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Pentax SMC-FA 50mm F1.7

Review by Andreas Busse, 1998


Build

Despite having a plastic shell this lens feels quite solid, possibly because of it's compact dimensions of 37 x 65mm. The main advantage of plastic construction is light weight, and this lens weighs a mere 0.17kg. The inner focusing tube doesn't rattle but it does have some play when fully extended, which is the price to pay for auto-focus operation. 49mm filters can be used, and the lens is supplied without a hood or case.

Optical

This lens is constructed of 6 elements in 5 groups. Despite not having a lens hood for it, flare has not been a problem to date, so the lens seems quite resistant to it. Even wide open at F1.7 results are sharp and contrasty, but stopping down to F2.8 or more improves this slightly. Photographs taken with this lens seem a bit cooler than those taken using my FA 100mm F2.8 macro. No distortion or vignetting is visable at any aperture, and close focusing of 0.45m gives a maximum magnification of 0.15.

Handling

Mounting such a small lens on a compact 35mm SLR, such as my Pentax MZ5 almost puts the combination in the P&S category! With a fast F1.7 maximum aperture you get fast AF even in low light conditions, and with low guide number built in flashes you get a useful range increase over slow zooms.

Manual focus feel is good for an AF lens with a decent amount of friction, although the manual focus ring is very small (5mm) and doesn't have any structure to aid feeling. Despite not being an internal focus construction the filter mount does not rotate during focusing - helpful if graduate or polarising filters are in use.

Compatibility

As you would expect I have not had any compatibility problemson the only body I've use it on so far a Pentax MZ5/ZX5

Price

I paid about DM300 (ca. $160) in May 98, but from a photo.net recommended retailer it should cost around 140 USD (August 1998).

Conclusion

This is the cheapest way to get a fast lens and as a bonus you also get excellent optical quality - this type of lens should be in everyones bag.

Editor's Note:

Where to Buy

The SMC-FA 50 is stocked by Adorama, a retailer that pays photo.net a referral fee for each customer, which helps keep this site in operation. For additional retailer information, see our recommended retailers page and the user recommendations section.


copyright 1998 Andreas Busse

The picture at the top was taken on the Coburg at Coburg while a motorcycle trip through "Thüringer Wald" an eastern part of Germany. I used my MZ5/ZX5 in aperture priority with the lens at F1.7 on FUJI Sensia II 100.  Add/View Comments

Article created 1998

Readers' Comments


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Adam Poll , September 01, 1998; 10:29 A.M.

Here's a trick. Buy a fast, inexpensive, excellent quality SMC-M(or A) 50mm 1.4, pair it up with a 1.7 AF converter and u have a reasonably fast 85mm autofocus with IF (or rear focus in this case) no lense movement, and the abilty to manually touch up focus with out fiddling with the damn switch. Close focus distance is halved so it also an instant macro of sorts.

Gene Poon , January 18, 1999; 04:48 P.M.

I loved this lens when I had it. I also love the Pentax-F 1.4 that replaced it. Both exquisitely sharp, with excellent contrast and fine gradation from lightest to darkest subjects; seems to have more levels of gradation than many other 50mm (I tried Brands C and N). This, incidentally, may be what makes Leica lenses so life-like in their tonal rendition. Focus is snappy. On either one, I can visually focus faster than my cameras (SF-1, PZ-1, ZX-5) can. The only reason I don't have the 1.7 FA any more is that I traded it for the Pentax-F 1.4, to someone who HAD to have the newest model of anything; I traded a couple of years for the half f-stop.


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