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04-20-2020, 07:08 AM   #16
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QuoteOriginally posted by swanlefitte Quote
The plm works with the newest 1.4x tc. In post #9 I posted a picture from the combo.
I believe you, but still Ricoh does not mention the PLM as being compatible. Only the SMC and the HD 4-5.8 ED are on the list. I guess that from the PLM the diaphragm will not work with the rear converter. And I can find only one 1.4x converter. So it will probably work with (some?) limitations if you put the two together.

04-20-2020, 04:36 PM - 1 Like   #17
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"I need some advice on long telephoto for my Pentax system. I plan on buying the 1.4x teleconverter (the new one) and some telephoto for it."

I have tested my 55-300 PLM with and without the 1.4x teleconverter on a K-70 and cannot detect any increase in resolution in distant targets including smaller text on oil tanks 2 km away at 300mm. Images are smaller FOV, of course, but contain no perceptible additional detail. That is with now 2 55-300s (dropped one that bounced and rolled down a slope splitting into two parts. VERY sad.) so I don't think it's an individual lens issue.

That is not to say I am not very satisfied with the 55-300PLM. I am. It is one of my two most used lenses along with the 16-85mm. It's just that the teleconverter does not really add value for these two zooms.

Re. "will it work" questions...the combo certainly works on my K-70 and did on my previous K-50.

Last edited by jgnfld; 04-20-2020 at 05:36 PM.
04-21-2020, 05:34 AM   #18
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Thanks for the responses!
Based on the answers I ditched the idea to get the 55-300 PLM and the teleconverter.
DA 300mm is quite expensive, I have to think about it for a while.

So now I'm wondering about using the 1.4x teleconverter with the Tamron 70-200 f2.8, has anyone tried this?
04-21-2020, 10:23 AM   #19
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QuoteOriginally posted by jgnfld Quote
I have tested my 55-300 PLM with and without the 1.4x teleconverter on a K-70 and cannot detect any increase in resolution in distant targets including smaller text on oil tanks 2 km away at 300mm. Images are smaller FOV, of course, but contain no perceptible additional detail. That is with now 2 55-300s (dropped one that bounced and rolled down a slope splitting into two parts. VERY sad.) so I don't think it's an individual lens issue.
Understanding folks saying a TC doesn't ad more detail. - PentaxForums.com
Sorry the images are gone, thanks Photobucket. Hopefully you get the gist without the photos.

My method was find something with print in various sizes. Back the tripod out until the the lens in question can no longer resolve the small print. From the same spot, put the TC on and see if the TC resolves what the lens alone couldn't. I'm guessing you'll be surprised. If there is one thing people need to understand , its' that not all the resolution available from the lens is needed for every images. IN fact, what I've found is, in many images you get pretty much the same images from 16 MP and 36 MP sensors. But every now and then an image comes along that can actually use the extra resolution.

For the most part, my guess is higher resolution is optimal at most 5% of my shooting. YMMV.

I really have to go find those pictures and repost them.

To my mind, the worst assumption commonly made by people on the forum is that better lenses get you better image in every circumstance. It leads to a lot of heartbreak when people break the bank for an expensive piece of glass, and it doesn't change their photography much.

AN update of the TC post..
My first series of images went as follows... taken at about 40 feet, with not a lot of detail in the test subject.
DA*200


DA*200 plus 1.4


DA*200 plus 1.7


DA*200 by itself enlarged to the same size as the DA*200 2.8 plus 1.7x AF Adapter


Both TC's are clearly better than the DA*200 image on it's own.


Last edited by normhead; 04-21-2020 at 12:04 PM.
04-23-2020, 09:38 AM   #20
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QuoteOriginally posted by maciekpruski Quote
So now I'm wondering about using the 1.4x teleconverter with the Tamron 70-200 f2.8, has anyone tried this?
Is the Tamron that strong at the long end? If not a teleconverter won't help much.

What is your budget?

If wildlife shooting is important and you need 300mm+ for it then the DA*300 is what you want. It is sharp wide-open at f4 and with the TC it is sharp wide open at f5.6.

The 55-300 PLM can get good results (perhaps good enough?), but only if the light is good and focus is nailed. But it is not in the same league as the DA*300 at 300mm.
04-23-2020, 07:15 PM   #21
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QuoteOriginally posted by maciekpruski Quote
So now I'm wondering about using the 1.4x teleconverter with the Tamron 70-200 f2.8, has anyone tried this?
It seems that the Tamron works OK with TC's, which is not common with other 70-200's. But there is still some resolution loss.
Tamron SP AF 70-200 mm f/2.8 Di LD (IF) MACRO review - Image resolution - LensTip.com
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