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Forum: Pentax News and Rumors 05-19-2020, 08:03 PM  
Astrophotography lenses that will work on Pentax!
Posted By jbondo
Replies: 7
Views: 1,511
Looks really nice. Tempting. If you get one, be aware: The site states that the FRA400 has a 44m(m) image circle and it includes a M48 adapter. If you're using a aps-c or smaller sensor, it should not be an optical issue to use some sort of adapter that goes as small as a T2. If you're using a full Frame sensor though, there's a good chance that a T2 / m42 adapter will vignette. (Depends on the optical design.) It's quite hard to find M48 to K adapters - I ended up having to make one one, and It made a big difference in vignette when using the K1's on faster instruments like 400mm F4 and 1016mm F4.
Forum: Digital Processing, Software, and Printing 11-28-2019, 09:53 AM  
DxO Sale and a question
Posted By jbondo
Replies: 46
Views: 3,190
Been using it for years, and I am in the process of migrating away from it.
For my needs the strongest features that I valued are:
- Prime de-noising is superior.
- Speed of raw preview when flipping between and comparing shots.

The reasons I am migrating away and towards RawTherapee:
- Cannot make my own correction profiles for my vintage lenses, which I have many. This is a biggest reason.
- The Luminance (flats / vignette) part of the the built in correction profiles were not as good as I expected. With SR off, and at various focusing distances they were close and they did help the image, but there were not precisely on.
- No Linux Support
- It irked me that when I upgraded my K1 to a K1 MkII that I had to buy the new version of the app. Really annoying.
Forum: Repairs and Warranty Service 10-21-2019, 08:58 AM  
DA* 60-250 aperture blades stuck?
Posted By jbondo
Replies: 10
Views: 592
Confirming this is normal on mine as well. Interesting, never noticed before.
Forum: Sold Items 02-14-2019, 05:43 PM  
Wanted - Acquired: SMC K 55 f/2
Posted By jbondo
Replies: 5
Views: 409
PM Sent
Forum: Pentax SLR Lens Discussion 01-10-2019, 05:29 PM  
Poll: Which roadmapped and rumored product is your favorite?
Posted By jbondo
Replies: 86
Views: 3,785
The poll only allows one choice. I'd buy the 85/1.4, 35/1.4, DFA 1.4X, DA 11-18/2.8 ALL equally quickly. I suspect I'd use the 35/1.4 most frequently, followed by the 85.
Forum: Pentax SLR Lens Discussion 12-17-2018, 08:46 PM  
50 vs 77
Posted By jbondo
Replies: 36
Views: 2,506
I use both about equally.

Honestly, it often depends on how much space I will have to work with (shooting distance) or if the large physical size of the DFA 50 will not be appropriate for the situation, or if the weather is threatening.
I would say that with my shooting style, a slightly higher percentage of the shots from the 77 are 'keepers' or 'special' compared to the 50.


FA77:
Glorious world-class Rendering.
Downright small and and light. Integrated slide out hood.
Non-intimidating size for sensitive subjects.
Near wide open the color bokeh can sometimes be distracting, and occasionally with specular reflections that are out of focus.
Glorious world-class Rendering. (yes, repeated)


DFA50:
Huge and heavy for a 50.
Very high resolving power at all stops, out to the corners.
More forgiving in extreme lighting conditions.
Much quieter and surer focusing on my K-1s, better for fast action.
Forum: Pentax K-1 12-16-2018, 05:56 PM  
K-1 upgrade delay
Posted By jbondo
Replies: 129
Views: 8,754
Mine shipped as well 2 day express. Should receive tomorrow.
Forum: Pentax K-1 12-08-2018, 10:47 AM  
K-1 upgrade delay
Posted By jbondo
Replies: 129
Views: 8,754
Both of mine show 'in repair' as well now. Not counting on them getting back to me in time for a trip next week, but still nice to know. Just two days ago I bought another K-01 as a temporary measure to get me by.
Forum: Pentax Medium Format 11-10-2018, 10:27 PM  
645 vs 67 lenses for digital conversion
Posted By jbondo
Replies: 14
Views: 1,411
Another nod to the 400edif f4 (67). Outstanding, though hefty. Can only handhold for about 10 minutes at a time.
Forum: Sold Items 11-03-2018, 11:42 AM  
For Sale - Sold: SMC Pentax-DA 40mm F2.8 XS (Scarce Silver K-5 Limited edition)
Posted By jbondo
Replies: 4
Views: 1,004
bump.
Forum: Sold Items 11-03-2018, 11:42 AM  
For Sale - Sold: SMC Pentax-A 1:4 200mm
Posted By jbondo
Replies: 6
Views: 1,052
It's in great condition. Nice copy.
Forum: Pentax SLR Lens Discussion 11-01-2018, 06:29 AM  
Pentax A* 135mm f1.8
Posted By jbondo
Replies: 85
Views: 8,771
Both my K-1's are off for upgrade service. When they get back I'll do a comparo with my A* and the Samyang.


i will say this: I'm on my third copy of the Samyang. The first two had easily visible uneven sharpness between the left and right sides. My third one has a hint of astigmatism. I'm probably unlucky in this respect but none the less, when you are making financial and time calculations, keep in mind that the Samyangs may have the "hidden" cost thus mentioned. My time is valuable, and it's worth a certain amount of money to me to not have to goof around with multiple copies just to get a solid one.
Forum: Sold Items 10-31-2018, 03:03 PM  
For Sale - Sold: Pentax D-AC120 Switching Adapter & D-DC120 Coupler
Posted By jbondo
Replies: 2
Views: 910
PM Sent
Forum: Pentax K-1 10-28-2018, 05:40 AM  
Use of filters and their need and affects on modern DSLRs
Posted By jbondo
Replies: 57
Views: 3,506
I know that everyone has their own unique approach to thinking about how to shoot and I respect that! That's what makes us all individuals.

My particular way of doing things is to break things down in to steps and consider each step in the order they occur. It's not 'right' or 'wrong' per se. It does bring a great deal of clarity to my thinking about what I am doing and helps me make more effective decisions about adjustments.





There are two scenarios here:
1. C-PL is in front of lens

If we expand upon UncleVanya's previous post:



We get:
Sensor | Color Filter Array (CFA) | Lens | C-PL | Light < --------

in this case It's all about what I want to do with the light before it enters my lens - and therefore my use of a C-Pl has no relationship with which lens I am using. I'm already done with thinking about what I want to do with the polarization aspects of the light before I ever start thinking about what I want to do with the lens. The reason for this is because this is the order in which these things occur. I keep them separate.





2. C-PL is behind one or more surfaces with HD coatings (drop-in filter)

Sensor | Color Filter Array (CFA) | C-PL | Lens | Light < --------

In this case the subcomponent of the light that is scattered internally as it passes through the lens may not have the same polarization state. Therefore the C-PL may have reduced modifying capability.



Even though my working style is essentially the same in both scenarios, my mental model is quite different. I think about what the C-PL is doing when it does it.


Now, with all of the above being said, there is a reverse case to consider:
Q: Is there a case when the lack of HD coatings contradict the use of a C-PL?
A: Yes. In extreme contrast situations (high illuminance) especially if both the lens and the C-PL do not have excellent coatings, you can get a lot of internal reflection between the front element and the filter so you're better off not using the filter.
Forum: General Talk 10-27-2018, 06:20 AM  
You command line, I command line, we all command line for Linux. (^o^ ) <3
Posted By jbondo
Replies: 74
Views: 6,238
At work:
I'm a developer. I run quite a few servers, and lots of boxen: I've used all the Ubuntu and Mint flavors for about 4 years now, also CentOS, RHEL, and quite a herd of Raspberry Pi's


At Home:
2x i7 laptops and one really beefy power desktop. Dedicated Mint Kodi i7 media server with quad tuners. Linux based Qnap NAS.


For the Band:
Pair of Linux Mint 19 Cinnamon laptops used by the light and sound engineers.


Favorite:
Linux Mint 19 Mate is my definite favorite 'windows replacement' and I'm in the process of completely migrating off windows. It has been SO pleasing to see how distros in the last couple of years are reaching "just works" status.
Forum: Digital Processing, Software, and Printing 10-27-2018, 05:50 AM  
Memory Friendly Superresolution Script (In python and hugin)
Posted By jbondo
Replies: 35
Views: 2,577
Thank you very much for sharing and describing your work.
Forum: Pentax K-1 10-23-2018, 06:35 PM  
Use of filters and their need and affects on modern DSLRs
Posted By jbondo
Replies: 57
Views: 3,506
Northrup often has pretty good advice. That particular video was disappointing. Yes, there are numerous times when no filter is superior to using one. The cases he made though didn't illustrate the uses of filters when they are most effective. It's as if the all the cases he made were to specifically sell that you shouldn't usually use one. (imagine that...)


A little knowledge about the physics of polarization can go a long way towards getting the best use of one.

- There is no direct substitute in post processing because our consumer cameras don't record raw polarization data, only illuminance.

- The strongest sky darkening always occurs when your shooting axis is at 90 degrees from the sun. (or whatever the illumination is if it's at night.) Shooting near 0 or 180 from the sun especially is often unproductive.. but not always because sometimes bounced light needs to be modified.

- Unless you're intentionally creating an uneven effect, don't exceed 45 or so degree angle of view as you will be unable uniformly apply to all areas in frame.
- Particulate haze and smoke can respond to polarizers in some circumstances, but it depends on the size of the particulates.

- Glare reduction and sky darkening are not the only uses of a polarizer. Tony fails to mention that a polarizer can also positively accentuate reflections and illumination when desired for creative use. - Including eyes.

- Some materials (pearlescents, fine grained sparkles) can respond superbly to polarizers because the nature of the shimmer is from reflecting light from many angles. You can shape the nature of the glimmer.
- I've used DXO Clearview a quite lot, It can be useful, but lacks the nuance possible with a polarizer. I have sometimes use both in the same image because they accomplish things differently.

- Utterly indispensable when you want to blacken a lit LCD screen near your subject. Has saved me from extensive post editing on several corporate gigs, not to mention easier metering.
- Nothing makes a rainbow pop like a polarizer because the internal reflections within the raindrops are different polarization than the surface reflections (but wide angle of view may be a limiting factor.)
Forum: Sold Items 10-23-2018, 04:34 PM  
For Sale - Sold: SMC Pentax-A 1:4 200mm
Posted By jbondo
Replies: 6
Views: 1,052
Bumpin.
Forum: Sold Items 10-23-2018, 04:32 PM  
For Sale - Sold: SMC Pentax-DA 40mm F2.8 XS (Scarce Silver K-5 Limited edition)
Posted By jbondo
Replies: 4
Views: 1,004
Bump. Price Drop. It's so much more attractive than the black faced version.
Forum: Pentax K-1 10-16-2018, 07:50 PM  
K-1 upgrade delay
Posted By jbondo
Replies: 129
Views: 8,754
Sigh. I sent both of mine in, I decided my odds were better of not getting cancelled if they actually had my cameras there. Meanwhile it's just me and "Koi" (my K-01) to take photos with.
Forum: Pentax K-01 10-16-2018, 07:44 PM  
Is the K-01 still worth buying in 2018? Hell yes!
Posted By jbondo
Replies: 22
Views: 3,790
The only apsc body I did not sell when I bought a K-1 (two actually) was my black K-01.


People aren't intimidated by it because it doesn't look like a 'serious' body. It's particularly easy to bring into concerts and public events where other bodies would be prohibited.


It's an absolute joy with smallish manual lenses (A50/1.2 my fave) and the limiteds.


It's light weight and mirrorless design makes it great mounted on a telescope.

I won't be selling it any time soon.
Forum: Sold Items 10-10-2018, 05:04 PM  
For Sale - Sold: SMC Pentax-DA 40mm F2.8 XS (Scarce Silver K-5 Limited edition)
Posted By jbondo
Replies: 4
Views: 1,004
Bump!
Forum: Sold Items 10-10-2018, 05:04 PM  
For Sale - Sold: SMC Pentax-A 1:4 200mm
Posted By jbondo
Replies: 6
Views: 1,052
BBBump! It's a really nice copy.
Forum: Pentax SLR Lens Discussion 10-09-2018, 04:22 PM  
DA 35mm 2.4 or 50 1.8 for first non kit lens and concert/bar band photography
Posted By jbondo
Replies: 37
Views: 1,877
Fellow Musician (I play in two bands) here.


At smaller / mid sized club venues, and for 3+ member bands

The 35 will have a lot more utility than the 50.

They both have similar light gathering power (even though the 35 is slower, it has a much wider angle of view)
the 35 will be a little more forgiving with focus / DOF


For larger venues (or where you cannot be close to shoot) or smaller 1-2 member bands:
The 50 may be a little better.

Also the 50 can also be better if your subjects are really still and don't move much, you can go for shallow DOF.


Here's a sample vid with 7 camera angles of which 3 are Pentax: K-1(31/1.8) K-1(DAF50/1.4) K-01(8/4 fisheye (de-fished))
Forum: Digital Processing, Software, and Printing 10-09-2018, 03:34 PM  
The Squirrel Mafia's RawTherapee thread. Now with 50% more excellence & win!
Posted By jbondo
Replies: 574
Views: 73,602
Same here. Linux user. I am missing something? I read a long time and was unable to determine where to obtain the dcp files that are repeatedly referred to. Other than that, I am greatly enjoying the program and greatly appreciate this thread.
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