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02-20-2018, 07:43 PM   #1
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Which lens would you buy for those with AFA 1.7x? DA 300mm or 300* M

I got the lens buying bug, and it unsurprisingly coincides with tax season

For those who have used the AFA 1.7x, which one do you think is a better buy per price/performance, or just performance in general; the DA 300mm for $896 or a good copy of pentax-M * 300mm f4 for $440? There was also a FA available for $711, but that seemed so close to the DA price and the DA has warranty and weather sealing, unless FA owners out there say the FA 300 f4.5 is stardust magic. I like to hike, but don't have a lot of bird photos, but I figure I will start focusing on birding if I pull the trigger on one of them.

Please help me with your input, Thanks!

02-20-2018, 07:45 PM   #2
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I use this TC with my DA*300/4 ... works just fine, actually better than with the (new) HD 1.4X TC.
02-20-2018, 07:56 PM - 1 Like   #3
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The FA 300 f4.5 is a smaller lighter lens than the DA*300mm. It can be used handheld quite well, and this why I chose it ahead of the DA*.

My 5 cents.
02-20-2018, 08:23 PM   #4
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QuoteOriginally posted by jpzk Quote
I use this TC with my DA*300/4 ... works just fine, actually better than with the (new) HD 1.4X TC.
QuoteOriginally posted by hcc Quote
The FA 300 f4.5 is a smaller lighter lens than the DA*300mm. It can be used handheld quite well, and this why I chose it ahead of the DA*.

My 5 cents.
The DA*300/4 is quite easy to be used hand-held ... my humble opinion.

02-20-2018, 08:34 PM   #5
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QuoteOriginally posted by hcc Quote
The FA 300 f4.5 is a smaller lighter lens than the DA*300mm. It can be used handheld quite well, and this why I chose it ahead of the DA*.

My 5 cents.
My FA* was too good of a deal to pass on. I have compared to DA* 300. Not a huge difference. Both are excellent, the FA* is lighter, the F* is lighter still.

That said, I mostly use the 1.7x for the moon with my 300. The 1.7x works best with f/2.8 lensea for more general shooting. Your planned use would likely be fine.

---------- Post added 02-20-18 at 10:43 PM ----------

I forgot to mention that the M* is a good lens, but I've never seen any shoot out between it and the more modern optics.
02-20-2018, 09:17 PM   #6
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Don't forget that the DA*300 will autofocus without the teleconverter, and it's weather sealed. I guess it depends whether those things are important to you.

They are to me.
02-21-2018, 04:00 AM   #7
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QuoteOriginally posted by Sandy Hancock Quote
Don't forget that the DA*300 will autofocus without the teleconverter, and it's weather sealed. I guess it depends whether those things are important to you.

They are to me.
The f1.7is not weather sealed so weather sealing doesn’t matter also the f and fa autofocus as well.

Also I believe the f1.7 does the focusing. Not 100 % certain on this.
02-21-2018, 04:45 AM - 1 Like   #8
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QuoteOriginally posted by steve_k Quote
The f1.7is not weather sealed so weather sealing doesn’t matter also the f and fa autofocus as well.

Also I believe the f1.7 does the focusing. Not 100 % certain on this.
I am fully aware of all that; that's why I specified *without* the teleconverter. I can't imagine the chosen lens would only ever be used with it.

02-21-2018, 05:37 AM   #9
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I would veer towards a F or later lens: versus the M* I would think contrast will be better with the later coatings and also autofocus is available when not using the converter.
02-21-2018, 06:11 AM   #10
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I use it with the DA 300 and works very well. You have to adjust focus so it is close and then autofocus will take over


02-21-2018, 08:28 AM   #11
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You could pick up the plain M 300 (not *) in the marketplace for very little investment and verify if that route is a good fit. Then if not you haven't wasted much.

I saw this in the marketplace:
SMC Pentax 300mm f4 (final price drop) - PentaxForums.com

Edit: per reviews expect purple fringing in high contrast.
02-21-2018, 08:52 AM   #12
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For the 1.7 my only advice would be, the wider the aperture opens the better. I tend to use it only with ƒ2.8 lenses. That doesn't man you can't use it with slower aperture lenses, just that it works better with 2.8 lenses.
02-21-2018, 09:52 AM   #13
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Thanks everyone for your input, i appreciate your time
02-21-2018, 09:59 AM   #14
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QuoteOriginally posted by angelo9978 Quote
Thanks everyone for your input, i appreciate your time
Well thanks for saying thanks then...
02-21-2018, 10:03 AM   #15
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QuoteOriginally posted by angelo9978 Quote
I got the lens buying bug, and it unsurprisingly coincides with tax season

For those who have used the AFA 1.7x, which one do you think is a better buy per price/performance, or just performance in general; the DA 300mm for $896 or a good copy of pentax-M * 300mm f4 for $440? There was also a FA available for $711, but that seemed so close to the DA price and the DA has warranty and weather sealing, unless FA owners out there say the FA 300 f4.5 is stardust magic. I like to hike, but don't have a lot of bird photos, but I figure I will start focusing on birding if I pull the trigger on one of them.

Please help me with your input, Thanks!
DA* 300

It supposedly works just fine on full frame as well.
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