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Forum: Pentax SLR Lens Discussion 02-08-2015, 02:39 PM  
Tamron 70-200 with new Pentax HD 1.4x TC
Posted By valy
Replies: 3
Views: 1,386
Yes: k5iis - tamrom 70-200 f2.8 - pentax tc 1.4x. My conclusions:
- focus is slower
- hunting, too much hunting (planes on the sky, birds on shade), most of the time I've managed to get the focus using non central focus point only, otherwise just hunting
- surprisingly sharp at infinity, actually seems that is more sharper than without TC (tried at 200mm on Moon or other distant objects)
- softer for close focusing
- no other problems.
Forum: Pentax News and Rumors 04-07-2014, 03:10 PM  
Z countdown
Posted By valy
Replies: 289
Views: 38,765
Zi day, zi last day, lunar eclipse at that moment: Apr 15, 2014 Total Lunar Eclipse , the 645 eclipses everything or it will be just eclipsed, depending on location.
Forum: Pentax News and Rumors 04-06-2014, 03:47 PM  
Z countdown
Posted By valy
Replies: 289
Views: 38,765
Z is how the screen looks from a side:
Forum: Pentax K-5 & K-5 II 04-03-2014, 01:27 PM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
Science is more interesting than some nice-looking images :)
Finally I've decided to use the astrocamera for this, is more flexible/controlable.
Forum: Pentax K-5 & K-5 II 03-31-2014, 04:51 AM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
Actually I want such of this: http://arxiv.org/pdf/astro-ph/0111022.pdf
A mask infront of the telescope, image a little bit defocused and take a movie.
Forum: Pentax K-5 & K-5 II 03-31-2014, 02:07 AM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
Actually I want to film the seeing variations (air turbulences) at high fps (25-30 is max for k5), I need a bigger sensor (more surface) than my astro CCD camera which has only 640x480px. Examining the movie I've noticed that is pure black, no noise, perhaps the camera didn't raise the iso. I don't mind having noise since there is also usefull signal into the movie.

With my astrocamera I've managed to have a lot of signal at 30fps (0.03 ms exposure) and gain ~800 (from 0-1000 range) and it has almost the same pixel size and sensibility as k5 sensor, this on faiter star. So I expect the k5 is capable to get some white pixel at least on Jupiter which is brigter. I feel there is a missing setting but there is no actual settings to do, all is automatic. I'll try the user mode trick to force it to raise iso and set exporure 1/30s.

On the other hand, on photo mode - live view there is my star visible, so the sensor is capable to catch the light very well, but not in movie mode.
Forum: Pentax K-5 & K-5 II 03-30-2014, 05:43 AM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
I want to record 30fps, don't care the playback, just to record some signal.
Forum: Pentax K-5 & K-5 II 03-29-2014, 04:09 PM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
I want real 30fps, or 25, meaning I want to aquire 25-30 frames per second.

So there is no way to set iso 51.200? How live view does to get proper images of faint objects and the movie mode don't?
Forum: Pentax K-5 & K-5 II 03-29-2014, 03:48 PM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
No stills, no timelapse, just movie because I want 30fps.
Forum: Pentax K-5 & K-5 II 03-29-2014, 02:56 PM  
Filming stars
Posted By valy
Replies: 14
Views: 1,126
Tried to film stars (with kIIs) and got dark imges. While setting foto mode (Av, M, etc), the live view shows overexposed stars but switching to movie, live view and the record is blank even if I set +2 exposure compensation. Am I missing something?
Thanks.
Forum: Pentax K-30 & K-50 02-26-2014, 08:55 AM  
Good inexpensive super wide angle lens for landscapes
Posted By valy
Replies: 12
Views: 5,450
Forum: Pentax K-5 & K-5 II 02-22-2014, 04:01 AM  
K-5 For Astrophotography
Posted By valy
Replies: 1,118
Views: 314,706
fps+large buffer=love















You Tube



Forum: Pentax K-5 & K-5 II 02-13-2014, 02:44 PM  
Post Your K5IIs Pictures Here!
Posted By valy
Replies: 2,666
Views: 438,624
Some iso6400, pretty mush isoless, isn't it?
Forum: Pentax K-5 & K-5 II 02-06-2014, 02:22 PM  
K-5 For Astrophotography
Posted By valy
Replies: 1,118
Views: 314,706
Because you don't have it :)
The same as the case when you close the aperture in the 15mm LTD to get those beautiful star effects.
Forum: Pentax News and Rumors 02-05-2014, 03:27 PM  
HD Teleconverter Officially Announced
Posted By valy
Replies: 461
Views: 61,207
What this means: "3* Could be out of focus with phase matching AF"?
Forum: Pentax News and Rumors 02-05-2014, 03:16 PM  
Rumor: Rear Converter and 2 P&S cameras
Posted By valy
Replies: 151
Views: 14,348
Hope to solve it in further FW updates.
Forum: Pentax News and Rumors 02-05-2014, 03:10 PM  
Rumor: Rear Converter and 2 P&S cameras
Posted By valy
Replies: 151
Views: 14,348
Forum: Lens Clubs 02-03-2014, 02:00 PM  
Post your 1.2 Photos! (1.2 ONLY!)
Posted By valy
Replies: 2,020
Views: 498,877
Revuenon f1.2
Forum: Lens Clubs 02-03-2014, 09:01 AM  
Tamron 10-24mm club
Posted By valy
Replies: 163
Views: 68,216
Thx!
Yes, can do a lot for le$$. It is a nice replacement for the kit lense.
Forum: Lens Clubs 02-02-2014, 12:34 PM  
Tamron 10-24mm club
Posted By valy
Replies: 163
Views: 68,216
Few from Rome:
Forum: Pentax News and Rumors 01-31-2014, 03:42 PM  
Three rumors of new Ricoh Pentax products in CP+ 2014
Posted By valy
Replies: 517
Views: 98,297
FL is FL, irespective of the sensor. You can crop also from FF selfpleasuring that you "use" a longer FL.
Forum: Pentax SLR Lens Discussion 01-22-2014, 03:58 PM  
Anyone have some input on a 70-200 vs a 70 prime?
Posted By valy
Replies: 20
Views: 2,362
Compared with a prime, tamron 70-200 is big and heavy. Is not fast or silent especially when the light is not so good, sometimes it hunts in such conditions or if you stress it much. No full time manual and the switch from AF to manual means making two actions.
Is a pseudomacro (at 200mm), but with a crop you can get fine details. Optically is very nice. 200 f2.8 could be nice too.
It's a very flexible lense at a ood price, but with some (minor?) disadvantages. Now we have a second versions from Tamron.
Forum: Pentax SLR Lens Discussion 12-24-2013, 03:04 AM  
UWA for Rome
Posted By valy
Replies: 14
Views: 1,569
Brought the tamron 10-24: half the price, more zoom, accepts filters. But sigma 8-16 is full time manual, silent, much wider as I imagined first.
Thanks you all :)
Forum: Pentax SLR Lens Discussion 12-23-2013, 03:02 AM  
UWA for Rome
Posted By valy
Replies: 14
Views: 1,569
Of course I can still use the kit lense as I did from 2006 since now, but then we should forbid such threads: https://www.pentaxforums.com/forums/122-lens-clubs/107938-sigma-8-16mm-club-27.html
Forum: Pentax SLR Lens Discussion 12-22-2013, 03:18 PM  
UWA for Rome
Posted By valy
Replies: 14
Views: 1,569
I know UWA and FE are not easy to use, but some time I miss shorter than 18mm focal lengths. I have 16mm FE on FF film camera.
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