Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

Started Feb 4, 2005 | Discussions
CSLee Regular Member • Posts: 381
Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

i m planing to buy one of these lens but don't know which one is better in term of performance (focusing speed/accurate,sharpeness,contrast and etc.).can anyone please help me ,i m lose ?.

 CSLee's gear list:CSLee's gear list
Canon PowerShot 350 Panasonic Lumix DMC-FZ1 Nikon D800E Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Nikkor 50mm f/1.4G +3 more
racehorse in the desert Veteran Member • Posts: 4,103
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

If you do a search for 16-45 in this forum you will find that the owners, myself included, are very happy with and impressed with the lens. I would clearly recomment the 16-45.
--
John Power
Racehorse in the desert

'Life is too short to miss out on photography.'

ido Regular Member • Posts: 365
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

my opinion is that Pentax 16-45 the best in range 15 to 50 despite its a bit slower

hugnut Senior Member • Posts: 1,059
Just to be different...

I like to point out that the 16-45 is limited when using the internal flash from about 16-28, the extened barrel will get in the way and leave a shadow in your picture, I also noticed on mine that most of the pictures were a stop or two darker then compared to my Pentax primes and Sigma 18-50. I sold mine a while ago...but wouln't mind having one back some day for the sharpness and I would learn to deal or compensate with the underexposure tendency. Last fall when I was looking to upgrade my Sigma 18-50 I was torn between getting aonther 16-45(despite it's issues) or another Penatx zoom model...I eventually went with a couple primes instead and replced the Sigma with the Pentax 18-55.

ido wrote:

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

my opinion is that Pentax 16-45 the best in range 15 to 50 despite
its a bit slower

-- hide signature --

Marc Delghust Junior Member • Posts: 40
wide angle Pentx 16-45;18-55 Sigma 18-50

I am planning to buy a D-slr, and wide-angles are an important issue for me as I mostly tend towards architecture and landscape photography.

So I was wondering how they compare, and also on distorion (probably mostly on barrel distorion at wide-angle).
Are their other issues besides the flash-problem.

distortion, vignetting or sharpness (and eventually price-worthy)?
Pentax 16-45 ; 18-55 (standard kit lens)
Sigma 18-50

hugnut wrote:
I like to point out that the 16-45 is limited when using the
internal flash from about 16-28, the extened barrel will get in the
way and leave a shadow in your picture, I also noticed on mine that
most of the pictures were a stop or two darker then compared to my
Pentax primes and Sigma 18-50. I sold mine a while ago...but
wouln't mind having one back some day for the sharpness and I would
learn to deal or compensate with the underexposure tendency. Last
fall when I was looking to upgrade my Sigma 18-50 I was torn
between getting aonther 16-45(despite it's issues) or another
Penatx zoom model...I eventually went with a couple primes instead
and replced the Sigma with the Pentax 18-55.

ido wrote:

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

my opinion is that Pentax 16-45 the best in range 15 to 50 despite
its a bit slower

Godfrey Forum Pro • Posts: 29,413
Re: wide angle Pentx 16-45;18-55 Sigma 18-50

When I bought the *istDS, the new lens I bought with it was the DA14/2.8. My experience with it has been very satisfactory: very good even wide open, excellent by f/4-f/5.6, minimal distortion and excellent rendering throughout.

Others have stated that they felt the DA16-45 is even sharper at 16mm. I don't know yet as I haven't had one to compare against, but I'm thinking of adding one to my kit as the focal length range is right in the sweet spot for me. It's about the only zoom I'd use much. The flash "problem" is a non-issue for me: I always use an external flash for any wide angle lens, there's too many limitations with the built-in flash.

The DA18-55 seems a very good performer for a kit lens, although f/5.6 at 55mm is a bit slow for my uses. I'm sure the DA16-45 is a superior lens.

I don't buy Sigma lenses ... I've had too many problems in the past with them and never kept one.

Godfrey

Marc Delghust wrote:

I am planning to buy a D-slr, and wide-angles are an important
issue for me as I mostly tend towards architecture and landscape
photography.
So I was wondering how they compare, and also on distorion
(probably mostly on barrel distorion at wide-angle).
Are their other issues besides the flash-problem.

jnrob Regular Member • Posts: 316
16mm vs 18mm for WA photography ?

Hi,

I am planning to get a DS and would like to know whether there is a significant FOV difference at those focal lengths (I am considering the kit lens or the 16-45).

I am interested in taking WA photos in which the subject´s foreground and close surroundings are brought into the pic. That would apply to landscapes, urban scenes and portraits. I do not have any WA experience and have tried to look at pbase pics but with all the different formats (film, FF, 1.5x, 1.6x) it is hard to get an idea. So I would appreciate if anyone could comment on this.

Thanks,

Noel

Godfrey Forum Pro • Posts: 29,413
Re: 16mm vs 18mm for WA photography ?

jnrob wrote:

I am planning to get a DS and would like to know whether there is a
significant FOV difference at those focal lengths (I am considering
the kit lens or the 16-45).

You can create photographs with a "wide angle perspective" using a DS and nearly any lens shorter than a 24mm focal length. I'd reach for a 14mm, myself, but it's not required ... I just happen to prefer an extreme wide field when I'm working with such compositions, it seem whatever lens returns me a 90 degree diagonal field of view is what I'm after. Unfortunately, the only way to know which one does the right thing for you is to buy one and work with it for a while, see what your compositions do.

I've listed below a field of view table for lenses from 14mm to 20mm on the D/DS. Between 16mm and 18mm is about a 7 degree diagonal difference. With this you have some data to work with...

Godfrey

*istD/DS format approx:
-----------------------
Width = 16 mm
Length = 24 mm
Diagonal = 28.84 mm

"f" below is the Focal Length.
Field of View is in degrees.

f - Hor - Vert - Diag
---------------------------
14.0 - 81.2 - 59.4 - 91.7
15.0 - 77.3 - 56.1 - 87.7
16.0 - 73.7 - 53.1 - 84.0
17.0 - 70.4 - 50.4 - 80.6
18.0 - 67.3 - 47.9 - 77.4
19.0 - 64.5 - 45.6 - 74.4
20.0 - 61.9 - 43.6 - 71.5

jnrob Regular Member • Posts: 316
Re: 16mm vs 18mm for WA photography ?

Godfrey, thanks for the feedback,

I understand there is not much of a difference of an angle difference between 16mm and 18mm; I guess I wonder whether in practice it does make a difference. If not I prefer the lesser weight/bulk and longer reach of the 18-55 kit lens. Somewhere I read that WA gets interesting at 24mm full frame (so 16mm for the DS).

Thanks also for posting the angle data. For that purpose I actually use this freeware program that you might know of:
http://tangentsoft.net/fcalc/

Godfrey Forum Pro • Posts: 29,413
Re: 16mm vs 18mm for WA photography ?

jnrob wrote:

I understand there is not much of a difference of an angle
difference between 16mm and 18mm; I guess I wonder whether in
practice it does make a difference.

Of course it does, but the bigger difference is made by the photographer's eye. To me, anything from about a 35mm lens in 35mm film cameras on down is "wide angle" and you can do a lot with any of them. I tend to like ultrawide more, that's all.

Thanks also for posting the angle data. For that purpose I actually
use this freeware program that you might know of:
http://tangentsoft.net/fcalc/

I've owned that for years for my Palm, but the list I generated for you with one of the on-line calculators. I hardly ever use it on the Palm anymore as I don't usually worry about the numbers in the field ... You get used to the field of view you have with the lenses you're carrying, and work compositions from that perspective.

Godfrey

Rick Ashford Senior Member • Posts: 1,008
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

I opted for the Sigma 18-50 f2.8 DC EX over the Pentax 16-45. Primarily, I did so because of what I had read about vignetting and lens shadow issues using the 16-45 with the DS onboard flash. These are non-issues with the Sigma lens. Plus, this Sigma lens received a very favorable rating from tests done by Popular Photogaphy magazine compared to the Pentax 16-45. And I wanted the extra lens speed. And I must admit, I really like being able to zoom the full range of this lens from 18mm to 50mm at f2.8. I'm sure the Pentax 16-45 is an excellent lens. But so is the Sigma 18-50 f2.8. They both have their strong points -- and they both have their weaknesses. I don't think you can go wrong with either one.

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

-- hide signature --
Howard Contributing Member • Posts: 705
Re: wide angle Pentx 16-45;18-55 Sigma 18-50

Marc,

I use the *istD and the 16-45DA for commercial ship interior and exterior photography. I would be lost without the flexibility of this lens when doing this work. The metering tends to be 1/2 stop under exposed but I shoot Raw all the time and adjust afterwards with Photoshop CS. Based on your needs, in my book, this lens will be very worthwhile.

Howard
Cruise and Ferry Information

Marc Delghust wrote:
I am planning to buy a D-slr, and wide-angles are an important
issue for me as I mostly tend towards architecture and landscape
photography.
So I was wondering how they compare, and also on distorion
(probably mostly on barrel distorion at wide-angle).
Are their other issues besides the flash-problem.

distortion, vignetting or sharpness (and eventually price-worthy)?
Pentax 16-45 ; 18-55 (standard kit lens)
Sigma 18-50

hugnut wrote:
I like to point out that the 16-45 is limited when using the
internal flash from about 16-28, the extened barrel will get in the
way and leave a shadow in your picture, I also noticed on mine that
most of the pictures were a stop or two darker then compared to my
Pentax primes and Sigma 18-50. I sold mine a while ago...but
wouln't mind having one back some day for the sharpness and I would
learn to deal or compensate with the underexposure tendency. Last
fall when I was looking to upgrade my Sigma 18-50 I was torn
between getting aonther 16-45(despite it's issues) or another
Penatx zoom model...I eventually went with a couple primes instead
and replced the Sigma with the Pentax 18-55.

ido wrote:

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

my opinion is that Pentax 16-45 the best in range 15 to 50 despite
its a bit slower

 Howard's gear list:Howard's gear list
Canon EOS 6D Canon EF 50mm f/1.4 USM Canon EF 85mm f/1.8 USM Canon Extender EF 1.4x II Canon EF 70-200mm F4L IS USM +4 more
Marc Delghust Junior Member • Posts: 40
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

Does anybody know something about the 18 - 125 mm F 3.5-5.6 DC ?

Although it isn't really one from the same category, maybe it could be interested.
It's like a 28-200, the overall lens for the 35mm-SLR.

But I'm afraid of what would come out from tests, especially at wide-angle, as mostly performance tend to regress when zoomratios extend, especially the distortion the vignetting.

Rick Ashford wrote:
I opted for the Sigma 18-50 f2.8 DC EX over the Pentax 16-45.
Primarily, I did so because of what I had read about vignetting and
lens shadow issues using the 16-45 with the DS onboard flash.
These are non-issues with the Sigma lens. Plus, this Sigma lens
received a very favorable rating from tests done by Popular
Photogaphy magazine compared to the Pentax 16-45. And I wanted the
extra lens speed. And I must admit, I really like being able to
zoom the full range of this lens from 18mm to 50mm at f2.8. I'm
sure the Pentax 16-45 is an excellent lens. But so is the Sigma
18-50 f2.8. They both have their strong points -- and they both
have their weaknesses. I don't think you can go wrong with either
one.

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

Joele Veteran Member • Posts: 4,633
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

check here:

http://forums.dpreview.com/forums/read.asp?forum=1036&message=12164248

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Joel - *ist DS

 Joele's gear list:Joele's gear list
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Brett St Pierre
Brett St Pierre Veteran Member • Posts: 7,025
Re: 16mm vs 18mm for WA photography ?

These are from a number of weeks ago when we were comparing the DA16-45 to DA 14/2.8 and Zenitar 16/2.8 Fisheye. It will give you an idea of real world angle of view. Sorry the 18-55 isn't amoung them but you can see the difference 2mm makes (on *istD)

DA 14mm

DA 16-45 at 16mm

Tamron SP17mm

-- hide signature --

Brett

The Journey is the Thing

 Brett St Pierre's gear list:Brett St Pierre's gear list
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thw Veteran Member • Posts: 8,089
Thanks Brett for the pics...

never realize that 2 mm wide makes such a huge difference.

Wally OZ Veteran Member • Posts: 5,194
Sigma 18-50mm f2.8 EX DC sample pics

I know nothing about the 16-45 but I have recently acquired an 18-50 2.8 DC, Ok it's taken using a Nikon D70 body but results should be equal on *istD/s

Here are a couple of samples at f2.8 in this thread

http://forums.dpreview.com/forums/read.asp?forum=1036&message=12160834

Pics of the actual lens here

http://forums.dpreview.com/forums/read.asp?forum=1030&message=12142318

CSLee wrote:

i m planing to buy one of these lens but don't know which one is
better in term of performance (focusing
speed/accurate,sharpeness,contrast and etc.).can anyone please help
me ,i m lose ?.

jnrob Regular Member • Posts: 316
Thanks for the pics too

It makes me think that the extra 2mm difference is definitely worthy.

Joseph Tainter Forum Pro • Posts: 10,399
Re: Sigma 18-50mmf2.8 or Pentax 16-45mm to buy???

"Plus, this Sigma lens received a very favorable rating from tests done by Popular Photogaphy magazine compared to the Pentax 16-45."

Has Pop Photo tested the Sigma 18-50 f2.8? I don't recall seeing it. I know they have not yet reviewed the DA 16-45.

While I am writing, I have to wonder why my DA 16-45 does not underexpose?

Joe

Godfrey Forum Pro • Posts: 29,413
Re: 16mm vs 18mm for WA photography ?

Brett, you're going to cost me money. The thought of a DA16-45 addition to my lens kit is beginning to buzz in my head.

Godfrey

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