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05-09-2013, 09:33 PM - 1 Like   #421
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Depoe Bay, Oregon at super minus low tide

K-5 with Sigma 8-16 at 16mm and f13




Last edited by civiletti; 07-08-2013 at 10:51 PM. Reason: pic
05-19-2013, 05:02 AM   #422
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Had a nice walk on the beach this afternoon:


Pentax K5IIs - Sigma 8-16mm f/4.5-5.6 ASPH DG
06-07-2013, 06:21 AM   #423
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I have had this lens on order from B&H for several weeks. It was supposedly backordered. Yesterday I received the cancellation of the order with the information that this lens is being discontinued by Sigma. I haven't confirmed this with Sigma; someone might want to do this. I assume they are only discontinuing the Pentax mount version. Grrrr! (Grabbed one off of Amazon, supposedly, but was hoping to have access to several in case I got a bad sample!)
06-07-2013, 06:58 AM   #424
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Old Niagara Falls (Canada) power plant..







06-15-2013, 02:42 AM   #425
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well I think I have found a solution to the problem of using filters with the Sigma 8-16mm f/4.5-5.6

By rummaging through boxes of loose assorted filters I managed to uncover a set of Tamron 30.5mm ND2X~8X filters that fit perfectly over the rear element of the Sigma 8-16mm* I attached this one using strong double sided tape. I have done some tests to confirm that it has no impact on the operation of my cameras, I'm aware of how little clearance there is in a pentax camera mirror box. But when I test this setup tomorrow hopefully there won't be any significant vignetting.

* these apparently belonged to a mirror lens, but I don't recall anyone in my family having ever owned one which makes the origin of these filters a rather curious thing.

Last edited by Digitalis; 06-15-2013 at 02:47 AM.
06-15-2013, 03:20 AM   #426
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QuoteOriginally posted by Digitalis Quote
well I think I have found a solution
That is awesome.
06-18-2013, 06:31 PM - 2 Likes   #427
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Malacca with sigma 8-16mm

06-18-2013, 07:47 PM   #428
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QuoteOriginally posted by dadipentak Quote
That is awesome.
Unfortunately this solution isn't as awesome as it sounds - perhaps the only thing awesome about it is how spectacularly the experiment failed. although physically there were no mechanical issues with the addition of the filter, the optical effects of it caused a rather spectacular focus shift in the lens- infinity focus was shifted much further forward than it should have been, close focus was reduced to 3 feet @8mm in addition to this, there was massive astigmatism in the corners of the frame caused by the addition of the rear mounted filter.

06-18-2013, 08:49 PM   #429
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QuoteOriginally posted by Digitalis Quote
Unfortunately this solution isn't as awesome as it sounds - perhaps the only thing awesome about it is how spectacularly the experiment failed. although physically there were no mechanical issues with the addition of the filter, the optical effects of it caused a rather spectacular focus shift in the lens- infinity focus was shifted much further forward than it should have been, close focus was reduced to 3 feet @8mm in addition to this, there was massive astigmatism in the corners of the frame caused by the addition of the rear mounted filter.
Yeah, but otherwise...;~)
06-19-2013, 04:29 AM   #430
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QuoteOriginally posted by Digitalis Quote
Unfortunately this solution isn't as awesome as it sounds - perhaps the only thing awesome about it is how spectacularly the experiment failed. although physically there were no mechanical issues with the addition of the filter, the optical effects of it caused a rather spectacular focus shift in the lens- infinity focus was shifted much further forward than it should have been, close focus was reduced to 3 feet @8mm in addition to this, there was massive astigmatism in the corners of the frame caused by the addition of the rear mounted filter.
Bugger ! nice try though had my hopes quite elevated there
06-19-2013, 05:01 AM   #431
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QuoteOriginally posted by Digitalis Quote
Unfortunately this solution isn't as awesome as it sounds - perhaps the only thing awesome about it is how spectacularly the experiment failed. although physically there were no mechanical issues with the addition of the filter, the optical effects of it caused a rather spectacular focus shift in the lens- infinity focus was shifted much further forward than it should have been, close focus was reduced to 3 feet @8mm in addition to this, there was massive astigmatism in the corners of the frame caused by the addition of the rear mounted filter.
Damn you Laws of Physics

I suppose thats why we can't have a light weight pocketable 6 - 1000 mm f/0.95
07-02-2013, 12:09 AM   #432
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QuoteOriginally posted by steve1307 Quote
I suppose thats why we can't have a light weight pocketable 6 - 1000 mm f/0.95
Haha, I'd like to see someone try to make a 6-1000mm f/0.95 even if it were allowed to be the size of a city!

Anyway, I'm here to tell you guys I just joined your club. My 8-16 turned up today
07-05-2013, 02:14 AM   #433
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Thanks everyone for such amazing pics... I'll buy my 8-16 tomorrow and ...can't wait ! Already had the 10-20 and the 12-24 but i need the extra 2mm for indoors photography.
Anyway, as i have a K-01 IR converted (665nm) i would like to know if anyone already tried the 8-16 in IR ?? I fear the hotspot issue...
Thanks again, i'll go to Japan in august and i imagine this lens to be on my K-5 90 % of the time !
Cheers
07-05-2013, 02:28 AM   #434
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QuoteOriginally posted by Jably Quote
i would like to know if anyone already tried the 8-16 in IR ?? I fear the hotspot issue...
I predict that hot-spotting will be rather problematic with a lens like this, Sigma coatings aren't that great at handling visible light as it is. Even the DA15mm f/4 can have considerable problems with flare and hot spots when used for IR.
07-05-2013, 02:43 AM   #435
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QuoteOriginally posted by Digitalis Quote
I predict that hot-spotting will be rather problematic with a lens like this, Sigma coatings aren't that great at handling visible light as it is. Even the DA15mm f/4 can have considerable problems with flare and hot spots when used for IR.
You're right. I had some issues with the 10-20 sigma (but less than the Pentax 12-24 DA !). I can confirm that the 31mm FA 1.8 is amazing in IR ! You could barrely see a hotspot at f13 !

But it would be awesome to have a 8mm landscape avoiding hotspots issues...
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