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Forum: Lens Clubs
08-07-2020, 03:43 PM
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Many people aren't aware of how jungle-like a cornfield can be.
Around here, where the corn is tallest, roads seasonally become trails at the bottom of canyons with high cornstalk walls. When the corn is finally harvested the visibility of the horizon again in those locations is a startling and welcome surprise.
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Forum: Lens Clubs
12-22-2019, 07:11 PM
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Recently I found a Takumar lens with the couple of interesting "accessories" attached: an M42 to Sony E-mount adapter and a Sony NEX-5 camera. Purchasing it gave me another way of using my Pentax and other m42 lenses, and with a PK to Sony-E adapter on the way, soon it will be another way to use all of my manual focus K-mount lenses, too.
However, I thought it would be nice to get just one auto-focus E-mount lens to use on occasion with the NEX-5, if I want to explore some of its more automatic features. And since the Sony E-mount kit zooms seem to have a lot of limitations, I went for a Sigma A f/2.8 30mm prime with the E-mount. Here a few early shots taken with it. Most of these are shot between f/2.8 and 5.6.
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Forum: Lens Clubs
07-28-2019, 06:13 PM
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I understand, sometimes I, too, have to give myself a dope-slap.
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Forum: Lens Clubs
07-05-2019, 05:46 AM
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Does it benefit from a hood?
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Forum: Lens Clubs
07-04-2019, 05:44 AM
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By "flat," I take it that you don't mean "flat-field." Can you say more about what you do mean?
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Forum: Lens Clubs
01-10-2019, 03:05 PM
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Sigma UC f4-5.6 24-50mm MC Zoom + Pentax K-R
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Forum: Lens Clubs
12-26-2018, 06:32 PM
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Some of my first shots with a used Sigma f4-5.6 70-300mm DL Macro Super auto-focus lens that are also some of my first shots with the barely used Pentax K-R dslr that also arrived this morning. The K-R is not a replacement for my K10D or K110D, more an exploration of the world of the CMOS sensor and less noisy high iso performance and some other features. These were all taken at iso 1600 and between f4 an 4.5, handheld in rather low available light: only the Christmas lights or only a single candle.
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Forum: Lens Clubs
12-24-2018, 06:50 AM
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Nice mix of very different subjects, PB.
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Forum: Lens Clubs
11-15-2018, 12:08 PM
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Or we Sigma owners could show how amazingly generous and forgiving we are...............and just not make a big deal out of the mis-post.
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Forum: Lens Clubs
09-08-2018, 07:44 AM
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The poison sumac, I believe, is of a different genus and mainly found in acidic landscapes. I don't think their berries get red either.
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Forum: Lens Clubs
09-01-2018, 06:07 PM
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Did you ever make Sumach-ade? Native peoples would crush the berries, mix in water, and, if they had maple sugar they could sweeten the pink lemonade like drink that resulted. It is a bit of a misnomer to call them berries, in my experience anyway. There is but a thin coating of reddish skin and pulp over the large seeds, but it is tart and somewhat flavorful. I've only made one small batch of the drink, and that was years ago. I have on several other occasions, sucked on one of those sumach seeds though while on a hike.
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Forum: Lens Clubs
08-29-2018, 11:43 AM
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Sigma 100-300mm 4.5-6.7 DL
Pentax PZ-10
Fuji Superia Xtra 400
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Forum: Lens Clubs
07-06-2018, 05:58 PM
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Queen Anne's lace and black-eyed Susans.
Illinois tick trefoil leaves.
Chicken house window.
All three images --
Sigma f4.5-6.7 100-300mm DL af zoom, at f9.5
K10D, at iso800
OOC jpeg, settings flat
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Forum: Lens Clubs
01-26-2018, 09:16 AM
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I always think bad weather makes historic places look more historic, anyway. Arriving right after a storm, that has driven other tourists indoors, can be a great time to look at the historical features...and take pictures.
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Forum: Lens Clubs
11-30-2017, 11:30 AM
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I'm going to be putting my 1979 K-mount manual focus Sigma f3.5 21-35mm back on my K10D very soon.... Posts to follow.
Meanwhile, a question for those with more Sigma experience than I --
If you see a Sigma rear lens cap marked only with the Sigma symbol and below it the capital letters "PE", what mount would you suspect it is?
* PEntax?
* PEtri?
* Something else?
The cap for my 21-35mm says, after the Sigma symbol, "FOR PENTAX-K." and was obviously created in a more verbose time at Sigma than a cap indicating the mount with a mere two initials.
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Forum: Lens Clubs
09-05-2017, 06:43 AM
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I especially like the 3rd shot!
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Forum: Lens Clubs
08-11-2017, 06:26 AM
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Forum: Lens Clubs
05-28-2017, 08:03 AM
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I believe the hunter in your picture specializes in hunting "wabbits," not deer.
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Forum: Lens Clubs
05-27-2017, 08:37 AM
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I love milkweed, but the toxic principals in milkweeds are similar to those in dogbane. My donkey ignores milkweed, but I don't want it in places where my goats might graze, in case they aren't that smart. Most of my place is wild, so that only applies to the small improved and fenced pasture, or nearby areas where escaped goats might go.
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Forum: Lens Clubs
05-27-2017, 06:11 AM
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It's in a cornfield north of my property where no livestock are kept. If it were in my pasture, I would remove it, as I do with milkweed and dogbane. It takes very little dogbane to kill a goat.
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Forum: Lens Clubs
05-15-2017, 09:16 AM
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Ragwort in flower:
Sigma-made Spiratone Mirror-Ultratel F/8 500mm + K10D
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Forum: Lens Clubs
03-17-2017, 06:51 PM
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Not long ago, I got a copy of the original 1979 Sigma f3.5-4 21-35mm. For my first tests, moments after it arrived in the mail, I employed my K10D. It was a cloudy day and the K10D's cropped sensor steals its ultrawideangledness, but the results, all shot with the lens wide open, were promising:
(these two are cross-posted in another thread)
Then, I next put it on my Sears (Ricoh) KSX loaded with a roll of Kodak Ultramax 400, restoring the ultra wide angle possibilities;
(At least two of these three are cross-posted in other threads.)
The lens really has no "macro"/close-focusing ability, beyond that it can focus on subjects rather near. The only way to increase magnification is to turn to the 35mm focal length . Since it is hard to get anything unrecognizably out-of-focus even with the lens wide open (first example below, from the K10D tests), true bokeh isn't possible, but near and far can certainly be separated:
The second of this group is taken at f8 at the closest focusing distance for the post on the side of the barn. The third example of the group, taken at f5.6, was taken from as low as I wanted to bend over the bed of daffodils, not a great flower macro shot, but they were the very first flowers I had seen by that point in this unseasonably warm late winter.
(Only the first of this set of three has been cross-posted.)
I'm very pleased with the lens so far. I will probably shoot a roll of slower black-and-white film with the lens next. Converting some of the Kodak Ultramax 400 scans to BW gives some prediction of what might be possible:
(Cross-posted)
We have one review of this lens here at PF: Sigma 21-35mm F/3.5 - 4 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
From what I have read, the second version of this lens, the f3.5-4.2 released only a few years later, is much more common, and not many years after that was an AF version. Do other participants in this thread have THIS original version I have? Do post a sample picture if you want to tell about your copy of this version in reply to this post.
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