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Forum: Pentax Camera and Field Accessories
10-10-2013, 03:08 AM
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Hello Stone,
yes , I use the IDAS LPS-P2 filter(for slight to medium light pollution ), so i can set the exposure up to ISO4000 F2.8 130sec so far... (W/ DA*200) under light-polluted skies.
attatch:
1. 77mm for DA*200
2. 48mm (modified to 43mm rear filter holder) for Tamron 300/2.8 adaptall
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Forum: Pentax Camera and Field Accessories
10-10-2013, 01:26 AM
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How do you determine the proper exposure for your sub-exposures? Do you want the histogram spike to be just off the left edge?
Do you find that the menu is wildly over-optimistic in what it says your maximum time of exposure is possible?
>>because most the deep sky objects are faint, so i always try to overexpose a bit (just touch the histogram right edge)
to image a faint DSO , I usually set the exposure time at 120sec first (K5 w/ DA*200), then adjust the exposure by changing ISO(mostly) or trace time .
I shoot in RAW+, is that OK?
>>That's ok
Are you going to see results in the JPEGs or only after you have stretched the histogram in post-processing?
>> I always check the object on camera's LCD after every shot, (mostly)You can see the object in image (LCD)
even if the image is full of light pollution. (as attachment image)
Do you turn Auto-ISO off?
>>Auto-ISO Off
I usually set ISO to 1600 or 3200
What about noise reduction?
>>noise reduction Off,
Any other camera menu settings that I should change?
>>Set RAW/Fx button to astrotracer menu
Any tricks for "locking down" your lens focus once you have it? (I'm using manual lenses... trying the K 135mm f2.5 (at f4)
>>use photography tape or any tape to lock the focus ring after you have it .
my tips:
keep repeating the precise calibration until you get the good shot.
use a light pollution filter to combat light pollution.
best regards,
gleeman
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Forum: Pentax Camera and Field Accessories
10-07-2013, 09:37 PM
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hello all,
it works well for my K5 with DA*200
here's my setup and experience
(written in traditional chinese)
Pentax O-GPS1(How to) |
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Forum: Pentax K-5 & K-5 II
01-12-2013, 11:07 PM
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use bright stars as a guide to finding fainter objects, that's call Star hopping
as Stone said, you will need a finderscope and a star map/sky chart(mine is Skysafari+ for iPhone) ,
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Forum: Pentax K-5 & K-5 II
01-12-2013, 10:22 PM
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Hello all, the O-GPS1 is my most favorite gear of 2012:)
Attachment 155231
my setup: Pentax K5 , O-GPS1, DA*200, 7x35 finderscope, Manfrotto 410 Geared Head
Attachment 155233
Rosette Nebula - NGC 2237
(Bright Nebula in Monoceros)
06h31m0s
+05 ˚02'19.5"
w/ LPS-P2 light pollution filter
ISO3200
F2.8
120s
(PS artificial flat-field)
please check my site for more detail |
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Forum: Pentax K-5 & K-5 II
12-06-2012, 05:22 PM
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hello,
a 500mm refractor + 2x will give you 1500mmFL(35) on K5
regards,
?????: Digiscoping |
