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Forum: Lens Clubs 08-15-2021, 06:15 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
I believe I read in the Pentax discussion about the newer 10-17 mm FE lens, that one can avoid the need to place the horizon dead center to get a straight horizon, by using the sensor shift (not something I tried). It was in the discussion by one of the Pentax supported photographers.
Forum: Pentax Camera and Field Accessories 07-05-2021, 04:04 PM  
Rubber/Silicone Bands for Zoom/Focus creep
Posted By dms
Replies: 13
Views: 576
you can ask at a bike store if they have any inner tubes they are discarding, then cut a rubber band from it. Maybe a wider tire size. Google
"ranger bands" to find out more.
Forum: Troubleshooting and Beginner Help 07-02-2021, 03:04 PM  
Cheap camera/expensive lens??
Posted By dms
Replies: 31
Views: 2,056
Cannot think of a reason for a filter, and it may increase flare. Basically for digital useful filters can be polarizing, neutral density and graduated neutral density, none of which apply to your situation. (And clear or UV if want to protect lens from salt spray, for example; but for physically protecting lens front most of us would prefer a hood, which will also help with flare.)
Forum: Troubleshooting and Beginner Help 06-29-2021, 11:45 AM  
Cheap camera/expensive lens??
Posted By dms
Replies: 31
Views: 2,056
I also think this approach for the beginning. At least you will learn what lens focal length range you need, and whether you need a fast lens (large aperture and AF), or smaller aperture with wider FL, and mostly zone focussing. In the latter case differences between K-x and more modern camera will not be significant. (I used K-x, K-5, and Nikon D-700, for theatre photography and in this scenario see no difference between them.)

On the other hand if you need AF a more recent camera will presumably be much better (although I only use the Nikon D700 for AF, so cannot comment on recent Pentaxes).
Forum: Pentax SLR Lens Discussion 06-29-2021, 11:34 AM  
SMC Coating remedy...
Posted By dms
Replies: 19
Views: 1,172
A filter gives another air-glass surface for refections, e.g., from front of lens to filter and then back again, but unfocused. Doubtful there is any other difference, although one could speculate degradation over time in scratched areas, but even if there is the filter it will not change the local air conditions to something more favorable.

I suppose where (for example) salt water drops are possible it could, except I doubt there is a real difference between glass and the thin coating on the glass. I suppose with HF acid, maybe, but seriously the greater flare with the filter is the main thing that the filter adds.
Forum: General Photography 06-17-2021, 08:22 PM  
Can too much technology stifle creativity?
Posted By dms
Replies: 141
Views: 5,388
It depends.
-- If having to do w/o makes you do things you would not have done otherwise, and because of this made better images, then more bells and whistles may be an impediment.
-- Barring this, having the technology is often neutral/unrelated to the image, and can make it easier, and may make something impossible possible.

Maybe as an artist the first point is more important, and for documentary type work the second one. Your point about mastering some technology and a feeling of accomplishment is important, but I would think this needs to be seen as a given, or else the technology is not ruled by us, but rather it rules us.
Forum: General Talk 06-17-2021, 07:43 PM  
Trail Hiking / Walking Shoes?
Posted By dms
Replies: 35
Views: 1,311
Perhaps a little more about Gortex versus not, and excluding winter (e.g., in the Northeast), which is more specialized.

In spring, when liquid water is likely (melted snow, etc.), it depends. There are two extremes:
— if you are likely to step in water, but below the tops of the boot, Gortex works very well
-- if you are constantly stepping in water over the tops of them, then a non-leather open mesh shoe is best as it lets the water as liquid and vapor leave. Gortex then reduces the rate water vapor can leave (it is breathable, but the point is how much) and it keeps the liquid water in.
— Many activities in hiking are between these two extremes and it is personnel experience/prejudices. This is especially true of fall when (often) almost any shoe/boot will be fine.

Going into summer/warm weather, leather boots (with or w/o Gortex) can hike very warm, and thus can lead to more sweating and thus too much water/not evaporating/overwhelming the Gortex ability. It comes down to how warm and how much you can manage your level of physical activity.

For myself, in most 3 season activity, I opt for a low (climbing) approach shoe constructed of synthetic mesh. But I think many people would prefer a higher boot made with Gortex. It comes down to trying one or the other and seeing if it works for you. But my point is not to assume “being breathable” is the entire answer. Gortex has limitations/potential issues because it reduces the rate water vapor can leave and holds the liquid water in.
Forum: Troubleshooting and Beginner Help 06-11-2021, 01:51 PM  
Tamron 500mm f/8 SP Mirror (55B) problem
Posted By dms
Replies: 12
Views: 650
There is a club specific to adaptall lenses [Adaptall Mount Club (Tamron)], Suggest you post there.
Forum: Travel, Events, and Groups 06-10-2021, 08:25 PM  
Western US trip advice: August 2021
Posted By dms
Replies: 35
Views: 1,692
National Bridges National Monument (Park)

I visited it in the winter and it was empty, and I suspect it is usually less crowded. Nice natural bridges and lovely small cliff dwelling.
Forum: Lens Clubs 06-04-2021, 03:42 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
This is the result of 5 minutes work, added to the top some margin (Canvas) to not lose as much of top of trees, fisheye hemi as before, and then minor fix with warp function to fix the bending at extreme sides. This is a tough one (for me) to do well. I don't work with (almost) circular images--maybe with more tries of ways to fine tune it, it would be better.

If you had some more margin at the top of image (e.g., if it was a true circular image, or you left more margin above top of central dominant tree) I believe it would come out much better w/ fisheye hemi.

From what I have seen fisheye hemi is by far the best software for a natural look w/o loosing much of the image.For a rectangular image to start with you almost lose none of the image. Of course there is a noticeable loss of detail in the top of this image, as you are stretching it outward. Any rectilinear mapping (this extreme, namely from essentially a circle) will have this result.

The last one you had w/ Hugin (oval), I think worked the best for this particular image.
Forum: Lens Clubs 06-04-2021, 03:15 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
This is the result of fisheye hemi (hemi1 option for circular image). Except for cropping to the edge of the actual image, before applying the software, I did not try any other steps. Often increasing the canvas size will make it essentially perfect, but not when the image is too close to a square and a stronger effect is needed, as in this case. The newer version of the FisheyeHemi software allows more control I believe. What I did essentially took no time at all. Crop and click on hemi option in photoshop, and then choose circular image.
Forum: Photographic Industry and Professionals 06-02-2021, 05:29 PM  
Thoughts: the irony of camera industry
Posted By dms
Replies: 114
Views: 6,000
Unfortunately I am not supporting Pentax (or Nikon) with my not buying, and thus I hope many consumers do see a real improvement. Thus it will be possible to buy when and if there is a reason for me to buy new.

For myself, good enough is good enough. Thus I make a point of not comparing older to newer. When I decided I wanted full frame I purchased the least expensive but still viable [and usable with my (for) Nikon lenses], the Nikon D700. For my theatre photography (which is non-existant now) the K-5 (MF) and D700 (now usually AF) are good enough.

Of course if I regularly compared to newer equipment I could decide what I have is not good enough, but I actually think not. I am not in competion with anyone else, where a small improvement may actually have a large impact. (I did change from Photoshop CS2 to CS6, because the changes in camera raw were significant!)**

Actually I have gone back to film for my non-theater photography. Thus I probably am not the best example of the buyers today.

But (for most of today’s buyer) I think good enough is still good enough, and buying new equipment is hoping results will be much better, when improved technique (in taking and post processing) is where real improvements may be had.

_____
** Carbon fiber tripods, are an area where improvements over aluminum are huge, but (now) they are not that new, and the difference in older vs newer, and top tier vs mid-lower tier are again probably in the realm of "good enough is good enough." If (for example) my profession was wildlife photography, my views would be very different, but I and most buyers are not.
Forum: Post Your Photos! 06-01-2021, 10:28 PM  
Night Kemptville by night, moon stole the show
Posted By dms
Replies: 6
Views: 334
In book 2 ("The Negative") of the series on photography, Ansel Adams, in speaking of the image Moonrise.Hernandez, New Mexico, says: "It was of utmost importance to preserve texture in the moon itself." Sounds like what you are saying/doing now.
Forum: Pentax Camera and Field Accessories 05-31-2021, 06:30 PM  
Holster type Camera Case
Posted By dms
Replies: 19
Views: 1,055
I have a Lowepro TLZ 50 AW that I am using w/ an older Sundogs' chest harness and water proof bag. It (the Lowepro) seems well constructed, and large. I used it once so far, to carry Holga-120N and Horizont panoramic cameras, Quantum light meter, small 5x binoculars, filters and film. It has a belt loop but I think it may be too large for this kind of carry.
Forum: Post Your Photos! 05-29-2021, 01:47 PM  
Night Kemptville by night, moon stole the show
Posted By dms
Replies: 6
Views: 334
Really exceptional: both the subject and the processing.
Forum: General Talk 05-28-2021, 08:15 PM  
Trail Hiking / Walking Shoes?
Posted By dms
Replies: 35
Views: 1,311
I agree about fit--it is most important. Ditto about lighter shoes, although my barefoot running shoes make me feel every pebble so likely not for rocky terrain, but otherwise yes. Three other points:
1) a non breathing** (Gortex) shoe will keep your feet wet when you sweat/step in water, and more over they are quite warm.
2) For very rocky terrain I like (climbing) approach shoes (La Sportiva, Scarpa, etc.) but I prefer them with mesh for most situations, as they are cooler and dry out as I hike.
3) wool socks are for me the other important item, and not thick so they don't bunch up.

I wear my La Sportiva approach shoes more in the city, and have had my 3 pairs Vibram soles replaced. So they can be reshod, although you may need to do some glueing/marine epoxy on the uppers. But if they are only for hiking, I think they will last almost forever. Hiking on pavement, or wading streams w/ sharp rocks are the scenarios that wear them out more quickly.

** My bad, yes it does pass the vapor component, I meant it does not pass the liquid component.
Forum: General Talk 05-21-2021, 08:40 PM  
Tick diseases on the rise
Posted By dms
Replies: 16
Views: 2,871
I would suggest you use Permethrin (as the OP said)--it is sprayed onto clothing (especially socks, pants cuff, etc.). I gather it is effective for ticks and mosquitos. Apparently it lasts thru many washings. REI for one has it. (I use it although that does not prove anything.)
Forum: General Talk 05-19-2021, 09:11 PM  
Can a Coleman Lantern burn on one mantel?
Posted By dms
Replies: 32
Views: 1,552
No white gas is not kerosene. Much higher vapor pressure. Kerosene is basically a light oil. I believe the white gas does not have additives that are in auto gas. Also I believe the white gas is considerably lower in octane. Lanterns that burn with a wick run on kerosine. It may be possible to vaporize/pressurize kerosene to run in a lantern w/ mantles, as there are multi-fuel stoves that use kerosine and white gas (I don't know/recall). Anyway I would buy white gas/not use auto gasoline.
Forum: Pentax SLR Lens Discussion 05-11-2021, 09:18 AM  
Pentax 28mm shift lenses grossly overpriced.
Posted By dms
Replies: 21
Views: 1,066
It can make sense to buy a camera that works with the lens you want. The NIkon 28mm and 35mm PC lenses are inexpensive and then, for example, you can get a Nikon D700 (for $400) [still a superb dslr] or a Nikon film camera like the FM or FE [also great] for about $100. I have all of these in addition to my Pentax cameras. BTW the Nikkor 35mm f/2.8 PC lens is fast and small--just a bit narrow FOV depending what you want it for.
Forum: Pentax K-1 & K-1 II 04-28-2021, 09:50 PM  
AA battery life
Posted By dms
Replies: 28
Views: 1,035
Although I never actually took a count, this is also my gut feeling about AA lithium (Energizer) vs rechargeable eneloop AAs. An order of magnitude difference.
Forum: Lens Clubs 04-26-2021, 10:44 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
If you go back and see my original post (above) w/ fish-eye hemi, I added the correction w/o the additional perspective adjustment in photoshop (for your camera not being level). The point is you don't lose any (or none I noticed) of the original image with this software.
Forum: Lens Clubs 04-24-2021, 11:35 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
I use it as a plug in for photoshop. For me (mostly) I use FE lenses for the very wide FOV and because after using fisheye hemi they have less distortion than a very wide rectilinear lens, particularly for vertical lines and people near the extreme edges, and you lose essentially none of the image, thus perfect for my theatre photography and landscapes. I actually have more FE lenses than any other category (5 of them).
Forum: Lens Clubs 04-24-2021, 05:36 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,853
Views: 702,533
If you have not seen what fisheye hemi software can do, I took the liberty of applying it to your image (and a minor perspective control).

I thought it would be interesting to show the Fish-eye hemi correction w/o the PC adjustments (the Perspective Control adjustment was done only because the camera was not level). I think you can see the fisheye hemi loses none of the original image, or any none that I noticed.
Forum: Pentax DSLR Discussion 04-22-2021, 04:40 PM  
Dedicated Camera Bodies (& The Lenses They Hang With)
Posted By dms
Replies: 20
Views: 972
for my Theater Photography (when it comes back!)
2 Nikon D-700's, usually with 35mm and 50mm AF lenses (but choices of MF 16 mm FE to 200 mm)
2 Pentax K-5, usually with 16mm f/2.8 FE, 20-40mm Ltd, or (K) 135mm f/2.5

Everything else now is usually film--lots of choices--ranging from 35mm (FF), 35mm panorama, and 120 (6x6 mostly).
Forum: Troubleshooting and Beginner Help 04-16-2021, 05:28 PM  
Vintage filters
Posted By dms
Replies: 17
Views: 820
Often the circular filter is then put in a square frame (as you have). Also circular filters may be inserted in the rear of the holder, such as the standard PL (not for example the yellow-blue PL)-, but these are in a much thicker sort of toothed circular holder. And, although none of the ones you show are it, there are Cokin A size--the smallest, and two I believe larger than the P size that you have.

Actually the circular one with the smaller OD may be a Cokin A size, to be inserted into the Cokin A size frame, and then inserted into the A size holder. I don't recognize it, but I only use/know the graduated NDs, PLs, and color conversion filters.
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