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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

PntxQQ10vsOther
Clic Image, Ctrl+ to enlarge more

From the Sony imx183 (SamsNXmini) up to Sony imx078 (PentaxQ, Q10)
both Dima & Sony Calculation methods show a ~43% increase in Sensitivity,
a ~43% increase in Sensitivity is as 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 : https://www.dpreview.com/reviews/pentax-q7
~> Pentax Q Review : https://www.dcresource.com/reviews/pentax/q-review
https://www.imaging-resource.com/PRODS/PENTAXQ/PENTAXQA.HTM
www.ephotozine.com/article/pentax-q-compact-system-camera-review-17429
PhotographyBlog : www.photographyblog.com/reviews/pentax_q10_review

~> Sony imx078cqk BSI Exmor Sensor Specification Sheets to DownLoad :
DownLoad the 2 Sony Specs Pages with *Digit Value zipped to imx078cqk.zip
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/136-pentax-q/212387-Astro-Q-club-10
Q10-DSSO x1  pentaxforums./forums/136-pentax-q/212387-Astro-Q-club-11
Q10-DSSO x3  pentaxforums./forums/136-pentax-q/212387-Astro-Q-club-12
Q10-DSSO x2  pentaxforums./forums/136-pentax-q/212387-Astro-Q-club-13
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
– Bulb + Manual Mode limited to 30 sec. Exposure w/ Pentax K2Q Adapter
– ISO 1600(+) show slight Amp-Glow in the Bottom-Left corner of the frame
– Multi-Exposure Mode outputs a JPEG file, not a RAW
– IR Remote doesn't work w/ Bulb nor Intervalometer
– No Wired Remote Control Port on Pentax Q, Q10, Q7, Qs1
– No way to set the LENR totally ON or OFF
– 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...
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
pentaxforums.com/frms/136pentax-q/212387-astroQclub-13.html#post3274556
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 : http://photonstophotos.net
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)
https://www.dpreview.com/galleries/tags/pentax-q10

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 :
pentaxforums.com/reviews/pentax-k-mount-to-q-adapter/introduction
pentaxforums/lensreviews/pentax-adapter-q-for-k-mount-lens

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 ?
mecastronics.free.fr/PentaxQLandscapeIR.html
.
Bravo, you did it ! ;)
Hundreds of DS(S)O, Deep-Sky-(Small)-Objects, will be yours now...
https://www.dpreview.com/galleries/tags/pentax-q10
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 :
IC-5146 pentaxforums.com/forums/136-pentax-q/212387-Astro-Q-club-12
      ©Dima Lootvoet 2010-20

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