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Forum: Pentax SLR Lens Discussion 1 Day Ago  
Wide lens for shooting insides museums and such
Posted By dms
Replies: 35
Views: 1,016
very wide and a fisheye does better --after using software fisheye hemi--than comparable rectilinear lens. Actually a FF fisheye on an APS-C sensor is quite nice, and (w/ my 16mm FE on APS-C) is probably (not actually measured but my sense of it) comparable to about 15mm non-FE.
Forum: Photo Critique 1 Day Ago  
Abstract Vignette or Not?
Posted By dms
Replies: 4
Views: 217
Prefer with vignette--less distraction of surrounding elements--especially the feet (?) below the body.
Forum: Troubleshooting and Beginner Help 4 Days Ago  
Pentax F 17-28 Fish Eye Focus Ring / Distance Scale
Posted By dms
Replies: 8
Views: 457
I also have the same problem w/ this lens. Infinity at 17mm is at about 1.55 ft, while at 28mm it is 3.1 ft. Since I can focus at infinity at all FL's and the DOF is large, I am leaving it this way.

I purchased it as UG from KEH and it was perfect except for this fault. I would think they would have fixed it if it was a simple procedure.

BTW the AF is accurate as far as I can tell, just the indicated distance is wrong, and it cannot focus very close--especially near the wide end.
Forum: Pentax DSLR Discussion 5 Days Ago  
The Kingdom of DSLR
Posted By dms
Replies: 50
Views: 2,138
So long as a segment of photographers require or think they require dslr,** Nikon, Canon and/or others besides Pentax** will continue to provide same.
** IMO the dslr will always have several advantages for sport/theatre/and the like. And Pentax apparently (but I only tried AF a bit w/ my K-5's, so anecdotal) has not provided adequate AF for these applications. [When I want AF I use Nikon D700's.]
Forum: Troubleshooting and Beginner Help 5 Days Ago  
Tele converter
Posted By dms
Replies: 13
Views: 649
Since the TC enlarges the image, the part that reaches the film/sensor is lower in intensity. A 1.4x TC enlarges linear dimension by 40% and thus the total area (if it was all captured) is double [1.4 x 1.4 ~2], thus the light intensity is 1/2 and thus 1 stop more exposure is required. If a 2x TC, the area is 2 x 2 =4 or 1/4 the intensity, and thus 2 stop more exposure is required.
Forum: Troubleshooting and Beginner Help 6 Days Ago  
Disappointing ricoh gr iii image quality
Posted By dms
Replies: 21
Views: 1,008
From EXIF you have iso 100, 1/1000 s, and f/2.8, which would suggest (for example for slide film) about 1-2/3 stop more exposure than full sun—or about right for partly shade setting or cloudy dull condition. But with the digital image (if noise in the shadows is a concern) you should consider raising the exposure for the shadows and not blow the highlights.

This is something you need to try in pp till you have figured out what exposure increase is right for you. And it will depend on the DR of the scene, but you likely can get a value that usually works. Another issue is whether that is okay using matrix metering vs center weighted--but again some experimenting will sort it out--and that is the beauty of digital--you can immediately assess it.
Forum: Troubleshooting and Beginner Help 6 Days Ago  
Disappointing ricoh gr iii image quality
Posted By dms
Replies: 21
Views: 1,008
I also think it is underexposed, by lot, unless you already reduced exposure in pp. Suggest you open the raw file and add exposure till you blow out one of the three colors. That should suggest how much increased exposure would be too much. Of course it depends on the image but you can estimate after that, or review the image and and adjust the exposure (jpg on LED and raw have different headroom but likely small difference).
Forum: Troubleshooting and Beginner Help 07-27-2020, 01:35 PM  
K1000 lenses for a novice
Posted By dms
Replies: 21
Views: 798
The quality of the f/2 50mm is generally considered to be fine, and in fact for close up photography (w/ teleconverter or diopter lens or extension tubes) it is probably as good as you can get short of getting a macro lens. Only you know if the 1 stop** difference is important--but likely not. But using f/1.4 or f/2 on the faster lens may make the out of focus areas look different/better (bokeh) but since you don't mention this it likely is not a consideration at this point. Usually buying a "better" lens or "better" dslr does very little compared to better technique and better post processing the images.
**My bad, should be 1 stop.
Forum: Pentax DSLR Discussion 07-24-2020, 08:04 AM  
Why you don’t really want a hybrid viewfinder
Posted By dms
Replies: 36
Views: 2,141
I find an adjunct optical finder (e.g., Voigtlander) works well for theatre work, on my dslr w/ wider angle lens. (I use for FF equivalent of 35mm and sometimes 28mm.) The optical finder lets me see/ anticipate what's coming into the frame.
Forum: Pentax Camera and Field Accessories 07-18-2020, 08:36 PM  
Adaptist PK+MM installation and usage
Posted By dms
Replies: 50
Views: 1,510
My two favorite Nikkor lenses are a fisheye and a micro (nikon's usage for macro if m
nikkor 16mm f/3.5 fisheye, although the Pentax 16mm f/2.8 is comparable--I have both. My feeling is the Nikkor is nicer but I am comparing use on a D700 versus cropped sensor Pentax, so not really much basis.

nikkor micro 55mm f/3.5 or 2.8--I had the f/3.5 and have the 2.8. They are both exceptional (and this was mostly for non macro usage), although I preferred the f/3.5. Compared to the closest Pentax offering--the 50mm f/4 (I have the K version)--I think the Nikon is better (actually much better)**--although there is no A to B testing and I did not use the Pentax much--and did/do use the Nikon a lot but only on film.

Actually, the 28mm or 35mm PC lens by Nikon are reasonable in price now, and are smallish sized lenses. I have both. I especially like the size and design of the 35mm f/2.8. It would be a good general purpose lens to have for scenery/travel with the advantage that it also is PC. I just have not had the chance yet to use it this way--although on the cropped Pentax sensor 35mm is less desirable vis-a-vis PC.
** I have been thinking about what I said and it is w/o much basis. I have only very limited use of the Pentax 50mm f/4 macro--basically of a city scene that I take with all my lenses--and the Pentax seemed to be dull/lack contrast. So let me just say I like the Nikkor 55mm micro, and I have too little experience w/ the Pentax to compare them.
Forum: Pentax SLR Lens Discussion 07-18-2020, 03:02 PM  
Cheap, Decent Wide Angle Lens
Posted By dms
Replies: 37
Views: 1,515
Retrofocus design leads to easier handling of even illumination and can be acceptably high in resolution. And how does one get a wide angle on a dslr with the large distance to the film/sensor otherwise?

I generally print about 8"x12" and occasionally 13"x19" and the older lenses such as I mentioned do fine. I have done a few at 2 ft x 3 ft and I am sure one of the lenses used was Pentax Super Takumar pre SMC 28mm f/3.5. Basically for most prints essentially any lens will be satisfactory as regards resolution--so long as one is not staring at the computer screen and comparing lenses at 100%--which is not very meaningful for the size prints most of us make.

It may not work for you, likely b/c you print large and/or have very high resolution/contrast standards, but for many of us the older lenses actually produce more pleasing images. And they are more fun to use: less expensive and smaller. Quite a kick using a 5 decade old lens that handles so smooth, and has all the information and control one wants on the lens itself, and makes images we appreciate. Different horses for different courses.
Forum: Pentax SLR Lens Discussion 07-17-2020, 08:46 PM  
Cheap, Decent Wide Angle Lens
Posted By dms
Replies: 37
Views: 1,515
As regards "what's the best cheap lens of around 20-30mm focal length" there are many used MF 24mm f/2.5 ~ 2.8 lenses and they would be inexpensive and fine quality. E.g., the 24mm f/2.8 Pentax (K). For about [50% to 100% more]** expense a Pentax F 28mm f/2.8 or FA 28mm f/2.8 would also give you AF, and still probably 1/3-1/2 of what the 20-40mm lens would cost and probably comparable or better quality image.
** Actually the 28mm AF would be comparable or lower in cost than the 24mm, but it is less wide. KEH has the 24mm K f/2.8 for about $180 and the FA 28mm f/2.8 for about $130.
Forum: Pentax SLR Lens Discussion 07-11-2020, 02:53 PM  
Recommend a long, cheap telephoto please
Posted By dms
Replies: 36
Views: 1,602
Try the soligor 2x TC. You never can be sure in advance how well or poorly the lens + TC combo will be.
I have the 1.4x tamron AD-2 TC, and I think you are as likely to have good results w/ a non-AD-2 coupling, and more versatility, as Tamron AD-2 TC only works with AD-2 lens (as you knew).
Also if getting the AD-2 1.4 x make sure it works with AD-2 lens you are getting. As I recall it is not all of them. (Look at the adaptall-2 site.)**
** dme posted on the reviews of the 140F TC and says it works with the lens you are considering. He discusses many of the lens+140F combo's.
Forum: Photographic Technique 07-10-2020, 10:01 AM  
Photographing Glass (lenses etc actually)
Posted By dms
Replies: 7
Views: 506
I don't do it, but a perspective control shift lens should work.
Also polarizing sheets in front of lights and polarizing filter on the lens--a set up I use for copying art with glare (e.g., acrylic) and thus I should think it would do same w/ glass.
Forum: Pentax SLR Lens Discussion 07-09-2020, 06:13 PM  
Recommend a long, cheap telephoto please
Posted By dms
Replies: 36
Views: 1,602
Although I have not used it (I have several adaptall-2 SP lenses) the adaptall-2 60-300mm f/3.8-5.4 is well thought of and would fit any of your cameras. KEH has one in EX condition for about $60. The 300mm f/5.6 comes up regularly and is also close focusing. They are both SP (top of their line) lenses and can be adapted to any of the common brands. Adapters are usually about $10-20, except Pentax KA, which is likely about $50.
Forum: Pentax Compact Cameras 07-06-2020, 02:54 PM  
ricoh gr ii vs pentax q7
Posted By dms
Replies: 7
Views: 606
As said totally different, so I suggest you figure out what works best for you independent of each other.

For me the handling of the Q and the ability to use a fish eye, 35mm (FF) equivalent and aux. optical viewfinder, and about 50 mm equivalent and aux. optical viewfinder, is more/most important.** Image quality for me is more than good enough so long as I am not doing low light (night time, theatre, etc.). And the 28mm equivalent lens is "nowhere" for me.

Handling and confidence in/liking the camera (the "Halo Effect," from supervision/management) usually leads to better images (IMO) than lens/sensor capability. But having the right FOV is paramount (again for me).

** Of course the Q7 has a larger sensor so those FF equivalents will be quite a bit wider. So for me except for the fish eye I would stay with the Q.
Forum: Pentax SLR Lens Discussion 06-19-2020, 12:49 PM  
DA 35mm, hood, filters
Posted By dms
Replies: 10
Views: 561
If the filter is in front of the hood, it will increase lens flare.

Also, further in front of the lens, the more it should affect lens QA, but (for me) how much is hard to say.

If you try filter, you can see and then limit use of filter to times when benefits outweigh negatives (which is always the way to assess filter use IMO).

(But best is to use a better hood design.)
Forum: Pentax K-r 06-18-2020, 08:37 PM  
Kr blur is testing my patience.
Posted By dms
Replies: 27
Views: 1,032
Also I would not use the AF/in focus beep. Unless it is confirmed to be spot on for the lens you are using. AF (and thus the AF beep w/ manual focus) is more likely to not be critically accurate.

Trust your eyes instead. Although it (manual focus) could be off, it is unlikely if the screen was not changed.
Forum: General Photography 06-15-2020, 10:38 AM  
What is your other camera ?
Posted By dms
Replies: 49
Views: 1,866
theatre work: mostly 2 Nikon D700** and 2 Pentax K-5
everyday: mostly Pentax Q
film: mostly Pentax MZ-S, Nikon FM-2 and Nikonos III

** After 8 years w/ Pentax digital I wanted FF and use of several excellent older Nikon F mount lenses, so the D700. It was inexpensive and has excellent DR, AF, build, etc.
Forum: Pentax Camera and Field Accessories 06-05-2020, 06:15 PM  
Need help, I mounted my ND-filter on my UV-filter and can’t get if off...
Posted By dms
Replies: 14
Views: 718
If all else fails, with a small saw, or file, you can gently cut thru the UV filter ring, and then pry it away from the ND filter.
Forum: Digital Processing, Software, and Printing 06-05-2020, 07:54 AM  
Printing for beginners - dark prints
Posted By dms
Replies: 18
Views: 1,046
While true, that prints are seen from reflected light, "Hint: no brightness adjustment" is IMO at best confusing.

One still needs to view by transmitted light on the monitor. And adjusting brightness (exposure) for the screen image needs to correlate with the look of the print. Lowering monitor brightness makes one increase image brightness as part of processing it--and thus a lighter print.
Forum: Digital Processing, Software, and Printing 06-04-2020, 03:36 PM  
Printing for beginners - dark prints
Posted By dms
Replies: 18
Views: 1,046
I would just reduce the monitor brightness, adjust the image to what looks good, and print. If still too dark, reduce monitor more. This should get you most of the way/good enough. For example my MacBook Pro, is very bright, and I set the brightness down quite bit. About 4 stops or 6%.
Forum: Pentax Camera and Field Accessories 05-29-2020, 08:53 AM  
the big grey box project - or where am I going to store 50+ lenses and the rest of it
Posted By dms
Replies: 41
Views: 2,904
I just cut long rectangles of corrugated cardboard and cut vertically halfway thru and combine them (opposing slits) into semi rigid network. Cheap and high lens density.
Forum: Lens Clubs 05-23-2020, 05:52 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By dms
Replies: 3,665
Views: 648,133
I don’t know many of you are aware of/have read the Ricoh featured product about the 10-17mm FE. Featured02?HD PENTAX-DA FISH-EYE10-17mmF3.5-4.5ED? | About HD Coating / Lenses / Products | RICOH IMAGING
I wasn’t and it is excellent and informative. The following were noteworthy for me:

1. Original 17-28mm FE was developed by converting an ultra-wide-angle zoom lens into a fish-eye zoom lens, and the reasons/advantages.

2. detailed angle of view data for 10-17mm FE (horizontal, vertical, diagonal) at various FL’s on FF and APS-C format.

3. One of the featured photographers (Takuma Kimura) commenting on using the fish eye said: “I can minimize the effect of distortion by … using the camera’s Composition Adjustment function, I can shift the horizontal alignment up and down to avoid placing it in the middle of the image.
Forum: Pentax DSLR Discussion 05-16-2020, 11:42 PM  
Pentax K-5 replacement - 3 possible cameras
Posted By dms
Replies: 26
Views: 1,333
And why not get another K-5? You like it, the cost is low, and if you have case where you want to use 2 cameras--they are identical which can be an advantage/less likely to make an error. Or (even better?) do as btnapa suggested above.**
** I shoot theatre and I worry about clothing creating moire problems, and the K-5 resolution is fine. But maybe/usually this is not a concern.
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