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Forum: Contest Voting 9 Hours Ago  
Ship Rock
Posted By othar
Replies: 2
Views: 31
I would like to nominate this photo
Forum: Troubleshooting and Beginner Help 15 Hours Ago  
Extension tubes and aperture control.
Posted By othar
Replies: 9
Views: 393
With Av or similar progam modes it defaults to wide open, with M mode the default should be fully closed -> but that is in my experience equally bad ;)
Forum: Troubleshooting and Beginner Help 15 Hours Ago  
Extension tubes and aperture control.
Posted By othar
Replies: 9
Views: 393
The simplest way for using a lens without aperture ring with extension tubes (and as mentioned probably the most expensive, because they are rare) would be to use extension tubes (or de-glassed tele-converters) that allow aperture controll through the camera.
If you plan to use your extension tubes only with a single lens (the one without aperture ring) you can emulate the aperture controll with non-conductive tape or paint by applying this on your extension tube mount so the camera can read your maximun and minimum aperture of this lens (but except you remove and re-apply the tape everytime you use this lens, this will limit the usabillity of your extension tubes to 1 lens or at least to lenses with the same maximum and minimum apertures)


I think the most economic way will be to buy a old manual prime lens with aperture ring to use with your extension tubes (I sometimes use a Cosina MC Cosinon-T 135mm 1:3.5 with my extension tubes, the lens was even cheaper than the tubes, but it gives good results)

Cosina MC Cosinon-T 135mm 1:3.5 with extension tubes:
Dragonfly
Forum: Contest Voting 4 Days Ago  
Staircase
Posted By othar
Replies: 7
Views: 100
Staircase in the statehouse of Upper Austria in Linz.


Forum: Troubleshooting and Beginner Help 06-20-2020, 06:27 AM  
Clean lens element
Posted By othar
Replies: 5
Views: 560
It probably will be easier to grab the black cylinder when there is more space to do so, but I think you should be able to unscrew it without removing the mount.
Forum: Troubleshooting and Beginner Help 06-20-2020, 01:43 AM  
Clean lens element
Posted By othar
Replies: 5
Views: 560
Have you tried to unscrew the black cylinder. My guess is that you remove the whole rear glas element that way and can then dismember the glas elements.
Forum: Pentax SLR Lens Discussion 06-15-2020, 02:09 AM  
16-85 off... other choices?
Posted By othar
Replies: 22
Views: 1,239
If the wide end is not that important to you, how about an old F 35-70mm lens, very cheap and usually sharp for APS-C sensor size.
And when your 16-85mm lens gets back and you should deside not to keep it, you probably can resell it without much loss.

edit: Admittedly for portrait photography you might need a faster lens.
Forum: Pentax SLR Lens Discussion 06-09-2020, 03:21 AM  
Landscape lens question
Posted By othar
Replies: 24
Views: 1,207
I would never use my 8mm fisheye lens wide open, but at f5.6 up to f8 (beyond that I start to see diffraction) you should get sharp images with it. What I did notice: for a final judgement of image sharpness of this lens always check on your monitor at home and not the preview of the camera, because of the way the preview image is processed in the camera the images look way softer in preview than they do on my PC (I shoot RAW not JPG).
It happens very often, especially with my 8mm and my 35mm lenses from Samyang, that I initially think all pictures are out of focus or otherwise soft when watching the preview and they turn out to be nicely sharp after importing to LR.


As others have mentioned you also have the possibility to stitch images together to get a wider field of view. (If you use Adobe CC you have a stitching software already included in LR if I am not mistaken; I use an older version of LR so I use Hugin for stitching which is a freeware, but there are many more programs you can choose from)
Especially for landscapes where in my experience tends to be not much movement stitching is a viable solution (but try to keep steel ropes or power cords in a single image of the stitch if possible, those make the most problems for the software in my experience).
For astro work stitching will be still possible but I assume it will be easier to get it right in a single shot, so you might consider a wider lens for this usage.

Here is an example for stitching (I think I stitched this from 39 single images):



and some more if you are interested:
Stitches | Flickr
Forum: Monthly Photo Contests 06-09-2020, 02:33 AM  
Bromelia
Posted By othar
Replies: 16
Views: 159
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:32 AM  
Locked in Dandelion
Posted By othar
Replies: 18
Views: 144
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:32 AM  
Flower in Flower
Posted By othar
Replies: 29
Views: 162
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:31 AM  
Crocus
Posted By othar
Replies: 35
Views: 208
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:31 AM  
May 2020 "Flowers"
Posted By othar
Replies: 12
Views: 200
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:30 AM  
Claret Cup Cactus
Posted By othar
Replies: 35
Views: 271
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:30 AM  
Lotus Blossom
Posted By othar
Replies: 39
Views: 264
I would like to nominate this photo
Forum: Monthly Photo Contests 06-09-2020, 02:29 AM  
Smells like May
Posted By othar
Replies: 5
Views: 68
I would like to nominate this photo
Forum: Lens Clubs 06-03-2020, 10:03 AM  
The M Club!
Posted By othar
Replies: 8,219
Views: 1,200,902
I used an off camera flash, but I was cleaning the lens elements and had them removed before the shot :)
Forum: Mini-Challenges, Games, and Photo Stories 06-03-2020, 09:07 AM  
Thematic Almost (but not quite) monochrome
Posted By othar
Replies: 88
Views: 2,480
K-3 + M 50mm Macro f4

Diaphragm of a "A.Schacht Ulm Praktica-Travenar 1:3.5/135 R" lens.


Forum: Lens Clubs 06-03-2020, 09:05 AM  
The M Club!
Posted By othar
Replies: 8,219
Views: 1,200,902
K-3 + M 50mm Macro f4

Insides of an "A.Schacht Ulm Praktica-Travenar 1:3.5/135 R".


Forum: Lens Clubs 06-03-2020, 09:03 AM  
The Pentax M50 f4 macro lens club
Posted By othar
Replies: 28
Views: 2,587
K-3 + M 50mm Macro

Forum: Pentax K-1 05-31-2020, 03:37 PM  
K-1 with M-Lenses and Auto Extension Tube
Posted By othar
Replies: 8
Views: 537
No, pin number seven (or V in the picture) was enough for my tubes to work.
Forum: Troubleshooting and Beginner Help 05-30-2020, 02:30 PM  
Multiple exposures
Posted By othar
Replies: 3
Views: 413
If I am not mistaken you have to press the shutter button for every exposure in multi-exposure mode (to combine two images like the sky and a portrait or something like that).


What you are probably looking for is the interval-multi-exposure mode.
edit: with this mode you can set the number of exposures your camera should combine and also the time period between each shot and the camera will then shoot all pictures on it's own after starting the intervall with your first actuation.
This way you can simulate ND-filters when photographing a continuus movement like waterfalls for instance.
Forum: Pentax K-3 05-30-2020, 02:05 PM  
Lester Dine 105mm on K-3 Question
Posted By othar
Replies: 39
Views: 885
No, this information is required for the shake reduction system of the camera (if the value is too high for your focal length the sensor might overcompensate for your camera movement and you can get even less sharp images than without SR, if the value is too low the camera doesn't compensate enough for your movement - 100 is fine for your lens though).
It also shows up in your exif data of your images so you can more easily determine which lens you used to create a certain image.



Yes.
For older SLRs that couldn't control your aperture on there own, you had to set your desired aperture by turning the aperture ring to a certain position. The problem of third steps (or even smaller steps) is that the mental calculation for your correct exposure is not that handy (and you also had a limited amount of manually adjustable exposure times) and the expectable impact on the resulting image of such small aperture steps is also not that big. Therefore it was/is more convenient to limit your manually adjustable aperture settings on your aperture ring to half stops (on some lenses only full stops). Nevertheless those aperture values are usable for your camera if the aperture ring of your lens has an A-position and is set on this position, otherwise you have to set your desired aperture on the lens and use green-button metering in M-mode on your camera (or a rule of thump like the sunny-16-rule) to get your correct exposure values.
Forum: Pentax K-1 05-30-2020, 01:45 PM  
K-1 with M-Lenses and Auto Extension Tube
Posted By othar
Replies: 8
Views: 537
Yes it is the problem. I had the same issue with my Kenko branded extension tubes.
The good news is, you don't have to remove the whole paint, just a tiny area (where the pin of the camera mount is checking for conductivity (the lowest pin with the slight gold stain))
If you are not sure where exactly, you can test the position by sticking aluminium foil between the camera and extension tubes when mounting.
Forum: Pentax DSLR Discussion 05-25-2020, 10:45 AM  
Astrophoto anomaly
Posted By othar
Replies: 21
Views: 1,105
May I hint back that you should read the second and especially third paragraph before disregarding an admittedly highly speculative reply ;)
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