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04-17-2014, 02:32 PM - 1 Like   #1
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Pentax 110 50mm on the Q

I think we will see a lot more people using this lens on the Q as they master the art of applying a diaphragm to stop it down. The New Zealand native Robin is about the size of a sparrow and lives in deep gloomy forest. The good thing is it is inquisitive and can't resist checking you out. Spot the shutter speed (1/10sec!!) . Don't let anyone tell you SR on the Q doesn't work!! The system rocks.
This was taken with the lens stopped down to about f4

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04-17-2014, 03:27 PM   #2
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Nice shot and thanks for posting.

I have asked the moderators to make the lenses on the Q index a sticky to keep it at the top of the page
05-09-2014, 10:50 AM   #3
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QuoteOriginally posted by GUB Quote
This was taken with the lens stopped down to about f4
How did you do it? I bought lens baby aperture disks to put inside the Q to 110 adapter for an 110 18mm lens I found on the cheap. Unfortunately the results from that lens have been underwhelming.
05-09-2014, 10:56 AM   #4
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QuoteOriginally posted by littledrawe Quote
How did you do it? I bought lens baby aperture disks to put inside the Q to 110 adapter for an 110 18mm lens I found on the cheap. Unfortunately the results from that lens have been underwhelming.
18/2.8 or the 18 pan focus? I imagine the pan focus is probably not the greatest lens, but it is kinda rare -- you could make some money selling it if you got it cheap. I've got the 50 and the 70 and they are both quite sharp on the Q...

05-09-2014, 11:20 AM   #5
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QuoteOriginally posted by vonBaloney Quote
18/2.8
This is the one. I've been trying to think if there is something I'm doing wrong but maybe it just isn't a great lens but I can't ask for too much from something that fell within the bound of the hamburger rule.
05-09-2014, 12:56 PM   #6
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Hmmm...I've heard good things about the 18/2.8 just like the rest of them, and searching for samples they look fine. They all seem quite well-made. I wasn't much interested in the 18 only because it is pretty close to what is already covered by the native Q lenses. What disc have you put into it? (I think you have to use the f/8 disc or smaller to have any effect -- I forget.)
05-09-2014, 02:13 PM   #7
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QuoteOriginally posted by littledrawe Quote
How did you do it? I bought lens baby aperture disks to put inside the Q to 110 adapter for an 110 18mm lens I found on the cheap. Unfortunately the results from that lens have been underwhelming.
For f4 you need a 6mm diameter aperture. I am using a ringbinder reinforcing ring with both sides felttip black except for about 1mm of the sticky side. This then sticks onto the back lens surround.
https://www.pentaxforums.com/forums/136-pentax-q/256849-comparing-adapted-lenses-q-4.html
The rear lens is about 9mm diameter. So if that is f2.8 then f4 will be just over 6mm , f5.6 will be the square root of 20 => 4.5mm and f8 the square root of 10 => 3.2mm.
(So long as it is close to the back of the len)
That is the theory anyway
A lot of people are using lensbaby rings but they are not true to label . From memory the f11 one did about f5.6 on the Q. If you use these make sure you get them as close to the lens as possible.

---------- Post added 05-10-14 at 09:23 AM ----------

QuoteOriginally posted by littledrawe Quote
I bought lens baby aperture disks to put inside the Q to 110 adapter for an 110 18mm lens I found on the cheap. Unfortunately the results from that lens have been underwhelming.
Check that the focus thread grease has not migrated to the internal glass. They have a relatively simple construction so this can happen easily (and is easily cleaned).
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