Single-focal length wide-angle lens for DSLRs with crop sensors?

[mhahn]

<p>Do any of the major manufacturers make a single-focal-length wide-angle lens (18 or 19 mm) that would become a 28 mm lens on a crop-sensor DSLR?<br>

Is this a technologically difficult lens to manufacture?</p>

<p> </p>

[leslie_cheung]

<p>No, Nikon has a 18mm f2.8...</p>

<p>it not hard to make but hard to sell.</p>

[SCL]

<p>There's a Tamron Adaptall 17mm f3.5, relatively cheap. I just got one last week from the big auction site for around $128, and I've seen the same one on KEH in BGN condition for a little less. Experimented today with it on two crop sensor DSLRs and stopped down to f5.6 it does a fine job. Next week I'll be running thru my QC tests with it on a 35mm SLR where it will be a true 17mm.</p>

[Spearhead]

<p>Canon has a 20/2.8. What problem are you trying to solve, there are plenty of wide angle lenses.</p>

[thomas_k.]

<p>Nikon made 18mm autofocus and manual focus lenses. There is little difference though in the field of view of 18,19 and 20mm lenses on DX camera and there is plenty of 20mm primes available for all systems so you may look for these intead of 18-19mm.</p>

[ian_gordon_bilson]

<p>Stephen - I'm sure there would be some interest in your results with the 17mm : feel free to post updates.</p>

[Ed_Ingold]

<p>There is a big difference in FOV between an 18mm and 20mm lens, whether used on an FX or DX camera. There's a big difference in price too - the Nikkor 18/2.8 cost three times as much as the 20/2.8. Before spending that kind of money, consider getting a 17-35/2.8 zoom, which actually has better IQ than the prime lenses it replaces.</p>

<p>These lenses are designed for full-frame use, but can be used on a DX camera without difficulty. You can't go the other way with a DX lens, however. There are very few prime wide-angle lenses designed strictly for DX cameras.</p>

[phule]

<p>[[Do any of the major manufacturers make a single-focal-length wide-angle lens (18 or 19 mm) that would become a 28 mm lens on a crop-sensor DSLR?]]</p>

<p>You can always buy the Canon 17mm f/4 TS.<br>

http://www.bhphotovideo.com/c/product/606803-USA/</p>

<p> </p>

[thomas_k.]

<p>In my opinion the difference between 18mm and 20mm lenses is small - but you can check it for yourself (and decide if the difference is big or small) using nikon's lens simulator at: http://imaging.nikon.com/products/imaging/lineup/lens/simulator/index.htm</p>

[mhahn]

<p>Thanks for the responses. I would like to be able to get something like a Nikon D5000 (i.e., a good quality, but relatively small DSLR) and mate it with relatively small prime lenses. I know Nikon makes 35 and 50 mm prime lenses that will work with the D5000, but getting a lens that is equivalent to a 28 mm seems problematic.</p>

[bill_tuthill]

Pentax has the 15/4 DA and 21/3.2 DA, both reasonably priced, so why not go with the K-x?

[mhahn]

<p>Does Pentax make other single-focal-length lenses for the K-x? Like a 35 mm (which would have an approximately normal field of view, after accounting for the crop factor) and a short telephoto?</p>

[phule]

<p>[[Does Pentax make other single-focal-length lenses for the K-x?]]</p>

<p>14mm, 15mm, 21mm, 31mm, 35mm, 40mm, 43mm, 50mm, 70mm, 77mm, 100mm, 200mm, 300mm.</p>

<p>http://www.pentaximaging.com/camera-lenses/</p>

<p> </p>