Prev. Page             Main Page             Page Bottom             Next Page

Pentax K2Q adapter and 1"25 filters

Pentax Q, Q-10 for Astro-photography

How could this small CostLess digicam's tiny sensor be so Sensitive ?
Pentax Q, Q10 1/2.3" BSI vs Bigger-Cameras, then vs Astro-Cameras

Clic Image, Ctrl+ to enlarge more

From the Sony imx183 (Samsung NX mini) up to the imx078 (PentaxQ, Q10)
both Dima and Sony Calculation methods show a ~43% increase in Sensitivity,
a ~43% increase in Sensitivity is like opening Aperture from f/5 up to ~f/4.2 !
For Q, Q10 Sony Calculations : 3574 and 3354 are averaged to 3464 value.
~> Sensor's main page for Fully Detailed informations : SensorCompare.html
One can see that it's Not its Big Pixels that make the Sensitivity of a Sensor !
It's rather the Precision of 1st the Lithography process 2nd the Etching process,
down to 90nm for its brother imx118, that let Sony maximising their Fill-Factor.

~> Pentax Q7 Full Review :
~> Pentax Q Review :
PhotographyBlog :

~> Sony imx078cqk BSI Exmor Sensor Specification Sheets to DownLoad :
DownLoad the 2 Sony Specs Pages with *Digit Value zipped to
25 years ago, you'd have to be a Fortunate Professional Researcher to get a
BSI CCD sensor with High Energy Waste, and High Dark Current level, and No
possibility to get the Signal Cleaned, then Digitized "on chip" : The Exmor Bonus !
Right-Click, View-Image to enlarge these DSSO pics : Deep Sky Small Objects
Q10-DSSO x3  pentaxforums/forums/136pentax-Q/212387-Astro-Q-club-p10
Q10-DSSO x1  pentaxforums/forums/136pentax-Q/212387-Astro-Q-club-p11
Q10-DSSO x3  pentaxforums/forums/136pentax-Q/212387-Astro-Q-club-p12
Q10-DSSO x2  pentaxforums/forums/136pentax-Q/212387-Astro-Q-club-p13
At the end of that P.13, orio posted a nice Clownface-Eskimo-Nebula Ngc2392,
Honesty forces me to say that IR-Cut Removal is Not a plus for that Blue Nebula
Drawbacks of Pentax Q-Q10, despite its 1/2.3" Fabulous imx078 BSI sensor
~ Drawbacks in yellow could certainly be Fixed by a FirmWare Hack/Update
... Please read : PentaxQ10FWdisassembly.html
~ Bulb + Manual Mode limited to 30 sec. Exposure w/ Pentax K2Q Adapter
~ ISO 1600 => Amp-Glow at the Bottom-Left of the frame + random LENR
... 2-4 min. Long Exposures at ISO 800-400 to avoid Amp-Glow and LENR

... Please read : SamsungNXminiTopIR.html
~ No way to set the LENR, Long Exposure Noise Reduction, fully ON or OFF
~ Camera Temperature Not Recorded in EXIF Data for Exposure > ~10 sec.
~ IR Remote Control doesn't work with Bulb, nor Intervalometer
– Multi-Exposure Mode outputs a JPEG file, not a RAW file
– No Wired Remote Control Port on Pentax Q, Q10, Q7, Qs1
– IRcut removed, the Auto/Manual-Focus doesn't work w/ 5-15 mm zoom lens
... except for subjects at (very) Short Distances. Ditto to expect from 15-45 mm
Tiny Pixels are in Love with the Highest Precision from Belt-Driven-Eq-Mount
... I only own an Old Black HEQ5, thus being forced to Trash ~50% of my subs
One, 1 arc-second = 1/1 296 000 of a Circle... IOW 1/3 600 of 1 Degree...
1 degree is ~half your thumb's nail width, your arm held out to the sky...
you'll have to draw 7 200 parallel fine lines on your thumb's nail !
... That is, looking from your arm's full length... Good luck !
Bill Claff's Photo Dynamic Range ranking : Sony 1" BSI, Pentax Q10, Nikon 1"
... FSI, some older Classic APSc cameras, iphone7 :
PDR tiny BSI CMos sensors
Clic Image, Ctrl+ to enlarge more
More Advantages to the Pentax Q, Q10 over other 1/2.3" BSI cameras
– Q - Q10 are unique 1/2.3" BSI cam. to support Interchangeable Lenses.
– K-to-Q optional Adapters open the Q & Q10 to the whole K Lens System
– Q-Q10 have a 1000 mAh Battery, it lasts 1 summer night in precise conditions
– the Q-10 is a CostLess camera : I bought mine for €170 in spring 2014
– the IR-Cut filter inside the Q, Q10 is Easy to Remove (read next)

Fit a 1"1/4 Astro Filter in Pentax K2Q Adapter

1.25 inch, 31.75 mm is the standard small size for AstroPhotography Filters
and it perfectly fits inside the Pentax K-Lens to Q-Mount Adapter :

How to Hold a 1"25 Astro Filter inside the Pentax K to Q Adapter
– first, you need ~10 cm of Steel Piano Wire, diameter 1 mm
– bend it to get a ~29.5 mm external diameter Ring
– over-bend the 2 ends of the Ring to avoid tearing the felt
– place your clean Filter separated from its mount ring in the housing...
the housing surrounded by 6 screws at the bottom of the Pentax K2Q Adapter
– secure the Filter in the place with your HomeMade Ring taking care of the black felt
– that's it, you're now ready to use your Pentax Q or Q10 for AstroPhotography !
A standard 1"25 Baader SkyGlow Filter, removed from its mount ring
1"25 Filter Blocker
Pentax K2Q Adapter + M42 T2 Ring - a 29.5mm Wire-Ring keeps the Filter in place
Clic Image, F11 to enlarge

Note :
The Thickness of these Filters being 2 mm or more, a Pentax K Lens will focus to infinity
before its Infinity Mark is reached, even if you have removed the Q or Q10's IR-cut filter.
How much does a Filter shift the Infinity Focus Position ?
Bravo, you did it ! ;)
Hundreds of DS(S)O, Deep-Sky-(Small)-Objects, will be yours now...
IC-5146 Cocoon Nebula, perfect example, will remain invisible on your LCD
after 30 sec. at ISO 1600 w/o IR-cut : find its way among Surrounding Stars !
But, after 60 Exposures Stacked... and a Strong Push... You'll start to see it :
      ©Dima Lootvoet 2010-20

Prev. Page             Main Page             Top of Page             Next Page