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Forum: Travel, Events, and Groups 2 Days Ago  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 10-24-2017, 02:14 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 10-21-2017, 04:57 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Excellent. I have one on the shelf but have never used it.
Forum: Photographic Technique 10-13-2017, 02:49 PM  
DSLR Sensor's resistance to Sun shots
Posted By pixelsaurus
Replies: 15
Views: 844
I burnt a hole through the cloth shutter of a Practika Nova B back in the day. I repaired it with a piece of cloth sticking plaster and a black sharpie. Worked a treat but not recommended.
Forum: Travel, Events, and Groups 10-04-2017, 07:56 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 10-03-2017, 02:12 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Yeah right!
Forum: Travel, Events, and Groups 10-02-2017, 04:05 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Cheers.
Forum: Travel, Events, and Groups 10-01-2017, 09:00 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
bif ?

---------- Post added 2nd Oct 2017 at 05:04 PM ----------



Now if you could just paint the thing with vantablack.

See Vantablack 2.0, the New Black So Black It Eats Lasers | artnet News
Forum: Travel, Events, and Groups 10-01-2017, 04:11 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
I doubt if any earthbound telescope will ever image any bits left behind on the moon. Atmospheric turbulence and diffraction would make any images all but useless.
https://www.nasa.gov/mission_pages/LRO/news/apollo-15.html
Forum: Travel, Events, and Groups 08-23-2017, 05:09 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Ross, sorry to hear of your loss, Ross. Condolences to you and your family.
Forum: Travel, Events, and Groups 08-01-2017, 05:31 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
I use on camera flash, and I hardly ever use that. Sorry.
Forum: Troubleshooting and Beginner Help 07-14-2017, 01:45 PM  
K-50 Dark Images
Posted By pixelsaurus
Replies: 7
Views: 344
I have this issue with my K-500. I finally determined the DLI109 battery was the culprit. Even fully charged, it would no longer power the camera properly as I continually got a low battery warning. When I got the camera, I also bought an AA battery clip. Dry cells (AA) worked ok for a while and then the dark frames appeared again. I finally settled on Eneloop NiMH AA rechargeables and have no issues since. I'm sure now my issues with dry cells was due to a rogue batch.
Forum: Travel, Events, and Groups 07-13-2017, 04:41 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Welcome.

---------- Post added 13th Jul 2017 at 11:43 PM ----------


Cheers. How to you find the K-500?
Forum: Travel, Events, and Groups 05-26-2017, 12:35 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 04-08-2017, 06:19 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 04-07-2017, 11:47 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Yes. The shorter exposures also assist in controlling noise. Most astros seem to shoot in roughly 3 minute exposures for faint objects. Longer exposures as well as burning out the stars, also generates noise. There is a law of diminishing returns for exposure and it seems beyond 3 minutes offers little benefit. For the brighter DSO's (Deep Sky Objects such as the Great Nebula in Orion), they include exposures down to 5 secs or so in the stack. Some astros such as Rolf Wahl Olsen and Sara Wager, to mention two, often stack images where the total exposure runs to over 100 hours. Of course they don't use DSLR's but dedicated monochrome CCD cameras and narrow band filters.This is a whole different type of photography.




I would hazard a guess and say things like Helicon Focus and Zerene Stacker use different criteria to stack. Maybe something to do with contrast.
Forum: Travel, Events, and Groups 04-07-2017, 12:23 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
The problem with astrophotography is that the night sky has a huge dynamic range, probably in the range of 1:squillions. No film or digi sensor can adequately cover it. Sometimes those digi astrophotog fellas will shoot some short exposures (records star colours but with little background detail) to stack along with their longer exposure frames (overexposed bright stars but plenty of background detail). It helps to preserve the colour in the stars.

Rolf does a good job in that respect.

Nebulae - rolfolsenastrophotography

Jerry has words to say as well: Recording and Enhancing Star Colors

You can buy actions for PS to pull out star colour as well.

Enterprise Astronomy & Photography | Annie's Astro Actions

Astronomy Tools Actions Set by ProDigital Software
Forum: Travel, Events, and Groups 04-06-2017, 05:18 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Yes, and don't forget the eyepiece as well. You don't have to do darks at the same time as astro shots. You can effectively do them anytime so long as they are shot at same temperature as the "lights".



Some use ICE and others use Hugin. Some freebie editors such as IRIS ( Iris software ), it is an unwieldy beast but it may do the job. The weird stretching may have something to do with lens distortion. There is a facility to correct image distortion in IRIS. It is a mathematical approach rather the the PS sliders but tuts are useful.

You may want to consider a barn door tracker. There are designs all over the net but this is one example: http://garyseronik.com/a-tracking-platform-for-astrophotography/


No idea at the moment. I don't use the K-500 all the often at the moment but I suppose a couple of hundred for the dry cells. I would expect more for the alkaline.

Sorry for the delay in replying but I have had to reinstall Win 10 as my internet was rubbish. All seems good now.

---------- Post added 7th Apr 2017 at 12:41 PM ----------



Possibly. I never comment on colour issues as I have that red/green (or is it a blue problem?) thing going on. Short exposures will preserve colour as saturation will make all stars white. Also shooting stars slightly out of focus will also help preserve colour.
Forum: Travel, Events, and Groups 03-30-2017, 01:29 PM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Welcome to the Dark Side. Processing astro is a whole different ball game. Dark frames,flats, offsets, and stacking are the new buzzwords. Deep Sky Stacker is a freebie and the manual should point you in the right direction: DeepSkyStacker - Free

Jerry may also be able to help you: Catching the Light - Astrophotography by Jerry Lodriguss
Forum: Travel, Events, and Groups 03-28-2017, 03:02 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
I am currently having the same issues with my K-500. AA's do work but don't use the Panasonic Heavy Duty Dry Cells. They are good for 3 or 4 frames before the cam spits up a battery depleted message. The Eveready Heavy Duty dry cells lasted a while but now I have alkaline installed. Incidentally, my AC power supply does not solve the the aperture issue, obviously it is a bit short on ergs.
Forum: Travel, Events, and Groups 03-17-2017, 02:46 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
This is the TradeMe listing, some interesting kit. Scoot down to the Questions and Answers.

Massive Camera collection + Lenses & Accessories | Trade Me
Forum: Travel, Events, and Groups 03-17-2017, 02:23 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Forum: Travel, Events, and Groups 03-11-2017, 02:28 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
I am not a big fan of PS or any digital editor though they do have their place. Making an unsharp mask the old way involved rotating turntables, sheet film, complete darkness except for a low wattage light source for making the out of focus positive from the original negative. Digital is so much simpler and less messy both in time and material.
I still try to adhere to the shoot it once and get it right maxim though digi does give you the opportunity to experiment.
Good idea on keeping notes though don't miss a shot because of it. Also if you have a hand held meter, try to guess the exposure without referring to it but use it as a check. Most of the old boys didn't have meters so it was mostly guess work. I'm not so sure I could do that anymore. If you can guess the exposure correctly, it won't matter if the cam battery dies.
Forum: Pentax K-1 03-10-2017, 11:21 AM  
What is this odd anomaly in my image?
Posted By pixelsaurus
Replies: 44
Views: 2,313
Rods. It is the only explanation that fits. :lol:

Flying Rods
Forum: Travel, Events, and Groups 03-10-2017, 03:59 AM  
Kiwi Pentaxians
Posted By pixelsaurus
Replies: 14,432
Views: 767,354
Filters are fun too. Red will leave you with dark skies, white clouds and dark foliage. Green and yellow will even out the tones and give you a more "natural" tonal range.

Books have been written on this stuff:

www.kodak.com/KodakGCG/uploadedfiles/motion/US_plugins_acrobat_en_motion_education_sensitometry_workbook.pdf

---------- Post added 11th Mar 2017 at 12:34 AM ----------



Except for reversal process ie B/W and colour slide, film is fairly resistant to over/underexposure. It was the original HDR medium without the hoopla. There is always a optimum ISO for the particular film type but if you do get the exposure wrong, all is not lost. You can make some compensation when you process the stuff. Additionally you can compensate when printing. If you underdo the shadows, there is little info that you can pull from it but overexposing is not a big deal. Even "black" highlights on the negative can have exquisite detail teased out of it by using the "original photographic" unsharp mask. This is why the old film boys exposed for the shadows.

Underexposed negatives can get the treament to pull out some detail. Chemical treatment may help but clever lighting of the negative and rephotographing it is also an option.

If you are interested in a digital version of an unsharp mask, Jerry has done the hard work for you.

Real Digital Unsharp Masking
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