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03-12-2014, 01:56 AM   #661
GUB
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Pentax 110 18mm f2.8 @ f4.5

I have found a very simple and cheap iris to effectively stop the 110 lens down to about f4.5. Get yourself a pack of adhesive ring binder reinforcing rings. The ones I got were plastic and cost a few dollars for 200! And then use a spirit marker to blacken them, paying attention blackening the edge of the aperture so that the sensor can see no white. They lightly stick to the plastic surround of the back element. The improvement in image quality is outstanding. I have made a comparison here between the 110 18mm, the 02 lens at 15mm and the DAL 18-55 at 18mm. In this image the shutter speed for the 110 was 1/1000 sec so I adjusted the 02 until it was at 1/1000. It was at f4.5. And so presumably was the 18-55.
I think the 110 seems to be the best and the 02 the worst . The first image is the subject image and the next 3 are 100% crops of it. The remaining images are 110 samples.
Taken on a Q at ISO125 and saved as jpegs.
The downsized images are pped in gimp but the 100% crops are from unedited images.
No lenshoods or filters and taken on tripod.

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03-12-2014, 09:30 AM   #662
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QuoteOriginally posted by GUB Quote
Pentax 110 18mm f2.8 @ f4.5 I have found a very simple and cheap iris to effectively stop the 110 lens down to about f4.5. Get yourself a pack of adhesive ring binder reinforcing rings. The ones I got were plastic and cost a few dollars for 200!
That looks great! (I hope to update the index this eve)
03-13-2014, 05:34 AM   #663
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Pentax 110 24mm f2.8 @f4

I have done the same here as the 18mm above. It appears that the ringbinder reinforcing ring doesn't stop this lens down quite as much. I am guessing it is about f4.
The full images are pped in gimp but the 100% crops are from ex camera images. I have also done a comparison with the DAL 18-55 with the fern. Looks like the 110 wins.
When I sort out some baffling within the adapter and perhaps add a uv-ir cut filter and of course a hood I think this lens have even more potential.
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03-13-2014, 11:47 AM   #664
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Hi GUB,

Very creative solution!!!!

I've been looking for an effective way to stop down my 110 lenses for a while -- and this looks like the best solution I've seen so far. . .Have to break out my 110 lenses and have a try -- they're so well suited to the Q's from a size standpoint.

Thanks!!!!!

Scott

03-13-2014, 06:15 PM   #665
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QuoteOriginally posted by snostorm Quote
Hi GUB,

Very creative solution!!!!

I've been looking for an effective way to stop down my 110 lenses for a while -- and this looks like the best solution I've seen so far. . .Have to break out my 110 lenses and have a try -- they're so well suited to the Q's from a size standpoint.

Thanks!!!!!

Scott
The 24mm is the size of my thumb- it looks undersized even on the Q. I think it may have enough coverage to cover the sensor on my K30 but won't it look nuts if I manage to adapt it on.
03-14-2014, 04:03 PM   #666
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Quantaray 28-70mm f/2.8-4

This looks pretty promising, though clearly it's gone past hand holding at 70mm This lens is similar to the 18-55 DSLR kit lens in size and bulk, but a bit faster so better suited to the Q. I will try to add a few tripod telephoto shots and more image-critical tests and repost here.




Update - shots turned out OK but not excellent with tripod and zoomed in to focus. Most were quite good for color and contrast, but the left one here was a bit washed out and purplish before some adjustments. The right-hand shot is ok on the flowers but the fence is pretty fringed. Both of these were stopped down a bit from max aperture. Guess I need to go back to primes!

Last edited by jimr-pdx; 03-14-2014 at 04:24 PM.
03-14-2014, 04:47 PM   #667
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Can you tell us a bit more on the lens? I tried to look it up on the Forum's 3rd party info - and found one rated 4.00... This is a Ritz Vivitar? Komine? Kiron? or what?
03-18-2014, 08:23 AM   #668
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Pentax SMC M 135 f3.5 on Q7

Shot with the Pentax OEM adapter and a SMC-M 135 f3.5 lens f8 seems to be the sweet spot. Shot on my Q7 all hand held. The 135 is about equal in IQ to my SMC-F 80-200 zoom. All processed in LR5 added some sharpness and a little contrast























Last edited by hnikesch; 03-19-2014 at 02:31 PM.
03-18-2014, 11:56 AM - 1 Like   #669
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Hey Hans, the lens looks sharp but seems to have a purple cast - the croc looks like Barney the dinosaur. Is that a WB or PP issue or maybe severe purple fringe?
03-18-2014, 01:31 PM   #670
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QuoteOriginally posted by crewl1 Quote
Hey Hans, the lens looks sharp but seems to have a purple cast - the croc looks like Barney the dinosaur. Is that a WB or PP issue or maybe severe purple fringe?
Barney the dinosaur, you're a genious!
03-18-2014, 05:39 PM   #671
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I didn't notice but you are correct. I tried to fix if but it's not WB or PP it was in the orig image. I think it's the blue sky deflecting. Ths croc should be brownish green. I looked at other images same croc, camera, day but from the side and they're the correct color. Go figure

Edit: I reprocessed the shot and reposted above still not great but

Last edited by hnikesch; 03-19-2014 at 02:32 PM.
03-19-2014, 03:55 PM   #672
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Looks better now Hans. Thanks for the help on the index, I think we are up to date for the moment.
03-20-2014, 01:33 PM   #673
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Pentax Tele-Takumar 1:5.6/200mm M42 preset

The tele-tak is a lovely piece of engineering and looks the part on the Q. I used it on another thread about CA thinking an old lens like this would glow like a rainbow but it is not too bad. It is modestly sharp but really requires a tripod to get the best out of it.I used a tripod here as well as a very tight fitting hood and also included a uv-ir cut filter. PPed in Gimp.
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03-20-2014, 02:20 PM   #674
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QuoteOriginally posted by GUB Quote
The tele-tak is a lovely piece of engineering and looks the part on the Q. I used it on another thread about CA thinking an old lens like this would glow like a rainbow but it is not too bad. It is modestly sharp but really requires a tripod to get the best out of it.I used a tripod here as well as a very tight fitting hood and also included a uv-ir cut filter. PPed in Gimp.
Really nice shots with the M42 PS 5.6/135.

Did you need to PP out any CA/PF? These look completely free of it. (Maybe a little PF in the background OOF of the dog shot?) The cut filter seems to be working well here. F-Stop? Able to use F5.6, or close up to F8?
03-20-2014, 02:39 PM   #675
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QuoteOriginally posted by cahudson42 Quote
Really nice shots with the M42 PS 5.6/135.

Did you need to PP out any CA/PF? These look completely free of it. (Maybe a little PF in the background OOF of the dog shot?) The cut filter seems to be working well here. F-Stop? Able to use F5.6, or close up to F8?
There wasn't much CA but then it was a light overcast day and the colours and contrasts are fairly muted. There is a little red along the lireodendron leaves. I used the colour curves in gimp to adjust contrast and sharpened a little. I also sucked a little blue out of the dog's black areas using the hue-saturation tool. But no CA work. ( I use the term CA because PF implies there is only one colour and we know the colour can come from both ends of the spectrum).
I am pleased enough with the uv-ir cut filter that I have set it inside my adapter setup behind the lens. This means all M42s utilize it no matter what their filter size.
The lens was wide open for these shots. It seems to stay sharp right out.

Last edited by GUB; 03-20-2014 at 03:07 PM.
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