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Tamron 30A (80-200 2.8) vs. Tamron 67D (70-210 2.8)?
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PostPosted: Sun Mar 31, 2019 5:54 pm    Post subject: Tamron 30A (80-200 2.8) vs. Tamron 67D (70-210 2.8)? Reply with quote
Does anybody know if there are noticeable differences in optical quality between the manual-focus Tamron SP 80-200mm F/2.8 LD (30A) and the Tamron SP AF 70-210 mm f/ 2.8 LD (67D)?

I have no idea how to read optical formulas. Here's what I could find online:

80-200 MF (source: http://www.adaptall-2.com/lenses/30A.html)


70-210 AF (source: http://allphotolenses.com/lenses/item/c_3431.html)


The two formulas look very similar (though not identical). Can it be assumed that the resulting optical quality will be similar as well? The Tamron 30A is a universally-loved lens, while his younger AF cousin barely ever gets mentioned.

The similarities don't end there. Their weight is virtually the same (1359g and 1,340g), their total length is virtually the same (178mm and 177.5mm), they have an identical MFD of 1.5 metres, a minimum aperture of f/32, and a 77mm filter diameter.

The two pages I linked to above also show resolution charts, but I don't know how to read them either. More info on the AF lens can be found here (in Japanese): https://www.tamron.co.jp/data/af-lens/67d.htm

Thanks in advance to anyone who can shed any light on this.


PostPosted: Mon Apr 01, 2019 11:39 am    Post subject: Re: Tamron 30A (80-200 2.8) vs. Tamron 67D (70-210 2.8)? Reply with quote
invisible wrote:
Does anybody know if there are noticeable differences in optical quality between the manual-focus Tamron SP 80-200mm F/2.8 LD (30A) and the Tamron SP AF 70-210 mm f/ 2.8 LD (67D)?

I have no idea how to read optical formulas. Here's what I could find online:

80-200 MF (source: http://www.adaptall-2.com/lenses/30A.html)


70-210 AF (source: http://allphotolenses.com/lenses/item/c_3431.html)


The two formulas look very similar (though not identical). Can it be assumed that the resulting optical quality will be similar as well? The Tamron 30A is a universally-loved lens, while his younger AF cousin barely ever gets mentioned.
.


The 70/210 is AF / Not Manual Focus
It SEEMS that is it basically the same formula with a subtel variation: The only VISIBLE difference beetwen both formulas is that the third group (compensator which makes focus stable during focal variation) is made of three elements instead of two
The other part SEEMS identical but you can never be sure (subtle difference in optical element size/curvature) can makes a great difference as well as the choice of glasses


PostPosted: Mon Apr 01, 2019 11:15 pm    Post subject: Re: Tamron 30A (80-200 2.8) vs. Tamron 67D (70-210 2.8)? Reply with quote
PBFACTS wrote:
The 70/210 is AF / Not Manual Focus
It SEEMS that is it basically the same formula with a subtel variation: The only VISIBLE difference beetwen both formulas is that the third group (compensator which makes focus stable during focal variation) is made of three elements instead of two
The other part SEEMS identical but you can never be sure (subtle difference in optical element size/curvature) can makes a great difference as well as the choice of glasses

I understand that the 70-210 is autofocus. Judging by the similar optical formulas, I assumed that the 70-210 was the "heir" to the 80-200. I appreciate your comment about the subtle difference in optical elements (size, curvature, quality) possibly making a big difference. I assumed it could be the case, but really had no idea.

Hopefully someone familiar with both lenses can provide an opinion about their actual similarity or not.


PostPosted: Thu Apr 04, 2019 9:52 am    Post subject: Reply with quote
I've never had the opportunity to use the 70-210, but I own a copy of the 80-200. So I can't compare them. But the 80-200 is a wonderful optic and my suspicion is that Tamron decided to leave the basic formula alone and then add that one element to the inner compensator group to improve things somewhat without affecting things elsewhere.

One thing bears mentioning. The 80-200 is a push-pull zoom. Most AF zooms are two-ring; very few are push pull. The 70-210 is a two ring zoom. This means that mechanically the two zooms are very different. Yet they managed to keep almost the same grouping of elements. So it seems obvious to me that Tamron really wanted to keep that optical design.

I wouldn't be surprised if the 70-210 out performs the 80-200, but if it does, I'll wager that it isn't by much. It seems to me that Tamron is obviously fond of the original design. And it's no wonder to me. My 80-200 is a superb optic.


PostPosted: Fri Apr 05, 2019 8:03 pm    Post subject: Reply with quote
cooltouch wrote:
I've never had the opportunity to use the 70-210, but I own a copy of the 80-200. So I can't compare them. But the 80-200 is a wonderful optic and my suspicion is that Tamron decided to leave the basic formula alone and then add that one element to the inner compensator group to improve things somewhat without affecting things elsewhere.

One thing bears mentioning. The 80-200 is a push-pull zoom. Most AF zooms are two-ring; very few are push pull. The 70-210 is a two ring zoom. This means that mechanically the two zooms are very different. Yet they managed to keep almost the same grouping of elements. So it seems obvious to me that Tamron really wanted to keep that optical design.

I wouldn't be surprised if the 70-210 out performs the 80-200, but if it does, I'll wager that it isn't by much. It seems to me that Tamron is obviously fond of the original design. And it's no wonder to me. My 80-200 is a superb optic.

That was my line of thinking as well, but can't really find any confirmation of this anywhere. The only person with experience with both lenses that I could find online is this: https://www.dyxum.com/reviews/lenses/Tamron-AF-70-210mm-F2.8-SP-LD-lens-review7549.html -- judging from his ratings of the AF lens (top left), he seems hardly disappointed after upgrading.

I did further research and found another similarity between the two lenses (although this could mean nothing): both have 9 aperture blades.
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