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01-20-2015, 02:53 PM   #1
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Anyone using the Sigma 50-500 w/Pen Q ?

Is anyone using the Bigma with the Pentax Q?
I'm using the lesser 170-500 with good results but sometimes I want less focal length than the 170 starts at........I've had a few of the Bigma's in the past but don't have one currently (eyeing one on eBay)........any sample photos?
Thanks guys- looking forward to the sample photos~
Cheers~~~~

01-20-2015, 03:31 PM   #2
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I have. The results IMO unfortunately aren't great, since not only isn't the base sharpness a good match such small photosites , but by the time you hit the Bigma's Sweet Spot around f/8, diffraction effects are kicking in on the Q,
01-20-2015, 03:48 PM   #3
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DCS why do you think the 170-500 does well and not the Bigma?
Are you a Kodak DCS shooter?

Could you possibly have a less than perfect lens?
01-21-2015, 09:02 AM   #4
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I'm surprised more members are not using this combo.....I guess the 300 DA lens has the monopoly on good telephoto images.

01-22-2015, 06:16 AM   #5
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Ha, no, I lived in DC when I opened the account. AFAIK, my sample of the Bigma is fine, as it performs as advertised on APS-C DSLR. I imagine that diffraciton is a large part of it, as sharpness peaks at f/4 on the Q sensor, and the Bigma when zoomed out has a max aperture of 5.6 and doesn't really get sharp itself until you close it down a couple of stops.


QuoteOriginally posted by SteveNunez Quote
DCS why do you think the 170-500 does well and not the Bigma?
Are you a Kodak DCS shooter?

Could you possibly have a less than perfect lens?
01-22-2015, 06:42 AM   #6
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dcshooter, why do you think the 170-500 produces very good images when it's a lower spec version of the 50-500~ (slower f stop and lower end optics)?
I've owned several of the 50-500's in years past but didn't couple it to a Q......now I've been considering picking one up due to the 50mm start as opposed to the 170mm start.....was hoping someone would have had a good experience with one.
I do recall my 50-500 was a bit soft at over 400mm wen used on my Canon EOS 1D Mk II N years back.......but that could have been my particular unit.

Thanks for the reply.
01-22-2015, 07:56 AM   #7
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I use both the Da300 and Bigma.
I prefer the IQ of the 300 so that is what I use the most.
With the Q and adapted I strive to get shots that look like they were made with a larger sensor cam.
I can get that quality with the 300, but not so much with the Bigma.

The one area the zoom out of Bigma comes in handy for me is in Q wildlife video, because if a critter is moving around it goes out of frame too easily with the 300.
For video IQ is less of an issue.

---------- Post added 01-22-15 at 06:59 AM ----------

For when I want excellent IQ and zoom ability I prefer using the Sigma 70-200os.
The image quality over the entire range is similar to the 300, and you can keep the aperture below diffraction range.

---------- Post added 01-22-15 at 07:03 AM ----------

For sample photos check the adapted lenses index in the sticky above.

---------- Post added 01-22-15 at 07:11 AM ----------

Hmmm looks like I haven't posted a sample with the Q7 on the Bigma, only with Q.
I may need to go out and do some testing when I have a minute.
The Q7 forgiveness on diffraction may improve the results.

Last edited by crewl1; 01-22-2015 at 08:01 AM.
01-22-2015, 10:49 AM   #8
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Crewl if you do test with Q7 might you post here, I'd like to see the results.....thanks.

01-23-2015, 01:37 PM   #9
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Did some testing today.
The first set was run at ISO 100 with the adapter set at position 2, so depeneding on zoom position it was adding 2 stops for hopefully best sharpness from the lens.
A little further down I ran a test of various aperture settings at 500.

Here is a picture of the target distance, the grey spot on the right of the island across the water is a GBH and there are a few Night Herons to the left.


Bigma at 500


Bigma at 400


Bigma at 300


Bigma at 200


Bigma at 100


Bigma at 50


---------- Post added 01-23-15 at 12:39 PM ----------

The wider settings seemed blurry at this distance. At 3/4/500 things got better.

Next is a test of various aperture settings at 500mm.

---------- Post added 01-23-15 at 12:49 PM ----------

Here are approx 100% crops of the shots at 500mm using various aperture settings.

Wide Open - soft


1 Stop - best


2 Stop - starts to show diffraction


3 Stop - diffraction is severe

Last edited by crewl1; 01-23-2015 at 01:51 PM.
01-23-2015, 01:54 PM   #10
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QuoteOriginally posted by crewl1 Quote
Did some testing today.
The first set was run at ISO 100 with the adapter set at position 2, so depeneding on zoom position it was adding 2 stops for hopefully best sharpness from the lens.
A little further down I ran a test of various aperture settings at 500.

Here is a picture of the target distance, the grey spot on the right of the island across the water is a GBH and there are a few Night Herons to the left.


Bigma at 500


Bigma at 400


Bigma at 300


Bigma at 200


Bigma at 100


Bigma at 50


---------- Post added 01-23-15 at 12:39 PM ----------

The wider settings seemed blurry at this distance. At 3/4/500 things got better.

Next is a test of various aperture settings at 500mm.

---------- Post added 01-23-15 at 12:49 PM ----------

Here are approx 100% crops of the shots at 500mm using various aperture settings.

Wide Open - soft


1 Stop - best


2 Stop - starts to show diffraction


3 Stop - diffraction is severe
This is definitely informative.
Thanks!

Just to be sure I understand correctly, the bigger the number, the smaller the effective lens opening
(i.e., 3 is a smaller effective opening through the lens than 2 is)
01-23-2015, 02:00 PM   #11
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In retrospect I should have taken the focal length samples at the 1 stop setting, but at very least you can see the amount of real estate that is captured.

Here is a comparison of the Bigma at 300mm 1 stop setting vs the DA*300 at 1 stop setting.
Both are cropped to approx 100%

Bigma


DA*300 (You can see why I don't use the Bigma for this application much. The Sigma 70-200OS yields similar results to the DA*300.)
01-23-2015, 02:05 PM   #12
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QuoteOriginally posted by reh321 Quote
This is definitely informative.
Thanks!

Just to be sure I understand correctly, the bigger the number, the smaller the effective lens opening
(i.e., 3 is a smaller effective opening through the lens than 2 is)
Yes with the Pentax adapter each number on the dial corresponds to one click of the aperture dial. I think this is approximate, but it gives you something to return to after you experiment to find your best aperture.
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01-23-2015, 02:42 PM   #13
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QuoteOriginally posted by crewl1 Quote
In retrospect I should have taken the focal length samples at the 1 stop setting, but at very least you can see the amount of real estate that is captured.

Here is a comparison of the Bigma at 300mm 1 stop setting vs the DA*300 at 1 stop setting.
Both are cropped to approx 100%
Bigma
DA*300 (You can see why I don't use the Bigma for this application much. The Sigma 70-200OS yields similar results to the DA*300.)
This stuff is very good!

I guess I'll have to wait for spring for some relatively sedentary water fowl to return here. Right now, systemmatic testing like this is very hard for me, because birds around right now are hardly ever in the same spot for more than a couple of seconds.
01-23-2015, 03:24 PM   #14
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QuoteOriginally posted by reh321 Quote
This stuff is very good!

I guess I'll have to wait for spring for some relatively sedentary water fowl to return here. Right now, systemmatic testing like this is very hard for me, because birds around right now are hardly ever in the same spot for more than a couple of seconds.
We have lots of those hyper birds too. Sometimes a turtle will do for testing, or even a No Parking sign down the street if things get real desperate.
01-23-2015, 04:38 PM   #15
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Thank you Crewl, very kind of you to take the time to do this and post- thumbs up!

I see what you mean by soft images- that DA300 is a beast- awesome image quality at distance!

I think your sample of the Bigma is a bit soft- I've owned a few- maybe 4 and I had 1 that was very sharp- the others were soft- so I know there's some variance from lens to lens samples......I think my current particular 170-500 Sigma is actually a good one......even on my full frame Sony A7 it produces nice images- not stellar but good.

Thanks again for this~ very appreciative of your time and energy in doing this.
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