Tamron 28-75 and cropped sensor

[groovyone]

Originally Posted by rockpics

True, but 28mm is about so-called "normal" field of view on APS-C, and it is wide on full frame.

Yes, but the OP is comparing both lenses on APS-C.

[Jaymoney$]

I was in a similar situation with my D90. I found out when i used the 17-55 most my images were at 24mm and up range therefore i just opted for the 28-75mm.

[shnitz]

Mandy, I want you to forget about the 1.5 crop factor. It doesn't actually change anything whatsoever. If you put your 18-200mm lens on your camera, your 35mm lens on your camera, a 28-75mm lens on your camera, or your kit lens 18-105mm lens on your camera, and you zoom them all to 35mm for example, they will all take the EXACT SAME PHOTOGRAPH. I want you to put your 18-200mm lens on your camera. Zoom it to 28mm. The Tamron lens at 28mm will take the EXACT SAME PHOTOGRAPH. Now, zoom your lens in to 75mm. The Tamron lens, zoomed to 75mm will take THE EXACT SAME PHOTOGRAPH. The only difference is the Tamron lens will be sharper, and it will have the capability to blur the background more because of its f/2.8 aperture.


The only reason that the crop factor exists is because it lets people know what they are getting in to. Since 35mm film was so prevalent for such a long time, it has been set as the standard. Because all different cameras have different size sensors, it take a different focal length, in millimeters, to produce the same picture. Let's use a few cameras as an example:
-Nikon D3 with a 50mm lens
-Nikon D7000 with a 35mm lens
-Panasonic GH2 with a 25mm lens
-Nikon V1 with an 18mm lens

Now, those cameras all have different focal length lenses on them, right? However, they will all pretty much take the EXACT SAME PHOTO, because they all use different size sensors to capture a larger or smaller amount of light that is being passed through the lens. The crop factor comes in ONLY to let you know what you're getting in to, because if I walked in to Best Buy right now, not knowing the exact sensor that a camera had, and someone tried to sell me a Nikon V1 with an 18mm lens, I would say to them, "I don't need something as wide as an 18mm lens, I'm not doing architecture and landscape photography!" Whereas, an 18mm lens is actually a normal walkaround lens on such a tiny-sensor camera. So, the salesman can reply to me, "No, the Nikon V1 isn't full frame! It is a 2.7x crop, so the 18mm lens acts like a 50mm lens would on a normal fullframe camera."

Does that make sense now? If not, I suggest a few creative google searches, some reading on wikipedia, and perhaps watching a few youtube videos.

[Tea and Two]

OK, I think I got it ! Thank you all :)

[Nikonfan]

I have two crop sensor Nikons and many lenses and 90% of the time I use my D300 and Tamron 28-75 f2.8 combination. It is so useful and the perfect walk about lense with a very useful focal range. It's not my most expensive lens but get's the most use by far!

[JLBrown]

I have used the Tamron 28-75 for years. I bought my first one when I use a Sony Alpha 100. I ended up selling off all my Sony gear and switched to Nikon. I missed that lens so much I ended up buying another for my Nikon D90. It pretty much lives on there. It's that good!!!

[ualymerej]

and to clear things up a little more, DX lenses are designed for crop frame sensors - meaning it uses less glass than a FX (full frame) lens due to the sensor being smaller. The focal length values remain equivalent between the DX and FX lenses (as discussed earlier: 28mm DX lens or 28mm FX lens, it'll look the same on a DX camera), it's just DX lenses don't have enough glass to cover a full frame sensor, and thus is not advised to be used on an FX camera. And in case it wasn't clarified, APS-C = 1.5x crop sensor.

With all that said, the 28-75 is much more useful than the 17-50 in my opinion. The larger aperture is much more beneficial at the longer range since 1) shallower DoF is more apparent at the longer end and 2) you need faster shutter speeds at the longer end to reduce the effects of camera shake, so a larger aperture allows you to do that. Yes, 28mm on a crop frame is not very wide, which makes shooting in small rooms somewhat difficult, but you do have the 18-200 which will allow you to shoot in tighter spots.

[Nikonfan]

Originally Posted by JLBrown

I have used the Tamron 28-75 for years. I bought my first one when I use a Sony Alpha 100. I ended up selling off all my Sony gear and switched to Nikon. I missed that lens so much I ended up buying another for my Nikon D90. It pretty much lives on there. It's that good!!!

It sounds like we feel the same way about our Tamron 28-75. I originally was a bit nervous about my purchase. The only other Tamron I had owned was from their consumer line and it had horrible C/A and distortion issues. Apparently there is a large difference in quality between their consumer and professional lines.

[cwend]

I love mine....now. I had to send it back to Tamron 3 times to get the backfocus issue fixed, but after doing that it has been a great lens

[DigMe]

I rented one to try it out because I'm thinking about buying it. Used it for a family session today. It is very sharp.

brad