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04-23-2008, 09:49 AM   #1
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Quantaray 70-300: Sigma or Tamaron?

I was able to pick up a used Quantaray 70-300 used for $40. It takes some pretty nice sharp images in good daylight so for the price I am pretty happy with it as I am going to use it to determine what kind of lengths I tend to shoot. Anyway, reading various posts on the internet I see that this is either a rebranded Sigma or Tamron lens. Seeing that there are two threads on either lens I didn't want to post anything off topic i decided to just post a new thread. Is there anyway to find out which? It has a Macro lock switch for 200-300mm and is labeled as follows:

70-300mm
1:4-5.6
LDO MACRO




The lens is made in Japan and has a serial# 1039543

I understand that this lens isn't going to be exactly like the Sigma/Tamron but it would be nice to know since it seems each one has it's own limitations so to speak.

04-23-2008, 10:16 AM   #2
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What's the filter size? I think 62mm = Tamron and 58mm = Sigma. I might have it backwards, so I'd research that before taking my word for it.

My guess is that you have a Tamron LD
04-23-2008, 10:32 AM   #3
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Awesome! I didn't even think to look at that. The filter size is 58mm so I guess I have a Sigma version. Thanks for the help! After reading the specs a little more closer I see that the Sigma lens has a Macro Lock for 200-300mm lengths wheras the Tamron has the lock for 180-300mm lengths. For $40 bucks I think I got a pretty good deal!
04-23-2008, 10:51 AM   #4
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I'd say so! I had the same lens (non-APO Sigma and took some pretty good pics with it.

I'm pretty sure this was taken at 300mm@F4:


100% crop:



Stop it down and it sharpens up pretty good. Also be aware of shooting in conditions that are prone to producing PF.

04-23-2008, 10:54 AM   #5
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The Quantaray 70-300 and the Sigma 70-300 non APO are the same lens. According the manager at the local Ritz all the Quantarays are re labeled Sigmas. Thats what I was told anyhow.
04-23-2008, 10:57 AM   #6
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QuoteOriginally posted by reeftool Quote
The Quantaray 70-300 and the Sigma 70-300 non APO are the same lens. According the manager at the local Ritz all the Quantarays are re labeled Sigmas. Thats what I was told anyhow.
That may be true as of right now, but at one point both Tamron and Sigma were producing 70-300s for Ritz. Filter size was the easiest way to tell them apart.
04-23-2008, 11:43 AM   #7
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I had the same lens for a while- it's very nice, although I was never really sure whether it was the APO version or not. I suspect so- it was pretty darn good.
04-23-2008, 12:01 PM   #8
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The person at my local Ritz told me it was a Tamron. Either way it is a solid performer in good light, and not horrible otherwise.

04-23-2008, 12:38 PM   #9
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Just to clarify why I had asked this I had bought the lens used. It was originally bought for a ZX-50 SLR. It went unused when the original owner went to another DSLR system. So it puts my lens in the age range of when the Tamron/Sigma switch happened. There are a lot of posts on the internet but nothing I could find that would identify the manufacturer of this lens. I am very happy with the performance of this lens when I was outside shooting yesterday. I'm going to have to pay with it at dusk now to get a feel of how it performs in a low light setting.
04-23-2008, 01:00 PM   #10
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Check the very first post in this thread: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/24380-sigma-vs...pressions.html
04-23-2008, 04:50 PM   #11
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Quantaray's are either Sigma or Tamrons normally. Yours doesn't lookk like a Tamron and has a 58mm thread so I would say its a Siggy. But LDO...?!m LowDispersion"Optics"??

Thanks
04-23-2008, 05:06 PM   #12
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I think LDO "Low Dispersion Optics" is the rebanded Quantaray version of Sigma's SLD "Special Low Dispersion" glass.
04-24-2008, 06:34 AM   #13
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QuoteOriginally posted by reeftool Quote
The Quantaray 70-300 and the Sigma 70-300 non APO are the same lens. According the manager at the local Ritz all the Quantarays are re labeled Sigmas. Thats what I was told anyhow.
That's false, and I know the 70-300s can be either.

I think older ones are Sigmas, new ones are Tamrons. Mine is a Tamron. I refer to it when posting on threads as the Tamron 70-300 even though it is a Quantaray.

The difference (other than price) between the Tamron official branded version and the Quantaray seems to be:
1) Price
2) Warranty
3) Lens cap - The Quantaray version has an AWFUL lens cap, while the Tamron has one of those nice "center pinch" ones. You can order a center pinch cap seperately for $3-4 though.

As others have said, the easiest way to tell which version you have is the filter size.
04-24-2008, 07:54 AM   #14
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For the continuing 70-300mm debate and those that like reviews, we have:

Shutterbug: Sigma AF 70-300mm f4-5.6 DL Macro

Shutterbug: A Trio Of Tamron Zooms

Shutterbug: Sigma AF 70-300mm f/4-5.6 DL Macro Super And APO Macro Super

The solution is buy either (they are so inexpensive/produce great images) and enjoy it. However, the 55-300mm is now showing up in limited #'s, so waiting might be prudent.

Last edited by ivoire; 04-24-2008 at 11:33 AM.
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