645 FA 400 mm f/5.6 test.

**RICHARD L.** · 07-10-2020, 08:34 AM

This morning, I figured the weights of :

1) a 645Z body + 67 M* 300 mm f/4 lens + 67 1.4X converter + 67 to 645 adapter = 3,85 Kg (8.5 pounds)

versus

2) a 645Z body + 645 FA 400 mm f/5.6 lens = 2,81 Kg (6.2 pounds).

**barondla** · 07-10-2020, 08:40 AM

Originally posted by RICHARD L.

This morning, I figured the weights of :

1) a 645Z body + a 67 M* 300 mm f/4 lens + a 67 1.4X converter + a 67 to 645 adapter = 3,85 Kg or 8.5 pounds

versus

2) a 645Z body + 645 FA 400 mm f/5.6 lens = 2,81 Kg or 6.2 pounds.

I'd have to already own the 67 lens/converter or it would have to optically outperform the 645 400. Not to mention giving up AF.

Thanks for doing the tests and math,
barondla

**RICHARD L.** · 07-13-2020, 10:20 AM - **1 Like**

Tripod-mounted 645 FA 400 mm f/5.6 + 645Z, 1/640 sec @ f/11. No flare and excellent sharpness.

---------- Post added 07-13-20 at 01:32 PM ----------

Extremely difficult backlit situation. Excellent rendering with the 645 FA 400 mm f/5.6, 1/1600 sec @ f/16.

The low tide exposes these brilliant reflective wet shoals.

**SteveinSLC** · 07-13-2020, 01:33 PM

I'd have a shot of the comet here to give an example of performance doing that....except at 4:00am in the dark, I didn't notice that the aperture ring on the lens had somehow been moved off the green A setting. And I couldn't figure out why I couldn't change the aperture. Argh. Given the tight time window, I gave up. Next time.

Nice shots of the St. Lawrence.

**RICHARD L.** · 07-18-2020, 04:21 AM - **1 Like**

This combination gives a 280 mm f/5.6 equivalent, easily replacing a 300 mm lens. Imaging quality remains very high with good sharpness, contrast and color saturation.
This combo remains quite light and can be used handheld as is the case here. I will try the FA 400 mm f/5.6 + 1.4X TC combination as soon as I can.

KiloHotelphoto · 07-18-2020, 07:11 AM - **1 Like**

I just ordered a 645Z last night and the 45-85mm. Still thinking between the the 400 or the 80-160mm seems to be some really good deals on both of these lenses.

moroccanimager · 09-13-2020, 09:39 AM

I get decent results with my 400 A but the FA looks great. The biggest problem for me is shutter speeds below 1/60 and image blur.

**RICHARD L.** · 09-13-2020, 12:07 PM - **1 Like**

The 645 FA 400 mm can be used on a K mount camera (with adapter) but you lose all automation. K1 mounted on the 645 FA 400 mm f/5.6 @ f/11.

**kaseki** · 09-13-2020, 02:34 PM

Originally posted by RICHARD L.

The 645 FA 400 mm can be used on a K mount camera (with adapter) but you lose all automation. K1 mounted on the 645 FA 400 mm f/5.6 @ f/11.

Nice! (As are all the others.)

moroccanimager · 09-14-2020, 01:24 AM

Great detail!

07-13-2020, 10:20 AM - 1 Like	#18
RICHARD L. Loyal Site Supporter Join Date: Oct 2018 Location: Quebec City, Quebec Posts: 6,577 Original Poster	Evening on the Saint Lawrence, CANADA. Pentax 645Z + 645 FA 400 mm f/5.6. Tripod-mounted 645 FA 400 mm f/5.6 + 645Z, 1/640 sec @ f/11. No flare and excellent sharpness. ---------- Post added 07-13-20 at 01:32 PM ---------- Extremely difficult backlit situation. Excellent rendering with the 645 FA 400 mm f/5.6, 1/1600 sec @ f/16. The low tide exposes these brilliant reflective wet shoals. Last edited by RICHARD L.; 07-13-2020 at 10:44 AM.

07-18-2020, 04:21 AM - 1 Like	#20
RICHARD L. Loyal Site Supporter Join Date: Oct 2018 Location: Quebec City, Quebec Posts: 6,577 Original Poster	Test with the FA 200 mm f/4 + 1.4X converter, 1600 ISO, 1/500 sec @ f/9. This combination gives a 280 mm f/5.6 equivalent, easily replacing a 300 mm lens. Imaging quality remains very high with good sharpness, contrast and color saturation. This combo remains quite light and can be used handheld as is the case here. I will try the FA 400 mm f/5.6 + 1.4X TC combination as soon as I can. Last edited by RICHARD L.; 07-18-2020 at 04:27 AM.

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07-10-2020, 08:34 AM	#16
RICHARD L. Loyal Site Supporter Join Date: Oct 2018 Location: Quebec City, Quebec Posts: 6,577 Original Poster	This morning, I figured the weights of : *1) a 645Z body + 67 M 300 mm f/4 lens + 67 1.4X converter + 67 to 645 adapter = 3,85 Kg (8.5 pounds) versus 2) a 645Z body + 645 FA 400 mm f/5.6 lens = 2,81 Kg (6.2 pounds).**

07-10-2020, 08:40 AM	#17
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,714	Originally posted by RICHARD L. This morning, I figured the weights of : *1) a 645Z body + a 67 M 300 mm f/4 lens + a 67 1.4X converter + a 67 to 645 adapter = 3,85 Kg or 8.5 pounds versus 2) a 645Z body + 645 FA 400 mm f/5.6 lens = 2,81 Kg or 6.2 pounds.** I'd have to already own the 67 lens/converter or it would have to optically outperform the 645 400. Not to mention giving up AF. Thanks for doing the tests and math, barondla

07-13-2020, 01:33 PM	#19
SteveinSLC Site Supporter Join Date: Mar 2017 Photos: Gallery \| Albums Posts: 568	I'd have a shot of the comet here to give an example of performance doing that....except at 4:00am in the dark, I didn't notice that the aperture ring on the lens had somehow been moved off the green A setting. And I couldn't figure out why I couldn't change the aperture. Argh. Given the tight time window, I gave up. Next time. Nice shots of the St. Lawrence.

07-18-2020, 07:11 AM - 1 Like	#21
KiloHotelphoto Pentaxian Join Date: Jan 2015 Location: Glen Mills, PA Photos: Albums Posts: 1,030	I just ordered a 645Z last night and the 45-85mm. Still thinking between the the 400 or the 80-160mm seems to be some really good deals on both of these lenses.

09-13-2020, 09:39 AM	#22
moroccanimager Junior Member Join Date: Jul 2016 Location: Morocco Posts: 47	I get decent results with my 400 A but the FA looks great. The biggest problem for me is shutter speeds below 1/60 and image blur.

09-13-2020, 12:07 PM - 1 Like	#23
RICHARD L. Loyal Site Supporter Join Date: Oct 2018 Location: Quebec City, Quebec Posts: 6,577 Original Poster	The 645 FA 400 mm can be used on a K mount camera (with adapter) but you lose all automation. K1 mounted on the 645 FA 400 mm f/5.6 @ f/11.

09-13-2020, 02:34 PM	#24
kaseki Loyal Site Supporter Join Date: Dec 2017 Photos: Gallery \| Albums Posts: 1,138	Originally posted by RICHARD L. The 645 FA 400 mm can be used on a K mount camera (with adapter) but you lose all automation. K1 mounted on the 645 FA 400 mm f/5.6 @ f/11. Nice! (As are all the others.)

09-14-2020, 01:24 AM	#25
moroccanimager Junior Member Join Date: Jul 2016 Location: Morocco Posts: 47	Great detail!