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07-22-2008, 02:59 AM   #1
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Sigma 100-300 APO vs New Pentax 300

Having seen some superb(sharpness, colour, contrast, bokeh) pics from both these lenses I am kinda deciding which one to purchase.

The zoom for me giving lots more options would seem to be the better buy.

Have really not researched mtf charts or price diffs and was hoping to have some real world application form the members of this forum.

I'm sure the photogs who have purchased the new Pentax 300 will defend their purchase vigorously - but was thinking it is really nice to have an option to zoom out to 100 for closer action on the fly.

cheers

Dylan

07-22-2008, 03:29 AM   #2
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QuoteOriginally posted by dylansalt Quote
...The zoom for me giving lots more options would seem to be the better buy...

I find zoom to be a must at longer focal lengths...
...and good at wide angle.

I could live with out it at midrange or portraits

(although zoom is still the best for walk around).
Primes are for special photography…
But that’s me …
07-22-2008, 06:36 AM   #3
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Depends on what you shoot. Prime lens advocates advise "zooming with your feet", but I prefer zooms because I often am on hiking trails where "zooming with my feet" would require rock climbing gear or breaking a few bones.
07-22-2008, 07:27 AM   #4
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1.for Pentax SMCP-DA* 300mm f/4 ED you need a teleconvector which dose not exist in market now-it makes a big problem if you whant take pictures of animals
2.you can use the lenses for macro photography (Pentax SMCP-DA* 300mm f/4 ED )
3.focus is faster and quality of image better with Pentax SMCP-DA* 300mm f/4 ED

i think that if you can wate till the prodaction of teleconverter i would buy Pentax SMCP-DA* 300mm f/4 ED

if you need the lenses today you may use teleconverter with manual focus or use other tele lensess

07-22-2008, 08:29 AM   #5
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QuoteOriginally posted by dylansalt Quote
The zoom for me giving lots more options would seem to be the better buy.
It really depends on the type of photo.

Case 1: You compose and shoot within the range 100 to 300. The zoom would win.

Case 2: You really need to shoot at 300mm and longer, possibly cropping into the shot. The prime would win. A cropped 50% 300mm prime probably is on par with a 200 - 500mm zoom lens at 500mm.
07-22-2008, 10:03 PM   #6
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i agree with falconeye. I have the f*300mm and doubt it will ever be sold. My next purchase will be a 70-200mm f2.8 for those close in shots. the total cost will exceed the sigma 100-300mm (an excellent lens) but provide more versatility (for me). Choose what meets your shooting style and adapt. Either lens will make you happy.
07-23-2008, 12:52 AM   #7
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I'd definitely go for the Pentax lens.
07-23-2008, 02:09 AM   #8
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QuoteOriginally posted by koper Quote
...for Pentax SMCP-DA* 300mm f/4 ED you need a teleconvector ... if you need the lenses today you may use teleconverter with manual focus or use other tele lensess
Yeap ... if you are shooting film.
If you shoot digital, I tend to find that photoshop is a better TC than any

07-23-2008, 08:51 AM   #9
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QuoteOriginally posted by gkopeliadis Quote
If you shoot digital, I tend to find that photoshop is a better TC than any
That depends. The statement is correct for a zoom lens. For an excellent prime lens at its sweet spot of max. MTF, there may be enough resolution headroom even with a 14.6 MP sensor to benefit from the optical magnification as provided by a TC. I plan to actually check this out.
07-24-2008, 04:37 AM   #10
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QuoteOriginally posted by gkopeliadis Quote
Yeap ... if you are shooting film.
If you shoot digital, I tend to find that photoshop is a better TC than any
That depends on the quality of the TC and the lens. I can hardly find, if any, image degradation when using the Pentax 1.4x-L tc with the Tamron 300/2.8 or the Pentax SMC-A 400/5.6 (though the latter is too slow for my taste). Even the Pentax 2x-L is so good, that in real world images, you won't see any IQ loss, unless you are searching for it.

Also dedicated TCs, like the Sigma Apo modells work very well with the matching lenses. In my case the Sigma 70-200/2.8 and the Sigma Apo 1.4x tc work very well together – clearly better than upscaling in PS. Even the 2x Apo tc is not as bad as people assume, who never actually used this combo.

Ben
07-24-2008, 05:44 AM   #11
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Does anybody have any info about the accuracy and speed of SIGmA 100-300 compared with Pentax 300 SMC-DA* ?!
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