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Archiv autora: pavelpech
ASA 3“ Wynne 0.95x Corrector – a Quick Test
Although vast majority of equipment (especially for photographers) that’s today on the market does have plenty of issues or design flaws (I am reasonably critical to almost everything) sometimes it really happens – a miracle. There’s something just perfect, great, … Celý příspěvek
Rubriky: Articles in ENGLISH, Pokusy
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ASA 3“ Wynne + Moravian G3-11000 CCD at F/3.6
I am most probably the first person who has this combo and who discovered a design flaw in G3 series of Moravian cameras. This concerns only full frame (36x24mm) sized chip when it is used with very fast optics (e.g. … Celý příspěvek
Rubriky: Articles in ENGLISH, Pokusy
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CCD Chip misalignment
You think it’s a rare case? Nope! In summer 2012 I got a new Atik 460 EXM with really misaligned CCD chip. How I did I find that? I have some really perfectly collimated optics (setups) so unlike of 99% … Celý příspěvek
First „Light“ of Gemini G53F Mount
OK, it won’t be actually the first light, but a brief report from a third night (third use case) when I finally managed to handle the setup (cables etc.) and master polar alignment of this new friction drive mount made … Celý příspěvek
Rubriky: Articles in ENGLISH, Technika, recenze
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CCD Sensor QE (Quantum Efficiency) Comparison
QE is the ability of a detector to turn incoming photons into useful output. It’s computed as detected photons divided by incoming photons. In other words, a CCD sensor/detector with say 70% of QE detects 7 out of 10 incoming … Celý příspěvek
Rubriky: Articles in ENGLISH, Technika, recenze
1 komentář
Astronomical Image Posterization Example
A long time ago I made an example of posterization in an astronomical image, but due to my busyness I was unable to share it with you sooner. This example image was done with an OSC CCD camera (but it’s … Celý příspěvek
Rubriky: Articles in ENGLISH
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Borg – resistance futile
Really? Really. Since 2008 when I purchased my first (ever) refracting telescope intended for astrophotography (Borg 77 EDII @ F/4.3) I have collected many Borg items purchased from Astro Hutech (Ted Ishikawa was always very helpful). Namely, after Borg 77 … Celý příspěvek
QHY10 – an afterparty „review“
OK, it’s not going to be a real review, but just a bunch of user comments after using this camera for a while. First, I’d like to state the reasons why did I purchase it? I wanted a camera that … Celý příspěvek
Rubriky: Articles in ENGLISH, Technika, recenze
3 komentáře
IDAS LPS-P2, LPS-V4, Astrodon Sloan z’, Baader UV/IR Block
Seeing is believing. I like to check and measure myself various characteristics and parameters of new items that I have just purchased. The purpose is to show how good or bad the product is in order to make it easier … Celý příspěvek
Noise Tests of Kodak KAI-11002ME in Moravian G3-11000 CCD
Initially, I wanted to measure dark current of KAI-11002ME, because everybody says how high it is (yes, from the CCD specification it’s really huge), but has anyone really “seen it”? Me not. I have seen – measured – couple of … Celý příspěvek