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09-29-2012, 10:37 PM   #16
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Thanks for all the suggestions. I've got the list and will start my search.

Much appreciated.

10-01-2012, 11:00 PM   #17
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Thought I'd post an update since I know I hate it when I give advice and never hear back on the outcome.

I researched prices for the following lenses on eBay and some that happened to show up locally, so this is not very scientific:

Tamron SP Adaptall-2 180mm F/2.5 LD-IF Model 63B ($770)

Jupiter 37A (between $50-$80.00, all from overseas)

A 200 /4 ($270)

M 200/4 ($50-$200)

Voigtlaender Apo-Lanthar 180/4 -same as? -Voigtlander 180 f4 (ebay $900)

200 CZ (only see tele tessar $200-500)

Steinheil Auto-DTele-Quinar 2,8/135 mm German Lens (did not find)

Carl Zeiss Jena Sonnar 3,5/135 mm MC DDR Lens ($25 - 5 days to go ebay)

Carl Zeiss Jena Sonnar 2,5/200 mm MC Auto (did not find)

FUJINON EBC 1:3.5-135mm ($85, x mount?)

FUJINON EBC 1:2.5-135mm (did not find)

Some of these are real bargains, but others are rather expensive - I may just be looking in the wrong places.

The good news for me though is that I was able to correct an issue I was having with a Sigma 70-200 2.8 when put on the Q adapter, of showing a smoky image.
If interested in the details and a sample they are at https://www.pentaxforums.com/forums/pentax-q/173602-reach-q-images-5.html#post2120904

So the urgency is off, but I have a couple of bids in on some of these lenses to see if I can score a deal as the compactness is attractive.

Thanks again.

Oh, by the way if I am off on some of the pricing I found please send me a link to a better deal, but for now I probably don't want to spend more than 100 since my Sigma is functional.
10-02-2012, 09:38 AM   #18
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See, my suggestion (Pentax 165/2.8 for 6x7) was a relative bargain! But if you already have 70-200 at f2.8, possibly not worth the gamble.

The Carl Zeiss Jena stuff always sounded interesting to me when I was buying many lenses, but was difficult to find in the US.
10-03-2012, 05:22 AM   #19
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The Pentax Q has a very high pixel density. Therefore it requires modern lenses that are very well corrected of all forms of chromatic aberrations.

For example, the Tamron SP Adaptall-2 180/2.5 has been suggested in this thread. At the time of its launch, this was certainly a superb lens on a film camera. On a full frame digital camera with a low pixel count (like a 12Mpix Canon EOS D5), it is still able to deliver beautiful photographs today. On a modern DSLR with multimegapixel APS-C sensor (high pixel density), this lens is very prone to purple fringing and displays a hefty amount of longitudinal chromatic aberration. So, I guess the Tamron wouldn't fare too well on a Pentax Q. This is also the case with most vintage lenses, due to their lack of proper correction of aberrations.

I would rather look for a modern APO lens to mount on a Pentax Q, like a Cosina-Voigtländer Apo-Lanthar180/4 or a Sigma Apo Macro 150/2.8.

Cheers!

Abbazz


Last edited by Abbazz; 10-03-2012 at 05:28 AM.
10-03-2012, 07:48 AM   #20
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Great to hear that you resolved the problem with the Sigma 70-200.
Personally, I'd just stick with it, now that it seems to be working fine.


I totally agree with Abbazz's comments about older lenses.
What may appear ok on a 12mp Kx or 16mp K5 may not necessarily mean its 'ok' on the Q.
The K135 is a good example. Its totally fine on my K5, but CA is bad on the very high pixel density of the Q.

I'd recommend that you get any of the lenses you listed only if you also have an interest in the lens on your DSLR.
This way, if it does not work on the Q, at least you want it for your dslr anyway.
My few cents.
10-03-2012, 07:53 AM   #21
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Thanks for the advice and info Abbazz and Pinholecam.

Upon testing some of my older excellent primes like a50-1.7 I find truth in your words.
It's great on k-5 but a CA mess on the Q.
10-04-2012, 10:57 AM   #22
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I see nobody has mentioned the SMC Pentax K 200/2.5.

Gets very good reviews in the forum and remains the fastest 200mm lens Pentax ever made.

Tom G

Last edited by 8540tomg; 10-04-2012 at 01:14 PM.
10-04-2012, 11:03 AM   #23
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QuoteOriginally posted by 8540tomg Quote
I see nobody has mentioned the SMC Pentax K 200/2.5.

Gets very good reviews in the forum and remained the fastest 200mm lens Pentax ever made.

Tom G
Tom, perhaps a few goldfinches could persuade them

10-04-2012, 11:38 AM   #24
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QuoteOriginally posted by Lowell Goudge Quote
Tom, perhaps a few goldfinches could persuade them
Good idea Lowell.

I couldn't readily find any Goldfinch shots but manged a few rugby images. These were all shot with the Pentax K10. Results are even better with the K5.



This kid was a real load.



Crop of previous shot



Tom G
10-04-2012, 12:56 PM   #25
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nice shots tom. the only thing I can see, but you need to look for it, is some lateral CA in the out of focus area,(see the upper right corner and the white shoulder patch) but all lenses of that era produced it, so i don't consider it a serious flaw.
10-04-2012, 01:34 PM   #26
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QuoteOriginally posted by 8540tomg Quote
I see nobody has mentioned the SMC Pentax K 200/2.5.

Gets very good reviews in the forum and remains the fastest 200mm lens Pentax ever made.

Tom G
The 200/2.5 is a fine lens, but already tends to show obvious CA on a modest Kr or K20. So I guess it is much worse on a Q. I would also (as several others did) suggest the Voigtlander Apo Lanthar 180/4 - which is fantastic lens ans stunningly compact.

Ben
10-04-2012, 01:39 PM   #27
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Ben, I wouldn't bet the farm on the assumption that the CA is worse on a Q than a DSLR. The CA that is apparent in tom's photo is in the Out of Focus region, and off the center of the image. Tom's crop is not even cropped into the area of the Q so it is hard to imagine without trying it on a Q directly just how bad it or any legacy lens will actually behave.

it is along the same lines as the argument about using MF lenses (6 x 7 and 645) on a cropped sensor, you really are using the sweat spot of the lens
10-05-2012, 11:20 AM   #28
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No one metioned the takumar 200 f4. you can find one around 40-50. Not particulary fast , but I think is great, better than my jupiter and zeiss 135, or I have a stellar copy of it, either way you won't lose too much. I have a super takumar one. needs a hood that's all.
10-05-2012, 11:46 AM   #29
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QuoteOriginally posted by Lowell Goudge Quote
Ben, I wouldn't bet the farm on the assumption that the CA is worse on a Q than a DSLR. The CA that is apparent in tom's photo is in the Out of Focus region, and off the center of the image. Tom's crop is not even cropped into the area of the Q so it is hard to imagine without trying it on a Q directly just how bad it or any legacy lens will actually behave.

it is along the same lines as the argument about using MF lenses (6 x 7 and 645) on a cropped sensor, you really are using the sweat spot of the lens
Yes, Lowell, you could be quite right about the sweet spot effect. I don't know. I personally find the 200/2.5's CA quite obvious in many situations (typically hard edges like house corners, tree branches etc.) and the Apo Lanthar is simply free of any aberration worth mentioning. Nevertheless I love the K-monster more, for whatever reason... But reason dictates to prefer the Voigtlander.

Ben
10-05-2012, 11:58 AM   #30
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QuoteOriginally posted by Ben_Edict Quote
Yes, Lowell, you could be quite right about the sweet spot effect. I don't know. I personally find the 200/2.5's CA quite obvious in many situations (typically hard edges like house corners, tree branches etc.) and the Apo Lanthar is simply free of any aberration worth mentioning. Nevertheless I love the K-monster more, for whatever reason... But reason dictates to prefer the Voigtlander.

Ben
I would tend to agree with you on the CA. It is easy to spot when you know where to look. I have the K300/4 and it produces wonderful images but you need to make sure that there are no twigs etc, in the out of focus detail for exactly that reason.

I would need to look at CA and whether it manifests itself linearly or not as you move away from the center of the image. if it is linear, then the only reason you do not see it is just that we are not looking close enough, and enlarging it more (cropping in with the Q) will simply expose it but, if it is somewhat exponential as you move away from the middle, then the cropped shots should be better, time for a test I think.
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