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09-05-2014, 07:15 AM   #1
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Rear 1.4x Converters and 200mm lens

Hi

quick question. I am a landscape shooter and would like a 300mm F5.6 - rarer than hens teeth at the moment on the used market. The F4 versions are plentiful but heavy. I have a 200mm F4 FA, is there any substantial degrading of the image if I was to add a 1.4x rear converter baring in mind that I am generally loitering around the F11+ end? This would get me to 280mm F5.6 and one less lens in the bag!

Thanks for your thoughts


Last edited by gha128; 09-05-2014 at 07:16 AM. Reason: Typo
09-05-2014, 10:39 AM   #2
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Lens + tc combinations are always a bit "suck and see". IQ depends first on the quality of the lens.1.4 x tc's are better than 2x tc's, introducing less aberrations and holding up sharpness well generally.
Do you need AF? The adaptall 300 f5.6's are quite decent, and would cost less than a good 1.4x AF tc.
09-05-2014, 10:44 AM   #3
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You might want to have a look at my post of TC performance with some sharp glass. Link https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/267012-some...nce-tests.html

My observation was that the IQ degrade is limited if the lens quality is very good. The TC seems to just amplify the lens imperfections. I assume there are also different quality TC models, so selecting a good one might be important.

For landscape you would have all the time to overcome the main issue I had with the Pentax 1.4x-S converter, namely manual focus...! I tend to chase birds and wildlife where the newer HD DA-1.4x AF AW which I bought mostly works well. Sometimes hunts on f/4 lens though.

BTW are you referring to FA*200 f/4 macro. That is premium glass, so Pentax 1.4x-S rear converter or new DA-1.4x should work a treat.

PS: if you are interested in a Pentax A-1.4xS rear converter, you might want to contact forum user @georgecape. I carried his one to the UK about 8 weeks ago for him in anticipation of marketing and selling there. Not sure if he has sold it yet.

Last edited by KevinR; 09-05-2014 at 10:56 AM.
09-05-2014, 10:53 AM - 1 Like   #4
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The macro for 645 is 120mm. The 200f/4 is a normal telephoto lens. I have the manual focus one which is sharp and very light. The 645 TCs automatically make the lens manual focus whether FA or DA or DFA

I have the 2 x TC and it is generally horrid. Makes the lenses pretty soft. I bought it used so could just be a bad copy

09-05-2014, 11:10 AM   #5
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You have this lens??? SMC Pentax-FA* 200mm F4 Macro ED [IF] Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database
You mean the one that's rated 10 out of 10 for sharpness?

Put a Pentax HD DA 1.4x AW AF Rear Converter on it and you will be soooooo laughing. Don't even waste your time on cheaper ones for a lens like that. With that TC, you won't have a degraded image....I can't speak for any others.

---------- Post added 09-05-14 at 02:24 PM ----------

Oh MF, I'll just shut up now....

Last edited by normhead; 09-05-2014 at 11:19 AM.
09-05-2014, 01:06 PM - 1 Like   #6
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Just realized MF. I'll climb back in my box now...
09-06-2014, 05:01 AM   #7
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Hi

Thanks for the responses so far. Yes it's the 645 FA 200mm f4 that I have. Not the 35mm macro.

I concur that the 2x would be a no go .

Has anyone used the combination of 1.4x?

I would buy a used 300 f5.6 if I could find one of reasonable price...the f4 versions are substantially cheaper. I guess because of their heavier weight and consequently less desirable

---------- Post added 06-09-14 at 01:02 PM ----------

QuoteOriginally posted by marcusBMG Quote
Lens + tc combinations are always a bit "suck and see". IQ depends first on the quality of the lens.1.4 x tc's are better than 2x tc's, introducing less aberrations and holding up sharpness well generally.
Do you need AF? The adaptall 300 f5.6's are quite decent, and would cost less than a good 1.4x AF tc.
Hi what do you mean by adaptall 300 f5.6?
09-14-2014, 04:00 AM   #8
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QuoteOriginally posted by gha128 Quote
Hi

Thanks for the responses so far. Yes it's the 645 FA 200mm f4 that I have. Not the 35mm macro.

I concur that the 2x would be a no go .

Has anyone used the combination of 1.4x?

I would buy a used 300 f5.6 if I could find one of reasonable price...the f4 versions are substantially cheaper. I guess because of their heavier weight and consequently less desirable

---------- Post added 06-09-14 at 01:02 PM ----------



Hi what do you mean by adaptall 300 f5.6?
I have to wade in on this discussion, I have both the 200mm-a and the 200mm-fa. both are top iq lenses. I have used the with both the 1.4 and 2.0 tc's. both combos have given me " tack sharp " images. when I use these combos in am shooting from either a tripod or a monopod. in the end you have to try them yourself using the best skill you have to really know. oh and you will be shooting in manual focus mode.. I also use a 67 300mm lens with an adapter, a really sharp lens but heavy as hell.

09-15-2014, 02:20 AM   #9
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Thank you for that - I will give a 1.4 a go
09-19-2014, 01:25 PM   #10
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I have the 645 A 200/4 and 300*/4. And the 1.4x and 2.0 converter. All on the 645D.


The 1.4x converter was designe dfor the 300*. Strange enough, it doesn't work that well with the 300*. The gain compared to just cropping from a 300mm Image is really small, hard to detect. Ist it because of the 300* is bad? No, the 300* work very well with the 2x converter.


On the 200/4, the 1.4x work very well! Off course you Need to stop down a bit.. 1 Stop for very good results, two for optimal results. But that's not new when using converters.


I use the 1.4x converter in my small set. 45-85, 120, 200, 1.4x.
In the big set, I use 35, 55, 75, 150 and the 300*, with the 2x converter (used with the 55 SDM and the 300*).
09-20-2014, 12:24 PM   #11
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I have used tc's on all my cameras with a lot of good results. I am posting some from my 200mm and 400mm with my 2x tc.
1-3 200mm+2x tc
4 200mm+2x+2x tc
5-7 400mm + 2x tc.
ooops, sorry the last three were from my sony a-850. got them mixed up.
Attached Images
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PENTAX 645D  Photo 
View Picture EXIF
PENTAX 645D  Photo 
View Picture EXIF
PENTAX 645D  Photo 
View Picture EXIF
DSLR-A850  Photo 
View Picture EXIF
DSLR-A850  Photo 
View Picture EXIF
DSLR-A850  Photo 
View Picture EXIF
DSLR-A850  Photo 

Last edited by bull drinkwater; 09-20-2014 at 01:25 PM. Reason: more info.
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