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TAMRON SP Di AF 90 mm 1:2.8 MACRO 1:1 ...quite disappointing!
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Nov 17, 2021 15:34:54   #
Dan' de Bourgogne
 
I'm a lucky but disappointed person...(my D7200 is kaputt...waiting it gets repaired but this seems to happen perhaps in 2022!)

Disappointed because I don't understand how a macro lens works.
Lucky because recently, a friend made me a superb gift: she (Elizabeth) gave me her old Nikon D70 (full operationnel!sensor about 16 mm x 24 mm) with the lens TAMRON 90mm macro, bla bla bla.

1) She knows how I'm feeling bad without my D7200.
2) She is now using a "microfourthird" camera with a 200-400 mm lens because it is much lighter = so, she did'nt use her Nikon gear for years any more...so "weg damit".

Well...this is my very first Macro Lens! This lens has a good reputation
This evening I wanted to try that lens.
I figured out the minimal focus distance to be about 44cm...say 17 inches.
The lens is labeled "MACRO 1:1"...
Then I thought, if focused at mini distance (17"), any 24 mm long object would completely fill the 24 mm lenght of the sensor!
To see exactly what happens and to check the effectiv magnification ratio, I decided to take a picture of a "measuring tape" at the minimum possible focusing distance.

Guess what?
I expected to get 24 or 25 mm of this "millimetric ribbon" on the picture...
NOT AT ALL...I got much more...71 mm !
See the picture I took.

I can't tell this picture is a macro. At the best it's a close-up.
Certainly somewhere is anything wrong.
But what?
Does somebody knows how to handle that lens?
I just want to know what to do in order to fill the frame with a subject measuring 24 mm x16mm.
In advance many thanks for Your help!

shot at 17inches mini focus distance
shot at 17inches mini focus distance...
(Download)

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Nov 17, 2021 15:39:03   #
Rongnongno Loc: FL
 
Tiens ! Un Bourguignon...
La vache (bœuf) alors!!!

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Nov 17, 2021 15:40:02   #
User ID
 
Any 90mm lens of traditional conventional design must have 360mm between sensor and subject at 1:1. It’s always 4X the FL (details elsewhere, NOT here). 360mm is 14” and your 17” is not a significant difference.

There are two or more Tamron 90mm macros. The later models might NOT use conventional traditional design. But one thing should remain true: if the focusing scale is reading “1:1” then the field of view is identical to the sensor size.

IOW, we need more info !

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Nov 17, 2021 15:44:58   #
Dan' de Bourgogne
 
Rongnongno wrote:
Tiens ! Un Bourguignon...
La vache (bœuf) alors!!!


c'est pas la 1ère fois que j'apparais ici! Mouaip...à Dijon, le boeuf...avec sauce bien épaisse au Pinot noir bien enfariné.
Z'auriez pas une idée comment utiliser un Tamron macro par hasard?
Je ne parviens pas à prendre un sujet au véritable rapport 1:1...c'est très agaçant!

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Nov 17, 2021 15:46:01   #
Rongnongno Loc: FL
 
I really do not see why you are disappointed here.

The lens focuses perfectly.
Only one small issue: color noise, but that should be corrected in Post.

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Nov 17, 2021 15:50:13   #
Rongnongno Loc: FL
 
Je suis a Gex en ce moment.
Dimanche je vais, avec ma femme, a Troyes.
Si vous voulez nous pouvons faire une pause à Dijon.

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Nov 17, 2021 15:52:06   #
User ID
 
Rongnongno wrote:
I really do not see why you are disappointed here.

The lens focuses perfectly.
Only one small issue: color noise, but that should be corrected in Post.

Typical. Best ignored.

Reply
 
 
Nov 17, 2021 15:53:16   #
Dan' de Bourgogne
 
Rongnongno wrote:
I really do not see why you are disappointed here.

The lens focuses perfectly.
Only one small issue: color noise, but that should be corrected in Post.


For sure, focus is OK...I don't complain about it...I just don't get the "macro effect".
I just would like to capture an object 16 mm x 24 mm filling the frame
In other word, getting a real "macro picture" with ratio 1:1...

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Nov 17, 2021 15:54:11   #
User ID
 
Some macros have a latch to block off the near focus range. When your field of view is 71mm wide, what is the reading on the focus scale ?

I have a very old Tamron 90 and yours may be optically different. I hope yours has a focus scale !

Reply
Nov 17, 2021 16:02:46   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
Dan' de Bourgogne wrote:
I'm a lucky but disappointed person...(my D7200 is kaputt...waiting it gets repaired but this seems to happen perhaps in 2022!)

Disappointed because I don't understand how a macro lens works.
Lucky because recently, a friend made me a superb gift: she (Elizabeth) gave me her old Nikon D70 (full operationnel!sensor about 16 mm x 24 mm) with the lens TAMRON 90mm macro, bla bla bla.

1) She knows how I'm feeling bad without my D7200.
2) She is now using a "microfourthird" camera with a 200-400 mm lens because it is much lighter = so, she did'nt use her Nikon gear for years any more...so "weg damit".

Well...this is my very first Macro Lens! This lens has a good reputation
This evening I wanted to try that lens.
I figured out the minimal focus distance to be about 44cm...say 17 inches.
The lens is labeled "MACRO 1:1"...
Then I thought, if focused at mini distance (17"), any 24 mm long object would completely fill the 24 mm lenght of the sensor!
To see exactly what happens and to check the effectiv magnification ratio, I decided to take a picture of a "measuring tape" at the minimum possible focusing distance.

Guess what?
I expected to get 24 or 25 mm of this "millimetric ribbon" on the picture...
NOT AT ALL...I got much more...71 mm !
See the picture I took.

I can't tell this picture is a macro. At the best it's a close-up.
Certainly somewhere is anything wrong.
But what?
Does somebody knows how to handle that lens?
I just want to know what to do in order to fill the frame with a subject measuring 24 mm x16mm.
In advance many thanks for Your help!
I'm a lucky but disappointed person...(my D7200 is... (show quote)


Are you measuring from the subject to the sensor plane or to the front element of the lens? the 17" should be from sensor plane to subject for 1:1. I have a d70s and it does not have a sensor plane indicator, but my Sonys, more recent Nikons have a small circle with a line through it's center. That line corresponds to the sensor plane. I just measured a Sigma 150 2.8 Macro on a D810 and it was very close to spec. The image of the measuring tape was about 1.375" or slightly smaller than 1.41732" (36mm), which would indicate a greater than 1:1. The lens was focused manually. The AF does not get quite as close. The minimum focus distance of the lens is listed as 14.96" and I measured about the same (to the sensor plane.

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Nov 17, 2021 16:06:29   #
Quixdraw Loc: x
 
This is a very old camera with 6.1 MP. Here is some info you may not have https://www.the-digital-picture.com/Reviews/Tamron-90mm-f-2.8-Di-Macro-Lens-Review.aspx
I would not judge the lens till you try it on a more current camera - your D7200 will do a fine job for testing when you get it back.

Reply
 
 
Nov 17, 2021 16:33:09   #
Dan' de Bourgogne
 
User ID wrote:
Any 90mm lens of traditional conventional design must have 360mm between sensor and subject at 1:1. It’s always 4X the FL (details elsewhere, NOT here). 360mm is 14” and your 17” is not a significant difference.

There are two or more Tamron 90mm macros. The later models might NOT use conventional traditional design. But one thing should remain true: if the focusing scale is reading “1:1” then the field of view is identical to the sensor size.

IOW, we need more info !


Many Thanks for Your comment UserID! I don't now when this lens has been released...she just said she bought it many years ago...6 or 7 years ago or perhaps more.
Well, as far I understand, if the field of view is identical to the sensor size, I should fill the frame of the viewfinder with a 16 mmx24 mm big subject .
The problem is exactly this doesn't happen.
To fill the viewfinder at 17" minimum focus distance, the subject must be 71 mm big instead of 24 mm.

Reply
Nov 17, 2021 16:49:58   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
Dan' de Bourgogne wrote:
Many Thanks for Your comment UserID! I don't now when this lens has been released...she just said she bought it many years ago...6 or 7 years ago or perhaps more.
Well, as far I understand, if the field of view is identical to the sensor size, I should fill the frame of the viewfinder with a 16 mmx24 mm big subject .
The problem is exactly this doesn't happen.
To fill the viewfinder at 17" minimum focus distance, the subject must be 71 mm big instead of 24 mm.


Are you measuring from the subject to the sensor plane?

Reply
Nov 17, 2021 16:52:45   #
Dan' de Bourgogne
 
Gene51 wrote:
Are you measuring from the subject to the sensor plane or to the front element of the lens? the 17" should be from sensor plane to subject for 1:1. I have a d70s and it does not have a sensor plane indicator, but my Sonys, more recent Nikons have a small circle with a line through it's center. That line corresponds to the sensor plane. I just measured a Sigma 150 2.8 Macro on a D810 and it was very close to spec. The image of the measuring tape was about 1.375" or slightly smaller than 1.41732" (36mm), which would indicate a greater than 1:1. The lens was focused manually. The AF does not get quite as close. The minimum focus distance of the lens is listed as 14.96" and I measured about the same (to the sensor plane.
Are you measuring from the subject to the sensor p... (show quote)


Nice You are here Gene!
Yes, my D70 has the little circle with the line...looks like the sign for "diameter"...just the line is horizontal.
I measured the 17" (44cm) mini focus distance from this "circle/line-sign" up to the subject IOW, focus plane/subject distance.
The picture I posted has been shot with AF...but I also tried to focus manually...I got the same mini focus distance.
The focus ring let displays a scale through a kind of "window".
To shot this posted picture I set the focus ring at the minimum possible distance stop = 17"
Is there a trick to "unleash" this "focus ring" and making possible to set the mini distance focus even closer?

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Nov 17, 2021 16:59:42   #
Dan' de Bourgogne
 
User ID wrote:
Some macros have a latch to block off the near focus range. When your field of view is 71mm wide, what is the reading on the focus scale ?

I have a very old Tamron 90 and yours may be optically different. I hope yours has a focus scale !

Yes userID...my lens has a focus scale...mini seems to be 0,44m...last biggest distance just before "infinity" reads a " kind of L" few mm further away from 3m/10'
I don't know what a latch is...

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