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Forum: Pentax DSLR Discussion
09-04-2020, 01:10 PM
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Thanks both of you for the comments! I forgot to say that the lens used is a Spiratone Flat-field f/3.5 75mm T-mount bellows lens on a focusing helicoid. I have absolutely no idea what sort of coatings (if any) the lens has. It often doesn't seem to matter much with the CCD sensors.
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Forum: Pentax DSLR Discussion
09-04-2020, 09:21 AM
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When worried about shake reduction, I just shoot my K110D at the highest shutter speed I can get under the circumstances. The clothes on this line were not hanging as they appear. They were blowing all over tarnation, but the high shutter speed froze them, along with any shaking I was doing.
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Forum: Pentax DSLR Discussion
08-13-2020, 05:56 PM
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Their song is so haunting.
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Forum: Pentax DSLR Discussion
08-04-2020, 05:42 PM
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Scarlet runner bean flower buds.
Fujinon f2.2 55mm + K110D
(cross-posted)
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Forum: Pentax DSLR Discussion
07-28-2020, 09:30 AM
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Spiratone Flat-field f3.5 75mm bellows lens on 10mm extension tube (approx infinity focus), f11 + Pentax K110D.
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Forum: Pentax DSLR Discussion
07-18-2020, 07:30 PM
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First shots with new-to-me Tamron Adaptall2 SP (O1A) f2.8-3.8 35-80mm. Camera used K110D.
(cross-posted)
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Forum: Pentax DSLR Discussion
07-08-2020, 04:26 AM
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Look again. I think I fixed the problem.
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Forum: Pentax DSLR Discussion
07-07-2020, 01:52 PM
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K110 + Helios 44-2 f2 58mm + cropping
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Forum: Pentax DSLR Discussion
07-05-2020, 12:03 PM
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Bower/Samyang f3.5 8mm
K110D
near closest focusing distance
(cross-posted)
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Forum: Pentax DSLR Discussion
07-05-2020, 07:33 AM
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I see. Your Peleng is NOT a re-labeled clone of the Samyang f3.5 8mm for cropped-sensor digital; it is easy to lose track of all of the different names they get labeled with. The Samyangs are designed to give a rectangular fish-eye image on cropped sensor.
If your Peleng fish-eye produces a full-circle fish-eye image, it seems to me, you have these choices:
1) Shoot it on [A] a full-frame 35mm film body or [B] a full-frame digital body and enjoy those wonderful full-circle fish-eye pictures.
2) Keep shooting it on a cropped-sensor digital body and crop the images enough to get rid of the vignetted corners. Note that you can be creative about that, cropping to a variety of rectangular shapes--including squares--not only the 2:3 side length ratio.
I have an old Samigon "180-Degree Fish-eye" lens attachment, meant to attach to the front of a film camera's normal lens to produce full-circle fish-eye images. I did experiment with mounting it on the front of my Penax-A 35-80mm zoom. Setting that host lens to about 75mm I could get corner-to-corner rectangular images with it on a cropped-sensor Pentax digital camera. I left the host lens aperture wide open and set the aperture on the Samigon according to directions.
Of course, your Peleng attaches directly to the camera, so you can't slip something between it and the camera to un-do the vignetting . . . . ******unless****** you tried a tele-converter somewhere in the 1.4x to 1.7x range ? ? ? If there is a "perfect" tele-converter, it will magnify just enough to remove the vignetting and not so much that it just turning the fish-eye lens into a mere wide-angle. ;)
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Forum: Pentax DSLR Discussion
07-04-2020, 03:35 PM
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No cropping at all on that shot, and don't recalling seeing vignetting with my copy. I did crop a couple of other shots I took today with that lens, but only to improve composition.
I don't know how similar all of the versions of the Samyang f3.5 8mm are. I know, besides the original Samyang, there are also Rokinon and Bower versions. You have a Peleng. Samyang clones also get labeled Phoenix, ProsPec, and others. It's assumed that the optical design of all is the same, but there are at least small appearance differences. I believe that Samyang and Rokinon versions of the 8mm have removable hoods, but mine can't be removed. Are there differences in manufacturing quality standards among the different clone labels that might allow a copy which vignettes get through? I don't know.
*** You aren't using your Peleng 8mm on a full-frame digital Pentax are you? So far as I know all of the versions of the lens are designed to work on Cropped Sensor digital cameras only, and would be guaranteed to give a lot of vignetting on full-farme, but not just in corners.
Are you only getting vignetting with certain apertures? I mainly shoot my copy from wide-open to f8. Maybe it does vignette a bit when stopped down more.
One other thing could affect my copy is that, I purchased mine as a Canon mount version and I converted it to Pentax K. There is a rather large registration distance difference between those two mounts. If my K-mount is still extended back a hair, that could reduce vignetting slightly I suppose.
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Forum: Pentax DSLR Discussion
07-04-2020, 11:45 AM
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K110D
Bower/Samyang f3.5 8mm
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Forum: Pentax DSLR Discussion
03-31-2020, 05:29 AM
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Bower/Samyang f/3.5 8mm + Pentax K110 dslr
(cross-posted in fisheye thread)
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Forum: Pentax DSLR Discussion
03-14-2020, 09:20 AM
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This thread reminds one, or points out if one didn't know, that a later Pentax dslr does not necessarily replace earlier models. Many have their own particular strengths. If you truly appreciate each for what it is, you don't replace one with another, you build a collection, each member of which you keep using.
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Forum: Pentax DSLR Discussion
03-09-2020, 07:32 AM
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Desolate? With all that green grass and unfrozen water and bright blue sky???
That's not desolate.
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Forum: Pentax DSLR Discussion
12-14-2019, 09:31 AM
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I have been missing metal dashboards for a long time. You could put magnetic-based accessories and decorations on them! Some of my Catholic friends would have the entire Holy Family up there! I bet that prevented a lot of road rage!
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Forum: Pentax DSLR Discussion
10-07-2019, 03:00 PM
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I edited the image reinserting it. Does it show for you now?
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Forum: Pentax DSLR Discussion
10-07-2019, 09:56 AM
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Bower (Samyang) f/3.5 8mm Fish-eye + Pentax K110D
(cross-posted)
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Forum: Pentax DSLR Discussion
09-12-2019, 02:12 PM
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No, I mean every time. It is a lot easier to blow dust of the lens than off of a sensor once it gets stuck there.
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Forum: Pentax DSLR Discussion
09-11-2019, 08:17 PM
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Sensor cleaning:
I tried one of those wands with a sticky end, which you cleaned by pressing it on little papers which came with it. The first time I used it, it seemed very easy to use and did a good job cleaning the sensor. The second time, I had trouble using the little papers to get the sticky end of the wand clean between pressing it on areas of the sensor. Also, I might have used a heavier touch. I was afraid I might have scratched or cracked the sensor on my K110D and didn't use it for some time. When I next needed to clean the sensor on my K10D, I ordered a wet clean kit. Think of Dartmoor Dave's cottonbud technique but with flat buds almost sensor wide on long thin plastic handles and with a "special" cleaning solution. You lightly dampen one with the solution, wipe the sensor area lightly but completely, and then use a dry one. Worked great on the K10D. Later, I worked up the courage to try it on my K110D's sensor, and what do you know, it cleaned up fine and shows no sign of having been damaged before as I had worried.
One other thing: when my K10D does the sensor dust-shake-off shimmy on start up, I make sure it is pointed downward so that any dust that might fall off of the sensor goes in the direction toward out of the camera body.
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Forum: Pentax DSLR Discussion
09-05-2019, 10:12 AM
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I have some astigmatism, so the viewfinder's diopter adjustment can't help with that. The magnification correction I need isn't very strong.
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Forum: Pentax DSLR Discussion
09-05-2019, 07:32 AM
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I wear eye glasses, as well. I wear a floppy hat with a brim wide enough to cover the top of the camera. That seems to block most of the excessive light that might sneak in through the viewfinder, or glare in my eyeballs when I am trying to focus or frame pictures.
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Forum: Pentax DSLR Discussion
08-17-2019, 07:02 AM
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The farrier who comes for our donkey is pretty reasonable. Part of the year he comes every 8 weeks, and when hooves grow faster, every 6 weeks. It sounds like the Dartmoor ponies have quite a large area to roam around in, so just the distance they are regularly traveling is going to wear down hooves even on the softer surfaces, but the granite and roads are going to be more effective. Sorry to hear about the collisions with vehicles. We have a gigantic number of wild white-tailed deer here, so they are the most common large animal out on roads, mainly at night. There are far fewer cows on farms in this area than there were fifty of more years ago, but occasionally, perhaps every few years, there will be a collision between a stray cow and a vehicle. I find it frustrating when the news reports never say what happened to the cow.
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Forum: Pentax DSLR Discussion
08-16-2019, 02:56 PM
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Good thing for that exposed granite to be there in sufficient quantity. Not enough abrasive surface here to avoid paying for several farrier visits per year for hoof trims for domestic equines.
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Forum: Pentax DSLR Discussion
08-15-2019, 05:47 AM
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Dave, are there enough hard surfaces in the environment there to wear down the wild ponies hoofs properly, or do humans have to intervene on occasion to give some of them hoof trims?
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