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Forum: Pentax Q 08-22-2014, 05:44 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
That's too extreme of a macro, what would you use it for? And did you ruin the lens? or are you just playing around?


Jacob
Forum: Pentax Q 08-22-2014, 10:07 AM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Hi Rendition, I'm just curious about how many lenses you have that can be mounted on the Q? Including all the ones you have converted and adapted?
For example I have 19 lenses that I can use on the Q, mostly K mount and 110 lenses. How many do you have? Surely your total is much higher.

Jacob
Forum: Pentax Q 08-12-2014, 08:15 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Looks like a nice lens. I will take one.
Actually I have been on the lookout for that one. Thanks for the info.

Jacob
Forum: Pentax Q 08-06-2014, 09:19 AM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Rendition, you should start your own company, binging all these lenses back to life. Not only for the Q but but also for Nikon 1, and some Micro four thirds. That way you not only have fun but also make some $$$$.;)

I could be one of your first customers.:)
Jacob
Forum: Pentax Q 08-04-2014, 01:16 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Thank you for the information rendition. I saw the photo in your post #775. Retaining all three front lenses and rotate them for the rear element is very interesting. But does that really work on the Q? Can you mount the assembly securely and rotate the lenses without getting things in the way?
Excellent work.
Jacob
Forum: Pentax Q 08-03-2014, 07:08 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Thanks for your reply rendition, for some reason I get "This content is currently unavailable" when I click on your Facebook link. I was wondering if the lenses would work individually by themselves (with an adapter of-course), I don't think I would be interested in those lenses if a separate rear element is required.

Thanks again.
Jacob
Forum: Pentax Q 08-01-2014, 07:06 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Hi, before I buy this Keystone 8mm camera, can someone please tell me if the lenses on it are adaptable to the Q? I see that Rendition post #775 had these lenses or similar on his Q, but I need to remove them individually from the mount. Are they easy to remove? Are they fixed focus? Is this the "D" mount? Thanks in advance.


Jacob
Forum: Pentax Q 06-26-2014, 05:45 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
F1.4 and 35mm FOV? Wow! Can you change the aperture setting or are you stuck with f1.4?
Anyhow it looks sharp. This is a very nice lens and it looks good on the Q.

Jacob
Forum: Pentax Q 06-16-2014, 07:28 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Yes, but you buy one washer and that's it, set it and forget it.;)
Good point about the thickness of the iris, I tried your suggestion by buckling it away from the lens, I really didn't notice any difference in the test shots. Maybe some matt paint will help.
Thank you for your suggestions, and thanks again for your posts, after all, you gave me this idea.

Regards
Jacob
Forum: Pentax Q 06-14-2014, 03:17 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
I shot these through the window, Pentax 110 f2.8 70mm lens at f5.6 using rubber washer (post 761) inside the 110 to Q adapter.
Forum: Pentax Q 06-12-2014, 09:20 AM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Yes I agree, very good that you've noticed and I'm glad you've mention it.
Just to show it will work the way it is, but you are right, with darker black matt paint to the washer I believe the image quality will improve even more.

Thanks for your comment
Jacob
Forum: Pentax Q 06-11-2014, 11:33 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
To see any improvement when using the rubber washer on the 110 lenses, I took some test shots and most of my four lenses were tested showed considerable improvement in image quality. It seems to me that the wider the lens the greater the improvement.
Here is a sample of a test shot using the 18mm lens, the upper photo is using the bare 18mm lens at f2.8.
the lower is with the rubber washer I'm guessing is at f5.6. Both photos are a crop from a shot taken at a great distance with the same focus point.

Jacob
Forum: Pentax Q 06-11-2014, 11:41 AM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Hi GUB,
Your posting about using the ring binder reinforcing rings on 110 lenses (post 661) was great and is an excellent idea. That inspired me to think of another way that might be easier to stop the 110 lenses. And that is by using a black rubber washer with centered hole, inserted in the 110 adapter.

If you or who ever is interested in this method of stopping down the 110 lenses. Get yourself a thin black rubber washer with smooth surface, approximately the same diameter size of the adapter. You can purchase these washers from any hardware store for about .50 to .70 cents. They are already black and with the hole centered. The hole in the washer is even smaller than the ring binder reinforcing rings, I'm guessing the f stop equivalent around f5.6 or so.
Before use I would wash it with soap and water to get rid of factory chemicals and other residue.

I don't know what kind 110 adapter you have, mine is by generic, there is a ridge inside my adapter where you can insert the washer and let sit against it. If yours don't have it I think it will still work.

My washer is a bit oversized. I like it that way, so I kind squeeze it into the adapter. I push the center of the washer with my index finger from the rear of adapter until it hits the ridge then push a little more to get the curve shape I want, so the hole in the washer almost touches the rear element of the lens. The washer can stay there permanently if you want, and It's easy to remove with a reverse push of your finger. I leave mine inside most all the time, that way when I change lenses, they're already stopped down.
I hope this works for you as it worked for me.
Jacob
Forum: Pentax Q 06-09-2014, 03:48 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
I think you are right about the rear element, rendition. I did not think about that.
It explains why I can't find the focal length or focus point on this lens. I tried to mount it on the Q with varied distances from the sensor and I can't get anything but a complete blur.
I was puzzled looking through this lens, normally I thought the image should look upside down, but not this lens, the image is right side up. And you can see clearly like looking through glass. So I was suspecting something wrong, but what do I know. I'm still learning.
Thanks for your quick response rendition, I learned something, and I appreciate it.

Jacob
Forum: Pentax Q 06-09-2014, 02:33 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Pardon my ignorance, but can somebody please tell me what lens or what mount this is? Would it work on the Q? I can't seem to figure out the focus point either.
I got this lens from a thrift store for about $5 and I think I wasted the money. What do you think? Please help, and thanks in advance.


Jacob
Forum: Pentax Q 06-08-2014, 10:52 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Hey rendition, where do you get all these lenses?
cool stuff. Lots of lenses lots of fun.

JR
Forum: Pentax Q 05-29-2014, 09:07 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Oh yes the flange distance is crucial, and thanks for the Wikipedia link. Great info.

I did some measuring on this 32mm Carl Zeiss lens. The flange focal distance is about 17 to 18mm.
According to Wikipedia it might work on C mount Bell & Howell. If the diameter and thread match.

But then the focus point will be about 2.5 feet away, not a real macro, and with no focusing ring is kind useless. You need more space from lens to sensor, and like I said it's best to use K to Q mount. It will work beautifully.

Jacob
Forum: Pentax Q 05-28-2014, 11:35 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Well I don't know the mount of my lens. It's a 32mm Carl Zeiss lens that was in either 3M or ABDick/scott Microfiche or Record Processing machine. I can't recall for sure. Most of the machines were scrapped and probably long gone. But the lens could have been used in many other applications so good luck finding this type of the lens.

The lens diameter is 2 centimeters (.78"). The rear of the lens is threaded and it comes with ring type nut that screws into the end of the lens.

Since I don't have any of the (C) or (D) mounts I can't tell you if this lens can be mounted on them. What is the diameter of these mount? I like to know myself.

Best use is on Pentax DSLR camera body cap. The body cap can also be used on the K mount adapter to the Q.
All you have do is drill a hole 2 centimeters in diameter in the body cap, insert the lens from one end and screw-in the ring nut from the back of the lens.
It won't work directly on the Q because the sensor is very close to the lens mount, It will definitely touch. and considering the focal length you will need at least 1.25 of an inch clearance from the sensor.

If you're using 110 to Q adapter, you have to find a cap or something that fits the adapter, or have one made. I found a cap that goes on Walgreen pills container. The cap is shaped like a hat so it had depth for the lens mount and it fits the 110 adapter. It works but not very secure. So I'm always looking.

I'm sorry if the explanation is not clear, English is not even my second but third language. I will gladly answer any questions.. But it's easy because if I can do it, anybody can.

Jacob
Forum: Pentax Q 05-23-2014, 10:45 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
It's just a weed, but Carl Zeiss and Q10 can make it look pretty.
Forum: Pentax Q 05-22-2014, 10:40 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Made of metal. It has aperture control, but no focusing ring. Sorry about the poor lighting.
Forum: Pentax Q 05-21-2014, 11:18 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Oh I love this lens, to me is priceless. the colors are deeper and the bokeh is just beautiful. But I would think this lens is very rare, it was designed specifically for old industrial microfiche machines in the 1980's.
When computer archiving arrived they junked the machines. And when I saw Carl Zeiss written on the lens I just had to remove it from the machine.
So I don't know what kind mount it is. The lens is small (about the size of 110 24mm lens). I'ts a screw mount with a ring nut at the end ot it. It can be used on K mount or any SLR mount. I just drill a hole on the body cap for the lens and tighten the nut. For the Q I found a bottle cap that fits the 110 adapter and drill the hole in the cap.

Jacob
Forum: Pentax Q 05-21-2014, 07:41 PM  
Sticky: Adapted lenses tested on the Q : the reference thread
Posted By jacobsr
Replies: 1,139
Views: 553,203
Carl Zeiss 32mm lens I removed from a scrapped microfiche machine, adapted to the Q. Macro only.


Jacob
Forum: Pentax Q 10-19-2011, 11:31 PM  
Long Pentax Q Review on YouTube
Posted By jacobsr
Replies: 9
Views: 2,218
Wow, thats the longest review I ever watched. I had to take a coffe break, Lunch break and do some streching :lol:
I don't know how you do it. You must be a hard worker and passionate. I would think that someone have to be extremly interested in this camera (like me) to sit through the whole thing. Great job though, I think your review is the best. I learn much more about the camera from your review than any other. Thank you.

J
Forum: Pentax DSLR Discussion 06-02-2009, 12:08 AM  
Poll: K-7 SR Activation Switch Absence Poll
Posted By jacobsr
Replies: 56
Views: 7,156
I feel that if SR stays on most of the time why have a button. I prefer to have less buttons since they need wires and circuitry and that adds more wheight and complexity to the camera.

I know somone on the other forum posted that he broke the SR button on the "off" position and now has no shake reduction.

To me the less buttons the better. Makes the camera simpler so I can constrate on photography, just setup and shoot away.


Jacob
Forum: Pentax Film SLR Discussion 04-06-2009, 12:55 PM  
NEW Spotmatic?
Posted By jacobsr
Replies: 35
Views: 6,027
[QUOTE=séamuis;538320]because the seller doesn't want to degrade the 'mint' status that's why. in what photo does the lens not look mint? I think you are seeing the scuffs and scratches in the plastic wrap with the strong lighting from the flash. im sure if you ask, the seller will give you the cameras serial number. nothing looks fishy to me.




Fourty three years sealed in plastic? I don't know but that looks fishy to me.

If this is a brand new camera I don't know if it will work. since it's never been
used in 43 years , some mechanical parts could be jammed or something.
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