Comments made by johnriley - Page 1814

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If you go to My Settings and then Profile Information, you can enter your signature info there. Don't forget to save the changes.

If the problem persists after that, then a report is indeed the way to go.

Comment by johnriley posted on signature at 20/03/2009 - 13:03

Ah, I see. It's never actually been a problem, so I hope that reassures you. It doesn't even damage the coating on my Carl Zeiss Umbramatic lenses.

Comment by johnriley posted on A praise for the MX at 20/03/2009 - 12:24

Please remember this is a public forum. I have removed a post that I felt went too far.

Sellers can ask whatever price they want to, and buyers can either buy or decline to buy. Let's not get too excited about it.

Comment by johnriley posted on Pentax K 135mm f2.5 on eBay at 20/03/2009 - 10:12

Quote:
Warning if you wear glasses: the bare view-finder is not suitable for use with them.

Oh yes it is! It's what I've been using for the past, er, some years, and it's not a problem.

Why do you find it unsuitable?

Comment by johnriley posted on A praise for the MX at 20/03/2009 - 10:08

The best advice about cleaning mirrors is - don't. The whole mechanism can be put out of alignment very easily, after which all your images will be out of focus.

I would just take it back to the shop, get a refund and buy something else.

Comment by johnriley posted on . Advise needed. Cleaning the mirror at 20/03/2009 - 10:06

The thing is it's not the 50mm lens which is cropping the slide - it's that you aren't using all the field of view that it produces because of the APS-C sized sensor.

I think you might need a different sort of slide copier altogether for digital, but I haven't had the need to check it out yet.

Comment by johnriley posted on 100mm Macro and other bits on eBay at 20/03/2009 - 08:49

Quote:
By my calculations (which may well be wrong) 645 is 3 times better than 35mm and 67 is 5 times better than 35mm

By better I presume you mean larger. I've used various 645 cameras and the quality increase over 35mm is there, but it's not dramatic. The quality leap from 35mm to 67 is dramatic. It's a subjective assessment though based on printing black and white images in my darkroom.

Comment by johnriley posted on How good is these lenses? at 19/03/2009 - 23:57

The DSLR will always be better because of its larger sensor and better lenses.

Comment by johnriley posted on Pentax 18 - 250 or Fuji S100FS at 19/03/2009 - 15:41

Later enlarging lenses are coated, so my Nikkors would be superb close up lenses.

We reverse lenses to change the optimum distance from the nodal point to the image plane. Effectively enlarging lenses are already reversed compared to a camera lens, so that's why they are so good in these circumstances.

Comment by johnriley posted on 100mm Macro and other bits on eBay at 19/03/2009 - 14:35

The Componon IIRC is a 6 element lens of superior performance. The Tessar (a camera lens Tessar?) will be nowhere near as good.

Good enlarging lenses make much better macro lenses on bellows than general camera lenses do. That is beacause they are computed for the close distances involved.

Comment by johnriley posted on 100mm Macro and other bits on eBay at 19/03/2009 - 13:14

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