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ukwoody · 06-25-2012, 06:04 AM

Hi all, just discovered the lens I was interested in is the non Di version (gen mistake by retailer). Is it worth me worrying about it being the non di version for use on my K5? or will I not really notice any difference. I assume the rest is bascially the same and the quality is still superb?

It's still £175 though :-(

woody
Forgot to say it's still the 2.8 not the 2.5

Last edited by ukwoody; 06-25-2012 at 06:13 AM.

JinDesu · 06-25-2012, 06:09 AM

The Di version is only different from the non-Di version in cosmetics and the Di coating (which supposedly reduces flare, but I have not noticed a difference).

The non-Di version is a great bargain lens as it is very sharp, renders colors quite well, and has the Tamron lovely bokeh.

ukwoody · 06-25-2012, 06:18 AM

umm just read somewher ther non di version was designed for 35mm film and has different focal lengths ect? and on digital you are only using part of the image?

woody Does that sound right?

**pacerr** · 06-25-2012, 06:21 AM

While the effect of Di coating may be measured in test labs, and applies only to specific circumstances anyway, the solid reputation of the lens has been built over time as it is.

Without a direct, side-by-side comparison with an identical lens with (an undefined) Di coating you'll never be able to tell the difference in practical use.

While you're at it, pick up copies of the SP AF 10-24, 17-50, 24-135 and 28-75 -- all good lenses. And all designed for full frame film so, yes you're only using the center "sweet spot" of the image circle -- which has nothing to do with the Di coating.

JinDesu · 06-25-2012, 06:23 AM

No - there is no difference there. I believe both the Non-di and the Di versions cover the full 35mm (full frame) sensor.

The only difference between the two lenses is the coating (Di coating) and some cosmetics (the newer version looks and feels better).

**miltona580** · 06-25-2012, 07:09 AM

I've got the Di version - it's really a superb lens. I'd highly recommend it.

ukwoody · 06-25-2012, 07:36 AM

many thanks guys, just bought it right now!

woody

jimr-pdx · 06-25-2012, 06:53 PM

You will be hard-pressed to see a difference. Tamron's website states that it is optically identical, as JinDesu says. I had the non-Di and it was an excellent lens. It wasn't a great fit in my kit, but that was in no way the lens' fault!

ukwoody · 06-26-2012, 02:37 AM

Thanks Jimr!]

woody

06-25-2012, 06:04 AM	#1
ukwoody Senior Member Join Date: Dec 2010 Location: Pembrokeshire, Wales,UK Posts: 152	Urgent. Tamron sp90 non di opinion please Hi all, just discovered the lens I was interested in is the non Di version (gen mistake by retailer). Is it worth me worrying about it being the non di version for use on my K5? or will I not really notice any difference. I assume the rest is bascially the same and the quality is still superb? It's still £175 though :-( woody Forgot to say it's still the 2.8 not the 2.5 Last edited by ukwoody; 06-25-2012 at 06:13 AM.

06-25-2012, 06:53 PM	#8
jimr-pdx Pentaxian Join Date: May 2010 Location: now 1 hour north of PDX Photos: Gallery \| Albums Posts: 3,897	You will be hard-pressed to see a difference. Tamron's website states that it is optically identical, as JinDesu says. I had the non-Di and it was an excellent lens. It wasn't a great fit in my kit, but that was in no way the lens' fault! Last edited by jimr-pdx; 06-26-2012 at 05:48 AM.

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06-25-2012, 06:09 AM	#2
JinDesu Veteran Member Join Date: Jun 2011 Location: New York City Photos: Gallery Posts: 5,638	The Di version is only different from the non-Di version in cosmetics and the Di coating (which supposedly reduces flare, but I have not noticed a difference). The non-Di version is a great bargain lens as it is very sharp, renders colors quite well, and has the Tamron lovely bokeh.

06-25-2012, 06:18 AM	#3
ukwoody Senior Member Join Date: Dec 2010 Location: Pembrokeshire, Wales,UK Posts: 152 Original Poster	umm just read somewher ther non di version was designed for 35mm film and has different focal lengths ect? and on digital you are only using part of the image? woody Does that sound right?

06-25-2012, 06:21 AM	#4
pacerr Loyal Site Supporter Join Date: Jan 2008 Location: Paris, TN Photos: Gallery \| Albums Posts: 3,350	While the effect of Di coating may be measured in test labs, and applies only to specific circumstances anyway, the solid reputation of the lens has been built over time as it is. Without a direct, side-by-side comparison with an identical lens with (an undefined) Di coating you'll never be able to tell the difference in practical use. While you're at it, pick up copies of the SP AF 10-24, 17-50, 24-135 and 28-75 -- all good lenses. And all designed for full frame film so, yes you're only using the center "sweet spot" of the image circle -- which has nothing to do with the Di coating.

06-25-2012, 06:23 AM	#5
JinDesu Veteran Member Join Date: Jun 2011 Location: New York City Photos: Gallery Posts: 5,638	No - there is no difference there. I believe both the Non-di and the Di versions cover the full 35mm (full frame) sensor. The only difference between the two lenses is the coating (Di coating) and some cosmetics (the newer version looks and feels better).

06-25-2012, 07:09 AM	#6
miltona580 Site Supporter Join Date: Apr 2011 Location: Oklahoma Posts: 309	I've got the Di version - it's really a superb lens. I'd highly recommend it.

06-25-2012, 07:36 AM	#7
ukwoody Senior Member Join Date: Dec 2010 Location: Pembrokeshire, Wales,UK Posts: 152 Original Poster	many thanks guys, just bought it right now! woody

06-26-2012, 02:37 AM	#9
ukwoody Senior Member Join Date: Dec 2010 Location: Pembrokeshire, Wales,UK Posts: 152 Original Poster	Thanks Jimr!] woody

Urgent. Tamron sp90 non di opinion please

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