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Forum: Lens Sample Photo Archive 13 Hours Ago  
SMC A 20mm f2.8
Posted By Take-5-JB
Replies: 17
Views: 418
Pepperberry Farm,

Roger that. For the most part I have vetted well with my purchases. I have a m42 and K version of the 55 f1.8 that are very nice. And M100 f2.8 and A35-105 f3.5 that are nice. I have Sigma, Soligar, Mitakon, and Vivitar in m42 and K mounts that are pretty good.

Thanks,

JB
Forum: Lens Sample Photo Archive 1 Day Ago  
SMC A 20mm f2.8
Posted By Take-5-JB
Replies: 17
Views: 418
Pepperberry Farm,

Now you have done it. I have got to get a Pentax A 20 f2.8!! I have been mulling over 20 and 24mm and wide zooms. The widest I have is A 28 f2.8 for my K1 or 18-55 for the APS-C bodies I have (~27mm relative to FF). I don't want too wide so I think I just found my new LBA focus.

Great images!!

JB
Forum: Lens Clubs 1 Day Ago  
300mm plus Lens Club: discuss your long lenses
Posted By Take-5-JB
Replies: 32,794
Views: 3,134,485
Sivakumar,

Beautiful shot of the falcons. They have their eyes on something!

JB

---------- Post added 01-28-2020 at 01:33 PM ----------


Ducatigaz,

You have a fine wildlife lens in that Sigma 800 f5.6. The resolution of the feather structure is great. The blurring of the background "pops" the subject. Nice birding lens. Great image and lens.

JB
Forum: Lens Clubs 1 Day Ago  
300mm plus Lens Club: discuss your long lenses
Posted By Take-5-JB
Replies: 32,794
Views: 3,134,485
Ducatigaz,

Very Nice!

Was that at f5.6? With that length lens, it is hard to know how close the vegetation (out of focus) is to the bird. Is it a hard focus due to a thin focal plane? Or is it just the compression of the field of view due to long focal length? I bet it looks like a shoulder fired rocket launcher poking out of your car!

JB
Forum: Lens Clubs 3 Days Ago  
300mm plus Lens Club: discuss your long lenses
Posted By Take-5-JB
Replies: 32,794
Views: 3,134,485
Des,

I made my living as an Industrial Chemist, but I am a degreed Biologist, also. I understand the task ahead of Australia. It may take 30-100 years, if at all, to round up nearby breeding pairs and groups in quantities that will help to re-populate the area, but many invertebrates may be rare and indeed now extinct. The battle will also include soil preservation and protection. The first to recover may be the most fire tolerant plants, but establishing anything close to the prior flora may be difficult to impossible. Keep the faith and encourage your friends, neighbors, and leaders to be forward thinking and give it one hell of an effort.

Peace and strength be with you. If you are of faith, look to the peace and grace that passes understanding and draw on the spirit in each to overcome.

JB

---------- Post added 01-25-2020 at 03:45 PM ----------


Wpresto,

Great shot. Feeling of action and impending action. Many shots look like portraits. It is harder to capture "action".

JB

---------- Post added 01-25-2020 at 03:52 PM ----------

Ducatigaz,

Sweet capture of owl in flight! Energy and position of body is eye catching.

JB
Forum: Lens Sample Photo Archive 4 Days Ago  
SMC A 20mm f2.8
Posted By Take-5-JB
Replies: 17
Views: 418
You are welcome. I enjoy your work with "old" glass. I used my A 35-105 f3.5 a lot in 2019 on my K1. I started in 1977 with manual and aperture preferred manual focus, so I love playing around with my M, K, and A lenses.

JB
Forum: Lens Sample Photo Archive 5 Days Ago  
SMC A 20mm f2.8
Posted By Take-5-JB
Replies: 17
Views: 418
If you ever think about getting rid of that lens, sit down, take a deep breath, and pack it up well and send it to me.

Nice "old" lens. Very nice shots.

JB
Forum: Pentax DSLR Discussion 12-24-2019, 05:13 PM  
Pentax k1 2019 still worth it?
Posted By Take-5-JB
Replies: 58
Views: 2,272
I have a K1 and am very happy with it. I use it for Landscape and general shooting. I have a wildlife bag with a K3 and K5 for the "reach". I even have my K200D in my boat/kayak bag. I started in 1977 with 35mm film SLR. I like all 4 of these cameras for different reasons. I would keep the K70 also.

JB
Forum: Photographic Industry and Professionals 12-06-2019, 03:43 PM  
CIPA shipments October 2019 - More mirrorless cameras shipped than DSLRs
Posted By Take-5-JB
Replies: 76
Views: 2,710
Biz-Engineer,

You may have identified a situation of violating the Sherman Anti-trust Laws, if any of it occurred in the USA.

JB
Forum: Pentax News and Rumors 12-06-2019, 03:08 PM  
Sigma stops K-Mount support
Posted By Take-5-JB
Replies: 707
Views: 31,745
Wow! This post is like a synopsis of the photographic world today. Individualism and art count for nothing. Perfection is king, no matter how sterile. Jazz and Rock are pitifully impure music. A pianist with hand span too small to play Rachmaninoff and Liszt is not a real concert maestro. If you are not driving a Lamborghini, you are basically walking.

Now on to Sigma. I have been trying to figure how to justify and afford a brand new Sigma 500mm/f4.5, but might not have much time left.

Oh well, I shall trudge onward.

JB
Forum: Pentax Full Frame 12-04-2019, 10:35 PM  
K and M lenses with the K-1. How well does it work out?
Posted By Take-5-JB
Replies: 29
Views: 1,267
My K-1 bag has a Sigma A 28/2.8, Pentax K55/1.8, Pentax M100/2.8, Pentax A 35-105/3.5, and Tamron 70-200/2.8 Di LD Macro auto lens. The A35-105/3.5 stays on most of the time. I use Circ Polarizing filters. My wildlife K3/K5 bag has a Pentax DA*300/4 and non-pentax manual lenses up to 400mm. For your question, the manual Pentax K55/1.8 and Pentax M100/2.8 are quite good. I started in 1977 with film SLR cameras so I am used to manual and "A" lenses.

JB
Forum: Digital Processing, Software, and Printing 11-29-2019, 02:18 PM  
Photo Editing Software
Posted By Take-5-JB
Replies: 83
Views: 5,808
I use DCU5 to convert to jpeg or tiff. I have Corel Paintshop Pro 9 Ultimate and use the 64bit version on my PC with Win 7 (came with 32 & 64 bit, & Aftershot). I am going to check out RawTherapee. I have a MacBook Pro but I still do the processing on my PC. I don't do as much in depth post processing as I read about on here. I do some sharpening, denoising, minor color, cropping, minor artifact removal (dust spots, gnats, etc), and resizing. The stitching and overlays, etc, are not in my bailiwick at this time.

JB
Forum: Pentax K-1 11-25-2019, 10:02 PM  
Biggest enlargement from K-1 you've been happy with?
Posted By Take-5-JB
Replies: 61
Views: 2,954
RobA_Oz,

The A35-105 is a nifty lens, but can be a little finicky when the light is too direct or bright. Contrast is one thing and a little layering of brightness from center going toward edge. Best when light is angled closer to 90 degrees or higher.

The interpolating expansion algorithm that I have been using is bicubic based and seems to bring forth the image with minimal distortion. My impression is that this may be included in many post processing software packages. I use Corel software. You have to denoise and sharpen carefully. The enlargement algorithm expands the noise, also. If you try to sharpen too freely, you will generate halo effects on the edges of contours and the skyline. I look at enlarged sections to make sure the overall image will be reasonable. I have used it to enlarge K200D 10MP, K-5 16MP, and K-3 24MP images also. But not that large.

JB
Forum: Pentax SLR Lens Discussion 11-25-2019, 03:52 PM  
The Very Best M42 Lenses
Posted By Take-5-JB
Replies: 46
Views: 2,532
I have the SMC 55 f1.8 in m42 and K version. Both are darn nice.

JB
Forum: Pentax K-1 11-25-2019, 03:39 PM  
Biggest enlargement from K-1 you've been happy with?
Posted By Take-5-JB
Replies: 61
Views: 2,954
CAVEAT: I am not an expert, a physicist, or optical engineer. I am a retired industrial chemist.

I have a small photography business, I don't make a lot of sales, I am a juried exhibiting artist in photography and exhibit in a gallery in Charleston, SC. I started photography in 1977 with 35mm film. All that considered, see caveat.

For a commission in 2018 for a landscape of a lake with mountains and clouds during an afternoon storm, I judiciously used denoising, sharpening, and my favorite interpolating enlargement algorithm and made a 300 dpi 72x96 inch image from the 16x24 inch 300 dpi image that is generated from 35mm full frame digital. I that took down to 48x72 inch at 450 dpi. I sent this to my canvas printing partner and they produced the 48x72 inch canvas stretched in gallery mount. My client hung it above the couch in her den that had a 20 foot ceiling. She loved it and had a party shortly after where it was a hit.

Could you inspect it with a loupe? Not to make experts happy, but it had the artistic value she desired with the event she requested. She gladly paid for the work.

The image was made with my K-1 and A35-105mm with a circular polarizer, a tripod, and hand held shutter release. Again, see caveat.

JB
Forum: Pentax K-70 11-22-2019, 11:49 AM  
Digital Utility 5 software that comes with the K70
Posted By Take-5-JB
Replies: 13
Views: 656
I use DCU5 to go from RAW to jpeg or TIFF. I use Corel Paint Shop Pro 9 (17) Ultimate for processing.

JB
Forum: General Photography 10-14-2019, 12:33 PM  
What is 'correct' exposure ?
Posted By Take-5-JB
Replies: 23
Views: 917
When I slowly came into digital (15-20 years ago) transitioning from film with rated ASA and a little flexibility, I noticed the breadth of the ISO range even then. As Auto ISO and functionally higher ISO ranges evolved, the "Auto" setting pushed to yield a mid-afternoon type image even if the time was dusk.This is why I rarely use "Auto" and if I do it is usually Auto ISO with a defined range. I know what I am trying to achieve. I usually underexpose to minimize blowouts, or crop to areas with usable exposure.

I use manual, aperture pref, shutter speed pref, or a combo with either a set ISO (100,200,400 etc) or a range of Auto ISO (100-800, 100-1200, etc) with 100-6500 usually the highest to adapt to quickly changing situations. For wildlife action shots where the value is in the shot not the perfection of the shot, later use of Noise Reduction and Sharpening can help recover some of what was dulled by high ISO, when shutter speed and DoF was a necessity.

There is a "correct" exposure for a studio with supplied lighting and colors, but outdoors requires planning for the light and effect desired. There are camps: Perfection at all costs; use all the Technical you can; modify the image to almost not being a photograph; and do the best you can at the time to get an image capturing some occurrence that may never be seen again. I have described myself as a commando photographer and I fit more into the last group. I use post processing to clean up, but not change the essence of the image.

JB
Forum: Pentax DSLR Discussion 10-10-2019, 12:30 PM  
Who here never, ever used the video mode?
Posted By Take-5-JB
Replies: 284
Views: 13,771
Nope. No videos with Pentax equipment. Bought for still photography.

JB
Forum: General Photography 09-26-2019, 11:51 AM  
Sharpening in Photoshop
Posted By Take-5-JB
Replies: 11
Views: 894
Just a thought. In High Pass Sharpening, look to see if you have a subset point called Soft Light. I use Corel Paint Shop Pro 9 and the SL (soft light) setting has less of an impact on color and hue. Also, I use either 5 or 10% settings sequentially to get sharpening, but not any halo effect. It allows an incremental back up to eliminate any onset of the halo effect.

JB
Forum: Pentax DSLR Discussion 08-10-2019, 01:31 PM  
Copying to computer - pop the card or USB?
Posted By Take-5-JB
Replies: 54
Views: 2,582
I use the card. I carry two portable hard drives in my computer bag and I have two more at home. I copy to the two hard drives, confirm storage on both, replace the card in the camera and clear. Then I remove the camera battery and place on charge. I do this for each camera unless I can't charge, then I replace the battery with a fresh one saving the partially discharged batteries for backup. When I am back home I copy one of the two drives to a storage drive that only has out of camera Raw and jpg. I copy the other drive to another home drive that has any work I may have done in the field.

Redundant? Yes, but I have "working" hard drives and camera output only drives. I may work Raw files in a couple ways, but I alway have an untouched Raw file not saved through a PP program. Works for me.

JB
Forum: General Photography 08-09-2019, 03:18 PM  
Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem
Posted By Take-5-JB
Replies: 26
Views: 2,070
Paul the Sunman and Rondec,

That maybe the difference in reading Popular Mechanics versus a reviewed journal article written by the authoring researcher. In industrial work we had to include an Executive Summary cover page with general purpose and conclusions summary, but no methods, data, or statistical data evaluation.

I appreciate the comments by the folks on this website that have knowledge of Optical Physics and Engineering. Keep informing the rest of us.

JB
Forum: Digital Processing, Software, and Printing 08-08-2019, 12:18 PM  
Waiting for the light or post-processing?
Posted By Take-5-JB
Replies: 25
Views: 1,694
I choose waiting for light and less PP. Just my personal preference.

JB
Forum: General Photography 08-08-2019, 11:53 AM  
Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem
Posted By Take-5-JB
Replies: 26
Views: 2,070
Photoptimist and others citing reality,

I am a Chemist and my daughter is a Physicist. When we are joking about research, one of the standard pun lines is..."it was modeled as a spherical object in a vacuum at one wavelength and temperature". Reality versus hope. Hope is not a method. Simplified models do not translate well into over-arching multivariate problems. More work is needed and more Nutella!

JB
Forum: General Photography 08-02-2019, 10:39 AM  
Environments favourable to Fungus
Posted By Take-5-JB
Replies: 7
Views: 626
ZombieArmy,

Nothing is absolute. There is an increased propensity for an event to occur as the convergence of supportive conditions occurs. I am glad you and those you know have been able to avoid problems. The more expensive the equipment, the better it is to employ insurance prophylactically, i.e., a purchased policy and/or actions that provide a modicum of protection. A food substrate can promote the problem. Internals of lenses may have resins, or glues, which are organic based, or if the lens was improperly handled during service (jeweler gloves or high quality wiping cloths not used) there may be skin oils present. In addition, darkness, or lack of direct sunlight, can allow/support microbe growth. Generally, UV light negatively impacts microbes. Actively used equipment will see more UV light than stored equipment. If one is working in an Equatorial area during rainy season, it would be wise to have a moisture control regimen to help thwart fungal invasion of the equipment during short term, or longer term, storage of the equipment after the expedition.

Continued success and enjoyment of your photography!

JB
Forum: General Photography 07-29-2019, 02:50 PM  
Environments favourable to Fungus
Posted By Take-5-JB
Replies: 7
Views: 626
One has to think about this as the survival modus operandi for fungi and spore forming bacteria. If the environment is warm and humid, they proliferate. If it is hot and low humidity, or cold and dry, it is not in the optimal zone and the emergent organisms die, but the spores they produced while living are existing in near perpetuity. Except for some extreme locations where the environment can kill or denature the spores, you will find fungi and spore forming bacteria. Desiccation is the general control program. If your equipment is in an air conditioned or otherwise lower humidity situation and you take them out in the world to use, it would be wise to keep some desiccating packs in your backpack or case. Putting the equipment in the presence of desiccants or drying rods and the like after being out in higher humidity is good tactic to prevent the spores from activating. The spores are almost always present. Here on the SE coastal lowcountry, doctors will tell you we live in a breeder reactor for sinus, ear, nose, throat and lung related fungal and bacterial infections (i.e., sinusitis). Photoptimist has a good tool there, as the higher the dew point temp, the higher the humidity, the more likely you will activate spores.

An aside to elucidate the point...A friend was a Green Beret with three tours in Vietnam fighting in the mountains near the Laos border. He said it was hot and humid in the day and just below the dew point at night so you sweated all day and dew dropped on you all night, or it rained. They were never dry and cool. They constantly suffered from jock itch, athletes foot, ear and throat infections, and other ailments. Temp & humidity was perfect for fungal spore activation and the organism ran wild.

JB
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