Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Pentax / Samsung dSLR, K Mount Mirrorless

Reply
 
Thread Tools Search this Thread
Old Oct 16, 2006, 2:43 PM   #1
Senior Member
 
Join Date: Mar 2006
Posts: 373
Default

I am looking hard for a replacement for the 18-55mm lens my K100D came with due to the zoom range limitation.
Although I searched and read as much as I could about the Sigma 18-125mm, I still have a number of questions that you might be able to answer:
1. Can it be used with the built-in flash on K100D (fill flash etc)?
2. Comparing it with Sigma 17-70mm lens: what is the widest aperture at around 70mm?
3. How is the bokeh, if any?
4. Are you disappointed with it?
Thanks
DigitalAddict is offline   Reply With Quote
Sponsored Links
Old Oct 16, 2006, 7:12 PM   #2
Senior Member
 
jsiladi's Avatar
 
Join Date: Jan 2005
Posts: 587
Default

Can't help you with actual answers but maybe these can answer a couple (if you haven't already seen them)..

http://www.fredmiranda.com/reviews/s...=37&page=1

http://www.pbase.com/cameras/sigma/1...5-56_dc_if_asp
jsiladi is offline   Reply With Quote
Old Oct 16, 2006, 7:52 PM   #3
Senior Member
 
Join Date: Dec 2002
Posts: 207
Default


I use the Sigma 18-125 as my primary lens and it does very well for me. To see some photos from our recent trip to Niagara Falls (before the snow) go to this link. http://www.stevesforums.com/forums/view_topic.php?id=105269&forum_id=80. There is a forth photo as the last post so don't miss it.
rritter is offline   Reply With Quote
Old Oct 16, 2006, 9:13 PM   #4
Senior Member
 
Join Date: Mar 2006
Posts: 373
Default

Seen those reviews already: I guess I am getting greedy and want the ideal walkaround lens.

I found this one useful as well: http://www.photodo.com/product_1122.html

Looking at this table http://www.dcviews.com/lenses/Pentax-lenses.htm
and comparing the Sigma 18-125 in physical size with
the smc PENTAX-FA 28mm-105mm F4-F5.6 [IF] it looks like it might be possbile to use
it with the built-in flash (for some focal lengths at least).

rritter,
Nice shots for sure: it goes to show that is the photographer that matters....:-)


DigitalAddict is offline   Reply With Quote
Old Oct 16, 2006, 9:58 PM   #5
Senior Member
 
nadnerb's Avatar
 
Join Date: Aug 2005
Location: Bath, UK
Posts: 319
Default

1. I have this lense and I've never had any problems using the flash
2. I've never used the 17-70mm so I can't help here
3. This was taken at 125mm f5.6 1/250 sec


4. Since this is my first zoom lense, I have nothing to really compare it with. (Only primes) There is some distortion on the wide end which sometimes I find annoying.
I also wish it was a bit faster

Overall it's a good lense, with a decent range
nadnerb is offline   Reply With Quote
Old Oct 17, 2006, 12:38 PM   #6
Senior Member
 
Join Date: Mar 2006
Posts: 373
Default

Thanks much for your answers: it helps a lot.
I will order one tonight. Once I have it in my hands, I will do some comparison with the 18-55mm kit lens and post my findings here.

DigitalAddict is offline   Reply With Quote
Old Nov 10, 2006, 4:53 PM   #7
Senior Member
 
Join Date: Mar 2006
Posts: 373
Default

This might be useful for those looking into upgrading to Sigma 18-125mm.

- Image quality: same as DA 18-55mm for the overlapping range (good and bad). It vignettes at 125mm.

- Aperture throughout zoom range
18-19mm: F3.5
20-29mm: F4
30-69mm: F4.5
70-125mm: F5.6

Compare that with DA 18-55mm
18-19mm: F3.5
20-34mm: F4
35-49mm: F4.5
50-55mm: F5.6

- Built-in flash compatibility: works great even when fully extended

- Zoom ring: it goes in large steps, almost 10mm at the high end (e.g. 98, 108 etc)

Bottom line: it is a nice replacement for the DA 18-55mm kit lens but nothing more.
It is great for outdoor shots. On the other hand, the DA 18-55mm is cheap and lightweight.

P.S. This being the longest focal length I own, I was shocked at the minuscule difference in viewfinder when going from 100mm to 125mm. I guess a 105mm lens would have done it.


Here is a picture of both while extended:

DigitalAddict is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 12:27 AM.