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09-08-2007, 03:04 PM   #1
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Sigma 70-300 vs Pentax 75-300

Hi,

I didn't want to overtake the other Sigma thread b/c my thoughts vary differently.

I was looking at this lense today, actually mounted on my k100D at a store, testing it outside.

I'm wondering if anyone else has seen what I notice (or, at least, seem to notice) - the photos from the Sigma lense are slightly overexposed compared to my 50-200 pentax lense. It was also overexposed compared to the Pentax 75-300 lense I tried (PENTAX FAJ 75-300MM F4.5-5.8).

The Sigma runs $319 CDN and the Pentax 75-300 is $249.99 CDN so i'm wondering if there are comparisons between the 2? I was told the Pentax is simply 'left over' from the 35mm film 'era' so it works of course and that is why the price is lower.

I really want to get into the 400/500 stage (alot of wildlife shots), BUT the cost for stabilization is too much for me right now.

I did notice a bit of difference b/n the 50-200 which came with the kit and they will let me trade it in so i'm spending too much. The only slight bummer is that I'd need to get new uv and polarization filters b/c the 300's are 58mm and the other one is 52mms.

Thoughts?
Cheers,
Keebler

09-08-2007, 08:19 PM   #2
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QuoteOriginally posted by Keebler Quote
Hi,

I didn't want to overtake the other Sigma thread b/c my thoughts vary differently.

I was looking at this lense today, actually mounted on my k100D at a store, testing it outside.

I'm wondering if anyone else has seen what I notice (or, at least, seem to notice) - the photos from the Sigma lense are slightly overexposed compared to my 50-200 pentax lense. It was also overexposed compared to the Pentax 75-300 lense I tried (PENTAX FAJ 75-300MM F4.5-5.8).

The Sigma runs $319 CDN and the Pentax 75-300 is $249.99 CDN so i'm wondering if there are comparisons between the 2? I was told the Pentax is simply 'left over' from the 35mm film 'era' so it works of course and that is why the price is lower.

I really want to get into the 400/500 stage (alot of wildlife shots), BUT the cost for stabilization is too much for me right now.

I did notice a bit of difference b/n the 50-200 which came with the kit and they will let me trade it in so i'm spending too much. The only slight bummer is that I'd need to get new uv and polarization filters b/c the 300's are 58mm and the other one is 52mms.

Thoughts?
Cheers,
Keebler
just wanted to add that I figured out the reason why the Sigma was overexposed or not looking properly..... it didn't have the UV filter on whereas mine did. i think that may be the difference.
09-08-2007, 10:10 PM   #3
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i have a lens that is 'faster' than the others

consider taking that lens into a darker situation. wouldnt you like that extra light?
09-08-2007, 10:54 PM   #4
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QuoteOriginally posted by MJB DIGITAL Quote
i have a lens that is 'faster' than the others

consider taking that lens into a darker situation. wouldnt you like that extra light?
Hi,

It might be b/c it's 2 a.m. here, but i don't quite understand what you mean?

09-09-2007, 02:26 PM   #5
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bumpty bump bump?

any thoughts folks?
09-09-2007, 07:35 PM   #6
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I don't have either (I have the Tamron 70-300), but from what I've heard, the Pentax 75-300 is vastly inferior to the Sigma 70-300 APO (not sure about the non-APO) and the Tamron 70-300.
09-10-2007, 12:09 PM   #7
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QuoteOriginally posted by Entropy Quote
I don't have either (I have the Tamron 70-300), but from what I've heard, the Pentax 75-300 is vastly inferior to the Sigma 70-300 APO (not sure about the non-APO) and the Tamron 70-300.
Thanks Entropy. I'm going to test the sigma again tomorrow and ask them to put a UV filter. My 1st test wasn't apples to apples as it didn't have the UV on so it wasn't fair.

If that goes well, I'll buy it. I'm really excited to try the macro feature out. Neat to think of doing macro without standing inches above something

Thanks for taking the time to respond...much appreciated.

Cheers,
Keebler
09-12-2007, 06:07 PM   #8
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BTW, it's easy enough to correct for small exposure errors, it's not easy to correct for insufficient sharpness or just plain shoddy lens build quality, which are the main complaints against the Pentax 75-300.

Also, the Pentax LCD preview is definately not a good way to determine exposure correctness unless you're seeing indications in the viewfinder of blown highlights. To really compare you'd have to take some shots in the exact same lighting from the same position and then compare the PEFs with the same raw converter at the same settings.

09-13-2007, 06:36 AM   #9
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thanks folks. I ended up buying the Sigma 70-300 f4-5.6 APO DG Macro lens.

I've been playing with it, experimenting different shots.

I do notice that at the longer end, the 'bokeh' is really evident or pronounced.
I'll keep snapping different shots for the fun of it.

Cheers,
keebler
09-13-2007, 07:34 PM   #10
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I have had the Sigma 70-300 DG APO for a couple of months and this lens can produce some amazing macro photos. I might post a bug shot or two later.

A couple of qualms I have about it:

* how difficult it is to do manual focusing without having it "slip" up or down as you move your hands trying to support the lens/camera. Sure a tripod would be nice, but I doubt a bee or fly would hand around while you set up

* how razor thin is the focusing in macro mode. At macro mode in manual mode, it doesn't take much to be out of focus. Last thing I want is the lens helping make that more difficult by being so sensitive.
09-13-2007, 09:43 PM   #11
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I have an older Sigma 75-300mm APO, and love it.
Although I'm not using it very often at the moment.

Have fun with your new lens
09-16-2007, 01:17 PM   #12
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QuoteOriginally posted by Frogroast Quote
I have had the Sigma 70-300 DG APO for a couple of months and this lens can produce some amazing macro photos. I might post a bug shot or two later.

A couple of qualms I have about it:

* how difficult it is to do manual focusing without having it "slip" up or down as you move your hands trying to support the lens/camera. Sure a tripod would be nice, but I doubt a bee or fly would hand around while you set up

* how razor thin is the focusing in macro mode. At macro mode in manual mode, it doesn't take much to be out of focus. Last thing I want is the lens helping make that more difficult by being so sensitive.
These are basically problems common to any macrophotography setup, independent of who made the lens.
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