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Forum: Pentax SLR Lens Discussion 5 Days Ago  
Lens suggestions for light k3-ii hiking setup....
Posted By dms
Replies: 33
Views: 1,028
You don't mention what FL/FL range you seem to like, the Pentax pancake lens on film (I think you said you liked) would be the 40 mm FL, which is about 26 or 27 mm on K-3 (for same field of view). So if you want a zoom (I don't like zoom for outdoors hiking, but that is likely a minority view) I would suggest the 28-70mm FA f/4 lens. (I have mentioned this lens often, and I have two of them, which I use a lot at f/5.6.) It is incredibly low in price (~$ 40 used), and optically very good, and light weight, and AF seems to work fine. Build quality is not great, but it works OK. It has aperture ring and a distance scale--the latter is very important IMO.
Forum: Pentax SLR Lens Discussion 6 Days Ago  
Lens suggestions for light k3-ii hiking setup....
Posted By dms
Replies: 33
Views: 1,028
I was not going to bring it up--but yes the K-3 is very large and heavy for backpacking. In my case, I now carry a Q and pick two lenses from the 01, 02, 03, 04. Usually the 03 (fisheye) and 04. Except if I anticipate very wet conditions (like the camera sitting in water), in which case I take the (rather heavy) Nikonos III + 35mm lens.

I also suppose if resolution was more important (and I wanted digital) I would consider taking the K-x and Lithium AA batteries. (Except for sitting in the canoe in water) water resistant camera/lens are not to meaningful IMO.
Forum: Pentax SLR Lens Discussion 6 Days Ago  
Lens suggestions for light k3-ii hiking setup....
Posted By dms
Replies: 33
Views: 1,028
I do backpacking and canoeing, and my choice is a camera with moderate wide angle, at the ready (neck strap plus strap around the back). I think a 30~35 mm FF equivalent and not very fast lens, is small/likely robust/and a good choice for hiking outdoors. I would possibly supplement this with a second lens--such small macro, or fisheye, or whatever more specialized area interests you--but I think the moderate wide angle would do almost everything.

For a specific lens--I likely would take M 20 mm f/4, or the equivalent in a more modern AF--except I don't have/use them.
Forum: Troubleshooting and Beginner Help 02-12-2018, 12:02 AM  
Should I keep this?
Posted By dms
Replies: 13
Views: 773
I have a lens that does it, and it seems to be the same shape at all f-stops, and instantly stops down, which suggests to me it is not grease--and that may be yours also. I would think the effect may be noticeable shooting small (or distant) lights at night, where they are out of focus (as pjv noted above), and likely not in usual situations.
Forum: Pentax SLR Lens Discussion 02-04-2018, 07:06 PM  
Adding diaphragm to a mirror lens?
Posted By dms
Replies: 8
Views: 456
I have never tried it, but if you cut out a circle on a larger piece of cardboard (diameter equal to front of lens), and the opening is tangent to the inner and outer edges of the glass area in the lens front, it will act as a smaller aperture and (thus) should give greater depth of field.

Adding a short tube should make it focus closer, and likely lose infinity focus, and an aperture there is likely much to far back to work.
Forum: Troubleshooting and Beginner Help 02-02-2018, 10:37 PM  
Shooting in the Catskills Tomorrow
Posted By dms
Replies: 7
Views: 313
If the K1000 meter works you can meter the blue sky far from the sun, and likely decrease exposure by 1/2 to 1 stop, or meter the snow and increase exposure by 1 stop if old snow, and 2 stops if fresh snow.
Forum: Photographic Technique 02-02-2018, 09:57 PM  
Action Using various white balances and Kelvin Temperatures in camera
Posted By dms
Replies: 8
Views: 488
If you want to correct for the color temperature of the light--you dial in that temperature** and it will make the colors look correct (whites will be white), but correct is usually wrong because you want the candle light to look like candle light. Shoot in raw and then you can do any adjustment you want later.

Color balancing filters are often rated by MIRED scale, more common/more useful than Kodak's system of 85B, etc. E.g., - 250 Mired filter (blue) shifts the light color making it cooler*** by 1 million/250 K, or about 2500 K shift, making 2800K + 2500 K = 5300K about normal daylight. + 250 (amber) would lower the temperature by the same 2500K.

I don't have a reference--likely any old school book on exposure for color photography will discuss it. Also you are mixing up color adjustments and color temperature correction--the latter is what I meant by color balancing, although that may be the wrong term (color temperature adjustment is really what I meant).
____
** BTW 2800 K seems much too high for candle light--so recheck it. 2800K is about a standard 100 watt incandescent light bulb,
*** Perhaps I should explain, cooler usually means more blue, or higher temperature.
Forum: Troubleshooting and Beginner Help 02-02-2018, 09:18 PM  
Shooting in the Catskills Tomorrow
Posted By dms
Replies: 7
Views: 313
It has been a long time since I climbed Slide but I believe there are some excellent vistas from rocky outcroppings, and at this time you likely can get great wide angle or panoramas. Certainly the peak will be grand. Presume you will be well equipped (ice axe and crampons), and because of the difficulty(s) I would go very light on photography equipment and have the camera accessible (under windproof) but strapped around chest so it does not bounce. One camera and a 28~35 mm would be my choice, and possibly a fisheye (if you like them) as well. I would think the temperature will be 0F at the peak, cold enough that you need to advance film slowly, and plan on not changing film.

If sunny and ice/snow you should use the sunny f/22 rule (meaning 1/400sec w/ iso 400, at f/22, or 1/800 sec at f/16). Light meters in cameras are very unreliable--the film directions (cheat sheet) are better--or if inexperienced an incident light meter (for the future) is best. Used they are inexpensive and generally reliable. I like the ones that don't need a battery--e.g., Sekonic L398.
Forum: General Photography 01-28-2018, 02:32 AM  
Kickstart Pinhole Pro: Professional Pinhole Lens Includes Pentax K
Posted By dms
Replies: 20
Views: 1,374
My Finney pinhole lens has adjustable pinhole sizes and weighs about 2 oz (on my cheap food scale) and is small and well built. The pinhole pro weighs about 7 oz and is much larger. To handle them the difference is quite obvious.
Forum: General Photography 01-27-2018, 10:52 PM  
Pentax-F&fa LENSES
Posted By dms
Replies: 12
Views: 687
If the light level is not very low (for my theatre photography) my FA 28~70 mm f/4 is my preferred zoom in that FL range. It is very cheap in cost/apparent construction but the optical quality is quite fine at f/5.6 where I use it. Cannot address post K-5, but on the K-5 it is fine. I actually have two of them as my first one stopped zooming below 31 mm. Cannot believe this fine lens can be gotten (as is the case now) at KEH for less than $40.00 in BGN condition.
Forum: General Photography 01-27-2018, 10:39 PM  
Kickstart Pinhole Pro: Professional Pinhole Lens Includes Pentax K
Posted By dms
Replies: 20
Views: 1,374
Exactly, as I indicated earlier. The idea of making a pinhole lens huge/heavy shows no sense of what is appropriate, And then to not be able to mount it on a FF Pentax--when pinhole really works best with as large a sensor/film as possible. It soured me on the product, such that I have not been interested in using it.
Forum: Pentax SLR Lens Discussion 01-24-2018, 09:32 PM  
49mm to 28mm Step Down
Posted By dms
Replies: 20
Views: 689
Generally** the vignetting is worst when focussed at infinity, and at the smallest aperture. So w/ a prime lens shoot a light wall with focus distance set to infinity (or anyway a large distance), and f/22 or the smallest aperture you could use.
____
** zoom lenses could have odd FL changes w/ distance.
Forum: Pentax SLR Lens Discussion 01-24-2018, 10:02 AM  
49mm to 28mm Step Down
Posted By dms
Replies: 20
Views: 689
You can do it with two step down rings--e.g., a 49-37mm and a 37-28mm.
Forum: Product Suggestions and Feedback 01-20-2018, 11:41 PM  
KP-like mirrorless solution?
Posted By dms
Replies: 20
Views: 760
I use a 35mm optical finder ** on a K-x with 20mm f/4 M lens and it is very nice handling, and small. I would try such an arrangement w/ the newer small Pentax. It combines the speed and ability to see what is entering the frame using the optical finder, along w/ the advantages of dslr.
_____
** The 35mm finder magnification allows me to shoot w/ both eyes open--likely not so with a 28mm finder.
Forum: Troubleshooting and Beginner Help 01-18-2018, 11:31 PM  
Using old SMC Pentax-A lenses with Pentax DSLR
Posted By dms
Replies: 31
Views: 1,483
If AF is not important, a used K-5 (likely about $250 from KEH or B&H) would get a lot of bang for the buck; however, no matter which model--if you are using fast glass wide or close to wide open--a replacement screen (likely from focussingscreen ) would be important. I find I cannot adequately focus w/o one.
Forum: Post Your Photos! 01-18-2018, 08:04 PM  
People US Navy Camera Repairman.
Posted By dms
Replies: 12
Views: 362
Believe there is some debate whether it was the Pentax Spotmatic or Alpa 9D (both of which I own/used), or the Topcon (D?). It was 1964 as I recall.
Forum: Pentax SLR Lens Discussion 01-16-2018, 11:37 PM  
Macro lens
Posted By dms
Replies: 23
Views: 1,018
Right. They are essentially same weight. I was writing about D FA's, but was thinking of the FA (and F) version weight wise.
Forum: Pentax SLR Lens Discussion 01-16-2018, 08:36 PM  
Macro lens
Posted By dms
Replies: 23
Views: 1,018
Presumably you know it--but in just in case--the WP version has no aperture ring. The non WP version w/ aperture ring allows use of bellows, extension tubes, etc. This could be important down the road, but apparently the non WP lens is heavier, and of course is not WP.

My apologies Na Horuk already mentioned it--I should have read more carefully.
Forum: Post Your Photos! 01-14-2018, 07:26 PM  
People Making pint glasses
Posted By dms
Replies: 5
Views: 259
Your thumb is cut off at a poor location--suggest you make the entire thumb show.
Forum: Pentax SLR Lens Discussion 01-14-2018, 07:06 PM  
Why are some lenses compact and other similar focal lengths large?
Posted By dms
Replies: 22
Views: 1,011
It is too simple an explanation, and of course the design objectives vary and thus similar FL designs will differ, but consider that you want to make a lens that has outstanding performance wide open--say at f/1.4.

One way would be to design the lens to have a maximum opening of f/1.0 and then limit the lens to f/1.4. Roughly no vignetting then, and some of the optical aberrations reduced to roughly 1/10 of what they would be at f/1.0.

In past decades perhaps one wouldn't expect great performance (or rather a different kind of rendering) full open, but if one is willing to accept a large lens, and spend a lot, and because the resolution of sensors are so high now, and (for some) the pixel peeping syndrome, then maybe an f/1.0 lens limited to f/1.4 makes sense. Again this is too simple an explanation, but I think there is likely some truth in this kind of design logic.
Forum: Pentax K-1 01-13-2018, 11:56 PM  
RAW+ vs. RAW vs. JPEG
Posted By dms
Replies: 30
Views: 1,692
The OP had a technical question for which these kind of value judgements are not appropriate, rude, and for many photographers incorrect.

I would argue most adjustments in pp are to fix an incorrect WB, to adjust an incorrect exposure, or to fix a tilted horizon line/perspective adjustment/whatever.

Many photographers (that use camera raw) given slide film and a selection of color correction filters would be at a loss, and that is similar to using the digital camera for jpg's only--no big safety net!

---------- Post added 01-14-18 at 12:07 AM ----------



And a Polaroid is not a proper film camera? Some excellent photography at the highest level used Polaroid. E.g., look up Marie Cosindas.
Forum: Troubleshooting and Beginner Help 01-08-2018, 03:15 PM  
focusing help for my experiences with the K 3 and K 3 II
Posted By dms
Replies: 6
Views: 448
I have done it using a Pentax screen and later a focussing screen brand (in K20D), and need to install another one now (in K-5), but it can be problematic--especially if you need to change the shim (spacer), and much more so if you need to stack them. I would not minimize the difficulty, and the possibility of getting foreign material, scratches, etc.

If I was assured of a professional to do it--and verify the proper shim(s) are used--I would pay an extra 50% to have her/him do it--but w/o an assurance they are reliable, we are likely stuck with doing it ourselves. Good luck/take your time/ensure the environment is dust free (maybe run the shower), etc.
Forum: Digital Processing, Software, and Printing 01-08-2018, 02:49 PM  
Outsourcing editing.
Posted By dms
Replies: 21
Views: 684
Some of the greatest photographers did not do there own darkroom work, or did not do all of it, so it is really not so different. But the individuals that did the printing may have been almost as famous as the photographer, and worked w/ said photographer on a long term basis.

And on the short term--news breaking events, war photo's, etc.--almost need someone else to do the editing/printing/pp.
Forum: Pentax Q 01-08-2018, 12:34 PM  
Any of the toy lenses worth getting?
Posted By dms
Replies: 20
Views: 1,038
Here is an example of for me a satisfying photo (sunrise on an Adirondack Park lake) with the 04 wide lens. BTW I use an 35mm or 40mm optical finder and attached (w/ tape) a DIY filter ring.
Forum: Pentax Q 01-08-2018, 12:07 PM  
Any of the toy lenses worth getting?
Posted By dms
Replies: 20
Views: 1,038
My most used lenses are (in order of most to least use) are the 04 wide, the 03 FE, and then the 01 normal, and essentially never the 02 zoom (quality is good but it is too large).

About the 04 wide: it lets me have the camera+lens in my pocket basically every day (backpacking/canoeing, commuting/walking, at my college record my lecture work at the board, etc.), it has a reasonable hyperfocal distance so it's use is fast, and I think the quality is quite fine.

And by the way none of them are "holga style."
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