountain in the kiddies pool with the camera on a tripod and I shot mirror up with a electron cable.

Images processed in Adobe bridge with no shaping.

I look forward to reading every one's opinions.

Simon
Harper Photographics  Limited

Email  : simon@harperphoto.co.nz
Website:  http://www.harperphoto.com

Phone        : +64 9 444 1148
Fax            : +64 9 444  1148
Mobile       : +64 29 444 1148
[a href=\"index.php?act=findpost&pid=163664\"][{POST_SNAPBACK}][/a]

I find it very hard to judge sharpness from your files on my screen - but I will suggest that stops smaller than f11 will suffer from diffraction softening. I'd ignore the f32 file for sure, and the f16 will be questionable.

My own 28 mm is best at f11 where it is very sharp. In fact, if I need to use my 35 mm, I find it's almost better to use the 28 mm and crop the image!

May I suggest you try f5.6, 8 and 11. It might be useful to compare with your next-widest lens and compare the areas they both cover.

Bill
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HarperPhotos
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« Reply #4 on: December 28, 2007, 09:46:26 PM »
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I find it very hard to judge sharpness from your files on my screen - but I will suggest that stops smaller than f11 will suffer from diffraction softening. I'd ignore the f32 file for sure, and the f16 will be questionable.

My own 28 mm is best at f11 where it is very sharp. In fact, if I need to use my 35 mm, I find it's almost better to use the 28 mm and crop the image!

May I suggest you try f5.6, 8 and 11. It might be useful to compare with your next-widest lens and compare the areas they both cover.

Bill
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Hi Bill,

I hear what you are saying but I still think a Lens of this calibre is very much lacking in bottom corner resolution in any f stop.

I did take some test shots at the same time with my Mamiya 35mm AF lens and I think you have to agree it is definitely sharper in the corners.

Regards

Simon

Website:  [a href=\"http://www.harperphoto.com]http://www.harperphoto.com[/url]
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Simon Harper
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tonypassera
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« Reply #5 on: December 28, 2007, 10:07:28 PM »
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Hello,

I've just purchased the new Mamiya 645 AF 28mm f4.5D lens and I think I have bought a lemon.

As I am on holiday I have taken these images by my pool.

I think it is very obverses the in the bottom left and right corners it looks pretty soft.

I personally think that when you spend close to 7 grand in NZ dollars a lens like this should be sharp?

Mamiya claim in the adverting that this lens is superior edge to edge?

So here are the states on the images:

Mamiya 645AFDII and Leaf Aptus75 back.

I focused on the fountain in the kiddies pool with the camera on a tripod and I shot mirror up with a electron cable.

Images processed in Adobe bridge with no shaping.

I look forward to reading every one's opinions.

Simon
Harper Photographics  Limited

Email  : simon@harperphoto.co.nz
Website:  http://www.harperphoto.com

Phone        : +64 9 444 1148
Fax            : +64 9 444  1148
Mobile       : +64 29 444 1148
[a href=\"index.php?act=findpost&pid=163664\"][{POST_SNAPBACK}][/a]

I have a contax 35mm that is significantly sharper in the corners.
I think you have good reason to return your 28mm and
ask for another sample.  Even if yours is within
Mamiya's QA tolerances,  i'd swap it until i had one
that i was happy with.  As you say, for that amount
of money, you should get stellar performance.

Good luck,
Tony
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Prakash Patel
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« Reply #6 on: December 29, 2007, 12:27:33 AM »
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Hi Bill,

I hear what you are saying but I still think a Lens of this calibre is very much lacking in bottom corner resolution in any f stop.

I did take some test shots at the same time with my Mamiya 35mm AF lens and I think you have to agree it is definitely sharper in the corners.

Regards

Simon

Website:  http://www.harperphoto.com
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Simon

Something seems to be wacky...............this 35mm lens shot @f11 and focused on the fountain of the kiddie pool, seems to be front focusing. At that fstop the chairs on the right should definately be sharp. Did you manual focus or did the autofocus have to hunt and peck for the little fountain?
The previous 28mm shots seem to exhibit the same...........the wide open shot looks out of focus on the fountain (it may in fact be a lemon)  It is hard to tell from these jpegs if your camera is focusing properly.......perhaps adding to this issue may also be that you are not using any sharpening. Do you typically send out images processed in ACR with no sharpening?
Test your 35 lens wide open to confirm that what is in focus in the viewfinder is in fact what the sensor sees.
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david o
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« Reply #7 on: December 29, 2007, 01:11:07 AM »
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the only sample I have myself of the 35mm was made on film and scanned not even high rez. but if that can help...
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« Reply #8 on: December 29, 2007, 01:11:56 AM »
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« Last Edit: December 30, 2007, 01:53:47 PM by david olivier » Logged
HarperPhotos
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« Reply #9 on: December 29, 2007, 02:27:28 PM »
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the only sample I have myself of the 35mm was made on film and scanned not even high rez. but if that can help...
BTW no crop so the "all" lens was use.
look at the bottom you'll see the fabric and again not a good scan
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Good Morning,



Thanks for the feedback.

I've taken some more test images this morning of the fountain in my drive way.

Again the camera was on a tripod and I shot with the mirror up with a electron cable. I focused both lens using the AF and switched them to manual so they were locked.

I processed them in Adobe bridge and there is no shaping. I wanted to keep them as pure as possible.

I think it pretty apparent that the bottom left and right corners a soft.

I also use my 35mm as a compassion and it is clearly shaper in the corners

Can any one who also owns a Mamiya AF 28mm f4.5D lens please have a look at these test shots and can tell me if there lens has the softness in the bottom corners.

So when I go back to Mamiya Japan I have some backup from other photographers who have this lens

 look forward to your thoughts

Regards

Simon
« Last Edit: December 29, 2007, 03:24:54 PM by HarperPhotos » Logged

Simon Harper
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« Reply #10 on: December 29, 2007, 05:18:51 PM »
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Good Morning,
Thanks for the feedback.

I've taken some more test images this morning of the fountain in my drive way.

Again the camera was on a tripod and I shot with the mirror up with a electron cable. I focused both lens using the AF and switched them to manual so they were locked.

I processed them in Adobe bridge and there is no shaping. I wanted to keep them as pure as possible.

I think it pretty apparent that the bottom left and right corners a soft.

I also use my 35mm as a compassion and it is clearly shaper in the corners

Can any one who also owns a Mamiya AF 28mm f4.5D lens please have a look at these test shots and can tell me if there lens has the softness in the bottom corners.

So when I go back to Mamiya Japan I have some backup from other photographers who have this lens

 look forward to your thoughts

Regards

Simon
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HI
You should email Peter Eastway in Sydney as he has this lens with the P45+ & loves it for his landscapes. He publishes Better Photography & does beautiful landscapes.
Thanks Denis
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Denis Montalbetti
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« Reply #11 on: December 29, 2007, 05:38:46 PM »
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HI
You should email Peter Eastway in Sydney as he has this lens with the P45+ & loves it for his landscapes. He publishes Better Photography & does beautiful landscapes.
Thanks Denis
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Hi Denis,

Thanks very much, I just had a look at his website and you are right amazing shots. Unfortunately he doesn't have a email address.

Simon
« Last Edit: December 29, 2007, 05:39:32 PM by HarperPhotos » Logged

Simon Harper
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« Reply #12 on: December 29, 2007, 06:30:09 PM »
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eastway@betterphotography.com
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Willem Rethmeier
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« Reply #13 on: December 29, 2007, 06:30:26 PM »
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Hi Denis,

Thanks very much, I just had a look at his website and you are right amazing shots. Unfortunately he doesn't have a email address.

Simon
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hi fellow kiwi,

yeah, the sharpness is a bit dodgey on the bottom right hand side. when i first looked, i thought maybe you dont have enough dof, but the bottom middle is sharp, then gradually turns to mush on the bottom right.

did you buy it from panavision? you should send it back.

paul
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« Reply #14 on: December 29, 2007, 06:32:01 PM »
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Hi Denis,

Thanks very much, I just had a look at his website and you are right amazing shots. Unfortunately he doesn't have a email address.

Simon
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Sure he does:

eastway@betterphotography.com
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« Reply #15 on: December 29, 2007, 06:34:37 PM »
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Nick I beat you to it!
Cheers,
Willem.
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Willem Rethmeier
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« Reply #16 on: December 29, 2007, 06:45:18 PM »
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hi fellow kiwi,

yeah, the sharpness is a bit dodgey on the bottom right hand side. when i first looked, i thought maybe you dont have enough dof, but the bottom middle is sharp, then gradually turns to mush on the bottom right.

did you buy it from panavision? you should send it back.

paul
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Hi Paul,

No I didn't.

But I have a direct contact at Mamiya Japan so first thing in the new year I will be in contact with them.

Simon
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Simon Harper
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« Reply #17 on: December 29, 2007, 06:58:24 PM »
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Nick I beat you to it!
Cheers,
Willem.
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Thanks for Peters email. Have send him a email so hopefully he can help.
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Simon Harper
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« Reply #18 on: December 29, 2007, 07:37:25 PM »
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Simon

Iíve got a 28mm that I believe is tack sharp.  Iíve been upgrading my system for the past couple days and havenít had a chance to do much of anything else.  Give me about two more days, and if you still would like a sample let me know.  I do have one up on an earlier post from the South Rim of the Grand Canyon.  Let me know if I can help.

don
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« Reply #19 on: December 29, 2007, 07:48:44 PM »
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Simon

Iíve got a 28mm that I believe is tack sharp.  Iíve been upgrading my system for the past couple days and havenít had a chance to do much of anything else.  Give me about two more days, and if you still would like a sample let me know.  I do have one up on an earlier post from the South Rim of the Grand Canyon.  Let me know if I can help.

don
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Hi Don,

That would be great if you could send  some sample images with your 28mm.
From the use you have all ready had does your lens have the softness in the bottom corners as I am getting?

Cheers

Simon
« Last Edit: January 08, 2008, 12:26:50 AM by HarperPhotos » Logged

Simon Harper
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