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09/06/2005 02:50:54 AM · #1 |
Will the Tamron 28-75m F2.8 XR Di..... lens fit a 1.3x crop or a Full frame digital body?
My reason for asking is the Di notation. I am trying to plan for the future :) |
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09/06/2005 03:01:04 AM · #2 |
Yes. The Di designation is not equivalent to Canon's EF-S designation, which DOES denote a lens that will only work on the 1.6 bodies. It has more to do with optimizing the angle at which light strikes the sensor at the extreme edges of the image, improving edge-to-edge sharpness at the wide end of the zoom.
I like mine a lot. There are apparently quality issues from copy-to-copy, but I got lucky. If I were you I'd buy from a local store so you can swap the copy in for another one if you receive a less-than-optimum example.
R.
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09/06/2005 03:09:34 AM · #3 |
Tamron Di lenses can be used and are designed for superior use on both digital and film SLR cameras.
So yes the Tamron SP AF28-75mm F/2.8 XR DI LD Aspherical (IF) lens can be used on a 1.3 crop camera and a full frame camera
Here is a a link to Tamron it will show you that this lens can be used with both digital and 35mm or full frame cameras. The Di II cannot, they are made for digital cameras with sensors smaller than 24x16mm. |
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09/06/2005 03:43:57 AM · #4 |
| Can I add a further question to this thread? I currently have a 19 - 35 lens, which with my new dSLR, comes in at around 28.5 - 52.5 equivalent. I am therefore in the market for a new short zoom. Having spoken to the staff at my local Jessops store (probably my first mistake) they reckon that the Sigma DG lenses have their focal lengths calculated on the basis of a dSLR, but will work on a film body (I use both). On the face of it, this seems like a load of tosh, dur to the differing conversion ratios for each manufacturer. I haven't yet been able to find out from Sigma, and I wondered whether any of you had any experience/knowledge with these lenses in particular who might be able to put these 'experts' to shame, or indeed allow me to hang my head in similar? |
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09/06/2005 03:47:10 AM · #5 |
Originally posted by marklovell:
Can I add a further question to this thread? I currently have a 19 - 35 lens, which with my new dSLR, comes in at around 28.5 - 52.5 equivalent. I am therefore in the market for a new short zoom. Having spoken to the staff at my local Jessops store (probably my first mistake) they reckon that the Sigma DG lenses have their focal lengths calculated on the basis of a dSLR, but will work on a film body (I use both). On the face of it, this seems like a load of tosh, dur to the differing conversion ratios for each manufacturer. I haven't yet been able to find out from Sigma, and I wondered whether any of you had any experience/knowledge with these lenses in particular who might be able to put these 'experts' to shame, or indeed allow me to hang my head in similar? |
As far as I know, ALL these lenses are marked, or named, with their actual focal lengths. It's up to you to figure the crop factor. Anything else would be absurd.
Looks like your only real option for going wider is the Sigma 12-24mm f/4.5-5.6 EX DG Aspherical. It's a very nice lens, and available in Pentax mount. I suppose there are primes available also, but I really like having zoom in this range. I use the 10-22mm Canon myself.
R.
Message edited by author 2005-09-06 03:53:32.
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09/06/2005 03:56:22 AM · #6 |
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09/06/2005 08:00:17 AM · #7 |
Originally posted by marklovell:
Can I add a further question to this thread? I currently have a 19 - 35 lens, which with my new dSLR, comes in at around 28.5 - 52.5 equivalent. I am therefore in the market for a new short zoom. Having spoken to the staff at my local Jessops store (probably my first mistake) they reckon that the Sigma DG lenses have their focal lengths calculated on the basis of a dSLR, but will work on a film body (I use both). On the face of it, this seems like a load of tosh, dur to the differing conversion ratios for each manufacturer. I haven't yet been able to find out from Sigma, and I wondered whether any of you had any experience/knowledge with these lenses in particular who might be able to put these 'experts' to shame, or indeed allow me to hang my head in similar? |
I called Sigma support back in December because one on-line shop told me something similar. The Sigma lens focal lengths are the same as everyone else's (ie set for a film or full-frame, no crop factor camera). The support guy explained that the focal length of the lens was independent of the amount of the image circle the lens produces (or that the camera uses).
Think about it this way: you hold a 50mm lens 50mm from the film plane to get the image in focus. The light going through the lens will form an image that's usually larger than a 24x36 mm rectangle (ie bigger than a 35mm film frame). If your sensor is smaller than that, the focal length doesn't change, but you get the benefit of "digital zoom". It may help to look at this "backwards": if a full frame sensor would produce a 4x6 print, a 1.6 crop factor sensor would produce a 2.5 x 3.75 print on 4x6 paper, with a large border. Most people just crop out the border and enlarge the image to fit the paper. |
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09/08/2005 11:17:54 AM · #8 |
Well said Hankk.
Hey Bearmusic, thanks again for posting, your a serious tribute to the forums and this site!
Anyone got comments on the tokina 12-24 f4.0? and how it stacks up against the Sigma? This might be a good choice for you Mark. The price is decent. Check it out at //www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=360349&is=REG&addedTroughType=categoryNavigation
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09/08/2005 01:39:51 PM · #9 |
Thanks for all of the info advice and links, been v. helpful.
I will consider that lens if I can find it for a decent price in the UK. |
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