Originally posted by geo444 Hi all Pentax Q's AstroPhotographers ! ...
Another way to resolve the AF unreachable infinity, would be to reduce the Flange distance...
Originally posted by geo444 Sorry... was mainly interested by AstroPhotography with my 200/1000 SkyWatcher !
I own the Pentax-Q 5-15 zoom lens, so if I find some idea, I'll post here...
.
Good news when you'll have removed your Q's IR-cut, 2old4toys !
I retrieved the measurements of the Q10 IR-cut Filter
12.6 width x 13.1 height x 0.6mm Thick
Its Thickness being 0.6mm only, you just need to Reduce BF 0.2 Maximum
-> an Optical-Rule useful when you insert / remove a Glass-Filter from a BF Path !
0.2 Maximum, because of Tolerance, if your Q has 0.05 of it...
then you just need to Reduce BF
0.15mm off
In fact, it's Very Easy : from 2 to 3 hours of High Precision Hand Work :
- Remove the 6 Screws... then the Bayonet
- verify that you find the Same Measurements as mine
... if Not, Write your Own Measurements then Subtract
0.2 &
0.1mm from them !
- for this, you need a
Vernier Caliper
- a friend of yours owns a Metal Lathe, you just have to remove 0.15 mm from
the Front-side of the Bayonet Front-side... then let's try it...
- else, you need a 10-11mm thickness
Three Square smooth Hand File
the 6+3 holes are in the External Crown of the Bayonet Back-side = 2.3 thickness
it'll be reduced to
2.2 all around at the same time than
3 of the following Sectors :
turning clockwise,
the Internal Bayonet Backside is divided into
6 Sectors starting at " InD33 " mark
-1 from ~1:0 to 2:30 AM (hole #2 position) : 2.4 thickness Sector to reduce to
2.2
(2 from 2:30 to 4:30 AM = 2.7mm Thickness sector : left as is)
-3 from 4:30 to 6:30 AM (hole #4 position) : 2.4 thickness Sector to reduce to
2.2
(4 from 6:30 to 8:30 AM = 2.7mm Thickness sector : left as is)
-5 from 8:30 to 10:0 AM (hole #6 position) : 2.4 thickness Sector to reduce to
2.2
(6 from 10:0 to ~1:0 PM = 2.7mm Thickness sector : left as is
)
Q10's Bayonet Mount backside :
Backside of the Bayonet : External Crown (6+3 holes) was 2.3 thickness
+
3 internal thinner Sectors were 2.4 thickness : now all are
2.2mm
I didn't touch the 3 other Sectors, they still are 2.7 thickness
-> 1st Sector begins at " InD33 " mark
I hope the grazing light shows all the details :
don't reduce the 2.7mm Sectors
Thinned Q10's Bayonet Mount, -0.2 & -0.1 this side, -0.1mm Max the other side :
Once you've reached
2.2mm thickness in these 3 Sectors - initially at 2.4mm
and, at the same time all around the External Crown (6+3 holes) initially at 2.3mm
you'll have to thin the Frontside of the Bayonet of
0.05mm to get started
then carefully Clean the Bayonet and remount it with its 6 screws
don't tighten too much, the screws are screwed into plastic
put the 5-15mm Zoom-lens, is your AF working ?
Do you hear the AF-confirmation 'BIP' ?
No, you'll have to go for 2.1...
Note : the 9-15mm range works first, the 5-9mm range works w/ a thinner Mount !
My Q10 is fine at
2.15 thickness, I'll confirm this when summer temp at 35°C+...
if your Own Measurements minus 0.15 gives you 2.15... go for 2.15 !
Now, you're able to Avoid the R72 Filter, thus the Tripod + High ISO setting !
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