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01-20-2007, 12:58 AM   #1
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Sigma 28-200 DG/K10d

Hello to fellow pentax fans from the "land down under"
I have just registered so I am a little green at all the technical jargon.
However, I have just become the proud owner of a K10d,(brilliant) am using a rather dated 28-300 Sigma and not achiving a great result, and am interested in adding a Sigma 28-200 DG lens, instead. Am I looking in the right direction. I am a keen macro photographer, having been a Pentax user for about 20 years. Whats the difference between DG and DC lens. Which is preferable.
Would appreciate any advice.

01-20-2007, 07:04 AM   #2
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Hi Bramela,

Welcome to the forums.

From what I understand, the DG lenses are designed to work with both film and digital cameras. So if you have an older film camera that you still like to use, you can buy one of these lenses and use them on your K10D and your older camera. The only thing you would notice is the field of view crop factor. To convert, multiply your number by 1.5, so 28mm (35mm measurement) on a digital camera would look result in a 42mm. You compare the result if you still have a film camera.

The DC series, on the other hand, are designed to be used totally on a digital. If you bolt a DC series lens onto a film camera, you would get severe vignetting or a clipped (for lack of a better term) image. Again, lens ranges are given in 35mm terms, so take into account the field of view crop.

I haven't tested out a 28-200 DG yet but it should be very slightly faster at 200mm than the 18-200 DC I've seen. The 18-200 DC is a decent general purpose lens. Indoors, I would be using a lot of flash at longer focal lengths because of the higher aperture values beyond 135mm (6.3 at 200mm for 18-200 DC vs 5.6 for the 28-200 DG).

Hope this helps.

Last edited by Alvin; 01-20-2007 at 07:10 AM.
01-20-2007, 08:47 AM   #3
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I am using the Sigma 28-300 DG as my "traveling" lens . . . always have my K10D with me . . . minimum focusing distance is about 20cm at 300mm (equivalent of 450mm) with a magnification ratio of 1.3. Very pleased with this lens . . . the bang for the buck is hard to beat.
If you like I'll try to post a few shots later.
01-20-2007, 02:29 PM   #4
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Sigma 28-200 DG

Many thanks, as I am looking a general purpose lens, with macro, I think I will go with this lens. Problem being I am on a limited budget, (to keep the better half happy)
Appreciate your advice.:

01-20-2007, 03:25 PM   #5
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Sorry if this post is a bit too late.

DC in general is quite good in IQ, better than DG lenses on digital SLR bodies.

Sigma 28-200 has the same problems with other big zooms. Images will not be as sharp wide open at two extreme focal lengths. The colour can be compromised with wash-out colour beyond 135mm.

This is still a reasonable lens for general purpose covering all focal lengths but you paid what you got for for quality.

Sure this is a good lens to start with and you will know what other lenses youy will need in future ...
01-21-2007, 03:47 AM   #6
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No not too late roentarre.
Thanks for your thoughts. What would you suggest instead.
Perhaps 17-70 DC macro, and another longer lens ??
I am a little in new ground here and open to any suggestions.
01-21-2007, 04:47 AM   #7
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Hi Bramela. Sorry about my last post full of spelling mistakes there.

Since you enjoy macro shots a lot, why not have a dedicated macro instead?

Not too sure what your budget is. But if you are really more dedicated into macro, why not pick up D Fa 50mm macro or D Fa100mm macro with plenty of examples shown in the "post a pic" section. 50mm macro for floral close up or general purpose. 100mm with some extension tube for some insect macros perhaps. (I am having D FA 100mm on order from US and Fa 50mm from ebay)

Examples of Asad's D Fa 50mm

https://www.pentaxforums.com/forums/post-your-photos/1947-dfa50mm-f2-8-1-1-macro-lba-thread.html

There is a flourishing introduction of Sigma DC lenses covering various standard focal lengths with increasingly fast apertures. Generally all these DC zooms with f2.8 exhibit great MTF (by canon standards) and fantastic colour rendering. The major problem is that most people do move on to obtain other lenses in the end ( a trait of LBA or a question of "what images would I have if I have another lens like XXX?").

The sigma DC series with macro (not 1:1 though) are good; but the rumour I heard was the presumed popularity of macro demand among SLR photographers that sigma wants to jump into the game quickly to make some big bucks. Any sigma EX DC or DG with f2.8 would not be dissapointing as long as it is EX and f2.8 widest aperture.

Generally I would avoid big zooms. The exception might be Bigma 50-500mm which is still tad soft from 430mm onwards wide open. The colour is still brilliant despite some compromised sharpness. To warn you, sigma typically has soft edges regardless of the apertures...

Have you heard of new sigma 70mm macro? I think that is the sharpest lens sigma ever produced. To mind you, Sigma 150mm f2.8 was rated sharper than a lot of competition macros and this 70mm was rated sharper than 150mm.

Hope this helps.

Good luck

Last edited by roentarre; 01-21-2007 at 05:03 AM.
01-21-2007, 12:15 PM   #8
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Thanks a lot for all the great advice. I now have a fair idea what its all about and can proceed a bit more confidently. Many thumbs up to this extremely valuable forum and its contributors.
Happy snapping!!

01-21-2007, 12:48 PM   #9
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Bramela,

Keep sticking around in here. I find a ton of good posts and tips - I'm sure you'll find some too.

The people don't hesitate to help out others wherever they can too and don't embarrass (and if so, its just to poke some fun) while doing so.

Hope to see some pictures soon!
01-21-2007, 10:59 PM   #10
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Thanks Alvin and all.
I have uploaded three photographs as you mention. Sorry but doubling up on first (candlelight) that was my learner, we could say.
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