300mm v 150-450mm


Link Posted 03/07/2016 - 18:06
Hi, I don't wish to repeat what has been posted before but any advice would be welcome. I use a K-3.

I've read previous posts regarding the 300mm or the 150-450 and am in the same quandary myself at the moment. I've recently bought a 560mm and been very impressed with the excellent image quality & now thinking of adding one of the others for sports, aviation & wildlife. The 560 while great is just a bit too big & heavy for aviation for me.

I'm told that the image quality of the 300mm would be better than the 150-450 & it's lighter too which helps, but obviously being able to go up to 450mm would be better for the subjects I shoot. Yet am concerned about the extra weight when trying to use hand held and also if there is a reduction in image quality - provided I can hold it steady!

Many thanks


Link Posted 03/07/2016 - 18:45
Any way you can visit a dealer and compare them first hand?
John K
Last Edited by JAK on 03/07/2016 - 18:46


Link Posted 03/07/2016 - 18:56
For wildlife I use the 560mm and the 300mm. I used to use the Sigma 150-500. The only time that comes out now is at air shows. I have the 560mm on a tripod and handhold the 150-500. I find having the ability to zoom in and out a big advantage at airshows over the 300mm prime.



Link Posted 03/07/2016 - 19:22
I don't have a decent Pentax dealer near me so buy my kit from SRS.
Am going through my shots taken at Yeovilton using the Pentax 560mm and Sigma 50-500mm. 300mm images would be small 🤔


Link Posted 03/07/2016 - 19:47
the thing to think off as well is are you thinking of going

why dont you have a word with chris and see if he can do you a deal on ether of these lens if you hire them to try you never know you may get the hire price back for them both if you buy the lens
there is no harm in asking he can only say no


Link Posted 03/07/2016 - 20:15
Fwiw, I've a Sigma 100 - 300 F4 that I'd be willing to sell, it has suffered with the peeling paint that is usual with this lens, it comes with the original case, box and has been well looked after, open to a reasonable offer.

I can sort images of the lens if u are possibly interested.


" A Hangover is something that occupies the Head you neglected to use the night before".

K1 - Sigma 85mm F1.4, Pentax DFA 150 -450 F4.5 / 5.6, Pentax DFA* 24 - 70 F2.8

Samyang 14mm F2.8, Pentax DFA* 70-200 F2.8

K3iii + K3ii + K5iis converted to IR, Sigma 17 - 70 F2.8, Pentax 55 - 300 F4.5 / F5.6 PLM


Link Posted 03/07/2016 - 20:35
I have the DA* 300mm, a Sigma 100-300mm f4, FA* 250-600mm and a 150-450mm and am going to RIAT next weekend .... I am taking my K-5IIs and just the 150-450mm (well not just those as I will also take the 7D and Sigma 150-600mm sport).

I purchased the 150-450mm last year and took it to a few airshows then I posted my thoughts HERE along with a few pictures and have to say I think it is the perfect airshow lens ... I would imagine it's even better on the K-3 as you can crop even further with the extra megapixels and the AF is a tiny bit better.

Recommend the lens whole heartedly ...
. My Flickr



Link Posted 03/07/2016 - 20:37
Am in Plymouth so getting to SRS is a bit of a trek. I've thought about hiring them although it seems they don't hire out the 150-450.

Maybe I should keep my fingers crossed that Pentax will soon bring out a 400mm lens.


Link Posted 03/07/2016 - 20:41
Thanks for that Mike.
Yes, I would've thought the 150-450 would be an ideal range for aviation but do you find the weight an issue?
I know someone posted before on another thread that he found some images he'd taken at 450mm disappointing because they weren't sharp.


Link Posted 03/07/2016 - 20:55
London Camera Exchange in Plymouth is listed as a Pentax dealer, they might get the lenses in the store for you from their 'fulfilment centre'. Prices are a bit high though so maybe have to do some bargaining.
Last Edited by RobL on 03/07/2016 - 20:55



Link Posted 03/07/2016 - 21:04
Thanks for that. Yes I saw their prices were higher than SRS. Maybe I'll try that.
Having seen Mike P's images, the quality is certainly very good on the 150-450. The 2kg weight is an issue though if hand held.


Link Posted 03/07/2016 - 21:05
I don't find the weight an issue but then I am used to carrying this sort of lens around with me anyway ... I detest tripods so always shoot hand held (hence the reason my FA* 250-600mm has been out approximately 5 times in the years I have had it). Yes it would be nice if it were the same weight as the 300mm but you don't have the focal length (which is paramount at airshows ... and I imagine even more so since Shoreham) and just as importantly you don't have the zoom capability.

As for sharpness at 450mm, click on this and then click on the picture to zoom ... I defy anyone to tell me that isn't sharp at 450mm (remember, it's handheld as well). I think the clue might be in the sentence "some" images weren't sharp .. if you get some that are and some that aren't then the lens is obviously capable but the person using it isn't 100% of the time.
. My Flickr


Link Posted 03/07/2016 - 21:16
Yep that's sharp alright! Excellent set of images.
I thought my Sigma 50-500 was good until I started using the Pentax 560mm - the image is outstanding. But I was making people duck last week when I was using it!
I'd rather not use a tripod for aviation as find it restricting but it's ok with sports I find.


Link Posted 03/07/2016 - 21:28
I was always told if you can read the pilots name on the aircraft then the shot is sharp enough

Must admit I miss my Sigma 50-500mm OS though .. not quite as good as the 150-450mm but It was brilliant at close focusing and the 50-150mm capability was very handy at times. I have even toyed with the idea of buying another from SRS.

Another (non aircraft) pic at 450mm

Greenfinch by Mike.Pursey, on Flickr

And something the 50-500mm couldn't do with any degree of consistancy ... 150-450mm with the 1.4x on.

Little ringed plover by Mike.Pursey, on Flickr
. My Flickr



Link Posted 03/07/2016 - 21:35
Excellent images Mike and am impressed with the last one which had a converter on too.
Yes, I'd be more than happy if I can read the writing on the aircraft.
I have found I get a far higher % of sharp images with the Pentax lenses than the Sigma even though it has produced some that I'm really pleased with.
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